Wilwood Rotor Guide
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Wilwood Disc Brakes produces over 120 different brake rotor diameters, widths, and styles for cars, trucks, motorcycles, and more. We have applications for classic and modern vehicles, for street use, road racing, circle track, off-road, and drag racing, from better than OEM stock replacement discs to the ultimate high-performance big brake kits. Our rotors come in standard, slotted, and drilled and slotted styles, with one-piece OEM style designs, lightweight aluminum hat mount, or full floating dynamically mounted systems. Most of our rotors are superior high friction thermally stable iron alloys for maximum performance even at high temperatures. We even offer exotic carbon-ceramic composite rotors for high-powered street cars, and aluminum or titanium for some Sprint Car and Midget racing applications. Rotors are ventilated to run cooler, with up to 72 straight or curved vanes for maximum cooling and forced airflow. Solid drag race rotors are designed to get you stopped at the end of the strip while taking off weight to help you get there faster.
For additional information or help with applications that you cannot find on our website, contact our technical experts at (805) 388-1188.

 
Wilwood GT Lug-Drive Dynamic Rotor Moutning System
Bolt-Free Lug-Drive Ring Mount System

Wilwood Spec37 GT Curved Vane Rotor
Spec37 Curved Vane Rotor Cross Section

Wilwood Glowing Hot Brake Rotor on Dyno
Wilwood Brake Pad & Rotor Dyno Testing

Wilwood Racing Rotors for Sprint and Midget Cars
Sprint/Midget Rotors in Titanium and Hard Ano Aluminum

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Wilwood's New TypeIII hard anodized Aluminum rotors are precision CNC machined from high strength billet plate. Full symmetrical machining provides perfect balance, perfect flatness, and the truest rotation of any rotor being built. These rotors fit the popular 3 x 5.00" mount bolt circle for sprint and midget front hubs along with a 42 tooth outboard for sprint cars.

Wilwood's engineered drill slot pattern along with the only TypeIII hard anodized aluminum rotor available combines the highest degree of weight reduction with the highest resistance to thermal distortion in the contact faces. You get smooth engagement and a consistent full pedal from the low knock-back characteristics of this design. The durable hard anodized finish improves performance and life over all other aluminum rotors on market. The best results are always achieved using PolyMatrix Q compound brake pads with these rotors.
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Wilwood's New TypeIII hard anodized Aluminum rotors are precision CNC machined from high strength billet plate. Full symmetrical machining provides perfect balance, perfect flatness, and the truest rotation of any rotor being built. These rotors fit the popular 3 x 5.00" mount bolt circle for sprint and midget front hubs along with a 42 tooth outboard for sprint cars.

Wilwood's engineered drill slot pattern along with the only typeIII hard anodized aluminum rotor available combines the highest degree of weight reduction with the highest resistance to thermal distortion in the contact faces. You get smooth engagement and a consistent full pedal from the low knock-back characteristics of this design. The durable hard anodized finish improves performance and life over all other aluminum rotors on market. The best results are always achieved using PolyMatrix Q compound brake pads with these rotors.
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GT 72 straight vane rotors provide high value performance and rugged durability for a wide range of competition, high performance, and sport driving applications. Don't confuse these rotors with bargain priced off-brand named parts. Wilwood's modern manufacturing capability, combined with large scale economies, make it possible to offer this level of quality and performance at such an affordable price.
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Wilwood''s ULGT-16 Curved Vane Spec-37 rotors are manufactured from a proprietary iron alloy developed to withstand extreme temperatures with the highest possible degree of resistance against distortion, warping, cracking, and wear. The formulation for this alloy is a derivative of technology and materials that were significant in the development of the extreme duty military spec rotors that are manufactured by Wilwood. Every Spec 37 rotor is precision machined to less than .001" run-out, flatness, and parallelism. Combined with our proven GT Style asymmetrical face slot pattern, you are assured the smoothest braking available.
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GT curved vane rotors are built for the extreme conditions of professional motorsports. The superior heat absorption and dissipation characteristics of these heavy wall directional vane rotors are the keys to preventing heat fade and realizing long service life from the rotors and pads. All rotors are cast from premium grade, long grain carbon iron for long wear, thermal stability, and resistance to distortion. Every GT rotor is fully detail machined to eliminate stress points and unnecessary weight away from the pad sweep face. The faces and O.D. are precision turned to less than .001" for flatness, parallelism, and run-out. An asymmetrical face slot pattern provides smoother engagement through reduced harmonics and improved thermal balance between the I.D. and O.D. of the rotor. Every rotor is then individually dynamic balanced to provide vibration free performance at any speed. These rotors provide the highest cooling capacity and longest service life for extreme braking short tracks and road course competition.
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GT-36 curved vane rotors are built for the extreme conditions of professional motorsports. The superior heat absorption and dissipation characteristics of these heavy wall directional vane rotors are the keys to preventing heat fade and realizing long service life from the rotors and pads. All rotors are cast from premium grade, long grain carbon iron for long wear, thermal stability, and resistance to distortion. Every GT rotor is fully detail machined to eliminate stress points and unnecessary weight away from the pad sweep face. The faces and O.D. are precision turned to less than .001" for flatness, parallelism, and run-out. An asymmetrical face slot pattern provides smoother engagement through reduced harmonics and improved thermal balance between the I.D. and O.D. of the rotor. Every rotor is then individually dynamic balanced to provide vibration free performance at any speed. These rotors provide the highest cooling capacity and longest service life for extreme braking short tracks and road course competition.
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GT-48 curved vane rotors are built for the extreme conditions of professional motorsports. The superior heat absorption and dissipation characteristics of these heavy wall directional vane rotors are the keys to preventing heat fade and realizing long service life from the rotors and pads. All rotors are cast from premium grade, long grain carbon iron for long wear, thermal stability, and resistance to distortion. Every GT rotor is fully detail machined to eliminate stress points and unnecessary weight away from the pad sweep face. The faces and O.D. are precision turned to less than .001" for flatness, parallelism, and run-out. An asymmetrical face slot pattern provides smoother engagement through reduced harmonics and improved thermal balance between the I.D. and O.D. of the rotor. Every rotor is then individually dynamic balanced to provide vibration free performance at any speed. These rotors provide the highest cooling capacity and longest service life for extreme braking short tracks and road course competition.
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GT-60 curved vane rotors are built for the extreme conditions of professional motorsports. The superior heat absorption and dissipation characteristics of these heavy wall directional vane rotors are the keys to preventing heat fade and realizing long service life from the rotors and pads. All rotors are cast from premium grade, long grain carbon iron for long wear, thermal stability, and resistance to distortion. Every GT rotor is fully detail machined to eliminate stress points and unnecessary weight away from the pad sweep face. The faces and O.D. are precision turned to less than .001" for flatness, parallelism, and run-out. An asymmetrical face slot pattern provides smoother engagement through reduced harmonics and improved thermal balance between the I.D. and O.D. of the rotor. Every rotor is then individually dynamic balanced to provide vibration free performance at any speed. These rotors provide the highest cooling capacity and longest service life for extreme braking short tracks and road course competition.
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GT-72 curved vane rotors are built for the extreme conditions of professional motorsports. The superior heat absorption and dissipation characteristics of these heavy wall directional vane rotors are the keys to preventing heat fade and realizing long service life from the rotors and pads. All rotors are cast from premium grade, long grain carbon iron for long wear, thermal stability, and resistance to distortion. Every GT rotor is fully detail machined to eliminate stress points and unnecessary weight away from the pad sweep face. The faces and O.D. are precision turned to less than .001" for flatness, parallelism, and run-out. An asymmetrical face slot pattern provides smoother engagement through reduced harmonics and improved thermal balance between the I.D. and O.D. of the rotor. Every rotor is then individually dynamic balanced to provide vibration free performance at any speed. These rotors provide the highest cooling capacity and longest service life for extreme braking short tracks and road course competition.
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HD-36 Series directional vane rotors provide superior thermal stability and long service for asphalt late models, modifieds, open wheel, and most other types of high heat competition applications. All HD rotors are cast from premium grade, long grain carbon iron for long wear, high thermal stability and resistance to distortion. Thick wall pad sweep faces with directional cooling vanes provide superior heat absorption and dissipation qualities to prevent heat fade and realize long service life from the pads and rotors. All HD rotor faces are precision turned to less than .001" for flatness, parallelism, and run-out for smoother engagement and reduced vibration.
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Wilwood''s ULHD-16 Curved Vane Spec-37 rotors are manufactured from a proprietary iron alloy developed to withstand extreme temperatures with the highest possible degree of resistance against distortion, warping, cracking, and wear. The formulation for this alloy is a derivative of technology and materials that were significant in the development of the extreme duty military spec rotors that are manufactured by Wilwood. Every Spec 37 rotor is precision machined to less than .001" run-out, flatness, and parallelism. Our HP Series preparation includes full detail machining and smooth pad contact faces without slots.
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HD-48 Series directional vane rotors provide superior thermal stability and long service for asphalt late models, modifieds, open wheel, and most other types of high heat competition applications. All HD rotors are cast from premium grade, long grain carbon iron for long wear, high thermal stability and resistance to distortion. Thick wall pad sweep faces with directional cooling vanes provide superior heat absorption and dissipation qualities to prevent heat fade and realize long service life from the pads and rotors. All HD rotor faces are precision turned to less than .001" for flatness, parallelism, and run-out for smoother engagement and reduced vibration.
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Wilwood's Satin, Mirrored & Black E-coat finished stainless rotors combine the ultimate in performance and distinctive style for production bikes and full customs using OE dimension brake components. A proprietary finishing processes on a select stainless alloy provides a appealing, high-tech finish, and the stopping power you expect from the world leader in high performance brake systems.
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Super Alloy Steel 10.50” x .16” Solid Rotors are one of Sprint racing's lightest rotor at a weight of only 1.40 pounds. Wilwood’s proprietary Super Alloy Steel greatly enhances the durability and lifespan of this rotor over comparable lightweight steel or aluminum rotors. A Drilled and scalloped design provides excellent high temperature stability, rapid heat dissipation, and consistent performance from the brake pads. The fine micro-finish surface beds quickly with new pads. It provides a cost effective, lightweight solution with quick response, long service life from the pads, and consistent braking at all temperatures.. Lowered rotating weight promotes quick acceleration, deceleration, and improved handling.
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Super Alloy 10.50” x .810” Vented Rotors are one of Sprint racing's lightest .810" rotor at a weight of only 2.40 to 3.20 pounds. Proprietary Super Alloy Titanium or Steel greatly enhances the durability and lifespan of this rotor over comparable lightweight steel or aluminum rotors. A Drilled, slotted, and scalloped design with 24 cooling vanes provides excellent high temperature stability, rapid heat dissipation, and consistent performance from the brake pads. The fine micro-finish surface beds quickly with new pads. It provides a cost effective, lightweight solution with quick response, long service life from the pads, and consistent braking at all temperatures.. Lowered rotating weight promotes quick acceleration, deceleration, and improved handling.
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Super Alloy Titanium 12.00” x .36” Slotted Rotors are Sprint racing's lightest .36" rotor at a weight of only 3.3 pounds. Wilwood’s proprietary Super Alloy Steel greatly enhances the durability and lifespan of this rotor over comparable lightweight steel or iron rotors. A directional slotted surface allowing for full pad contact. This provides excellent high temperature stability, with rapid heat dissipation and consistent performance from the brake pads. The fine micro-finish surface beds quickly with new pads. It provides a cost effective, lightweight solution with quick response, long service life from the pads, and consistent braking at all temperatures. Lowered rotating weight promotes quick acceleration, deceleration, and improved handling.
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For custom, show, and high performance sport driving, SRP rotors offer the high tech look and improved performance of a directional cross-drill and face slot pattern. In addition to the aesthetic appeal, the venting and cleaning action of the hole and slot pattern helps to reduce pad glaze and minimize irregular pad build-up on the rotor faces. The results are a smoother engagement feel at the pedal and consistent response from the pads. Each rotor is precision machined to less than .001" tolerance for overall flatness, parallelism, and radial run-out on long grain carbon iron castings. The rotors are finished with a black electro coat to provide corrosion resistance.
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SRP Drilled Performance Rotors feature a specially engineered directional cross drill and face slot pattern that improve brake response and pad performance throughout the entire range of light to heavy braking. The venting and cleaning action of the holes and slots will reduce pad glaze and disperse gasses and heat generated during the pad to rotor interface. The holes and slots also inhibit irregular pad compound build-up on the rotor faces resulting in smoother engagement and improved pedal response in all conditions. The material removed also contributes to lower rotating and unsprung suspension weight.
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Steel rotors have applications in all types of motorsports. Steel rotors provide a durable lightweight option in applications where sustained temperatures remain in the low to moderate range, and high heat spikes are only observed on an intermittent basis. This could be anything from a hard stopping drag race car at the end of a quarter mile, or a high speed stock car coming in from a qualifier at a super speedway. Steel rotors can also be found in lighter weight open wheel cars such as sprints and modifieds, and a variety of light weight, open wheel road course racers. A special alloy and proprietary manufacturing processes give these rotors high resistance to thermal distortion with excellent friction and wear characteristics against the pads.
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Steel rotors have applications in all types of motorsports. Steel rotors provide a durable lightweight option in applications where sustained temperatures remain in the low to moderate range, and high heat spikes are only observed on an intermittent basis. This could be anything from a hard stopping drag race car at the end of a quarter mile, or a high speed stock car coming in from a qualifier at a super speedway. Steel rotors can also be found in lighter weight open wheel cars such as sprints and modifieds, and a variety of light weight, open wheel road course racers. A special alloy and proprietary manufacturing processes give these rotors high resistance to thermal distortion with excellent friction and wear characteristics against the pads.
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Steel rotors have applications in all types of motorsports. Steel rotors provide a durable lightweight option in applications where sustained temperatures remain in the low to moderate range, and high heat spikes are only observed on an intermittent basis. This could be anything from a hard stopping drag race car at the end of a quarter mile, or a high speed stock car coming in from a qualifier at a super speedway. Steel rotors can also be found in lighter weight open wheel cars such as sprints and modifieds, and a variety of light weight, open wheel road course racers. A special alloy and proprietary manufacturing processes give these rotors high resistance to thermal distortion with excellent friction and wear characteristics against the pads.
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HP rotors are close tolerance machined with smooth turned pad faces. The additional mass of the HP series extends service life on heavier competition vehicles and other severe duty applications. They are also the base model for every day use.
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When it comes to rotors, racers are constantly searching for the ultimate balance between the lowest weight and the ability to effectively manage heat. Decreased rotating weight in the drive line provides quicker deceleration under braking and quicker acceleration out of the corners. Lower weight also benefits handling with improved spring and shock control over the unsprung suspension mass. Wilwood's ULS-32 scalloped iron rotors provides effective lightweight options for sprints, late models, modifieds, and other competition applications that race in low to medium temperature ranges.
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Ultra-Light ULHP straight vane rotors provide high value performance and rugged durability for a wide range of competition, high performance, and sport driving applications. Do not confuse these rotors with bargain priced off-brand named parts. Wilwoods modern manufacturing capability, combined with large scale economics, make it possible to offer this level of quality and performance at such an affordable price.
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Wilwoods Scalloped Steel 3 hole mount rotors are precision machined from special alloy. Proprietary manufacturing processes give these rotors high resistance to thermal distortion with excellent friction and wear characteristics against the pads. These rotors fit the popular 3 x 5.00" mount bolt circle on sprint and midget front hubs.
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Ultra-Light ULHP straight vane rotors provide high value performance and rugged durability for a wide range of competition, high performance, and sport driving applications. Don't confuse these rotors with bargain priced off-brand named parts. Wilwood's modern manufacturing capability, combined with large scale ecoNmies, make it possible to offer this level of quality and performance at such an affordable price.
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When it comes to rotors, racers are constantly searching for the ultimate balance between the lowest weight and the ability to effectively manage heat. Decreased rotating weight in the drive line provides quicker deceleration under braking and quicker acceleration out of the corners. Lower weight also benefits handling with improved spring and shock control over the unsprung suspension mass. Wilwood's ULD-32 drilled iron rotors provides effective lightweight options for sprints, late models, modifieds, and other competition applications that race in low to medium temperature ranges.
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Ultra-Light ULHP-32 straight vane rotors provide an excellent balance of efficient cooling and lower rotating mass on hard braking dirt tracks or rear axle service on pavement cars. UL rotors are cast from premium grade, long grain carbon iron for long wear, high thermal stability, and resistance to distortion. ULHP-32 rotors offered the added performance and smoother operation of precision turned faces with less than .001" variation in flatness, parallelism, or run-out.
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When it comes to rotors, racers are constantly searching for the ultimate balance between the lowest weight and the ability to effectively manage heat. Decreased rotating weight in the drive line provides quicker deceleration under braking and quicker acceleration out of the corners. Lower weight also benefits handling with improved spring and shock control over the unsprung suspension mass. Wilwood's ULS-32 scalloped iron rotors provides effective lightweight options for sprints, late models, modifieds, and other competition applications that race in low to medium temperature ranges.
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Ultra-Light UL straight vane rotors provide high value performance and rugged durability for a wide range of competition, high performance, and sport driving applications. Don't confuse these rotors with bargain priced off-brand named parts. Wilwood's modern manufacturing capability, combined with large scale ecoNmies, make it possible to offer this level of quality and performance at such an affordable price.
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Ultra-Light UL straight vane rotors provide high value performance and rugged durability for a wide range of competition, high performance, and sport driving applications. Don't confuse these rotors with bargain priced off-brand named parts. Wilwood's modern manufacturing capability, combined with large scale ecoNmies, make it possible to offer this level of quality and performance at such an affordable price.
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Ultra-Light ULHP straight vane rotors provide high value performance and rugged durability for a wide range of competition, high performance, and sport driving applications. Don't confuse these rotors with bargain priced off-brand named parts. Wilwood's modern manufacturing capability, combined with large scale ecoNmies, make it possible to offer this level of quality and performance at such an affordable price.
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HPS rotors are close tolerance machined with turned grooved pad faces. The additional mass of the HP series extends service life on heavier competition vehicles and other severe duty applications. They are also the base model for every day use.
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HP rotors are close tolerance machined with smooth turned pad faces. The additional mass of the HP series extends service life on heavier competition vehicles and other severe duty applications. They are also the base model for every day use.
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Ultra-Light UL-32 directional vane rotors provide an excellent balance of efficient cooling and lower rotating mass on hard braking dirt tracks or rear axle service on pavement cars. UL rotors are cast from premium grade, long grain carbon iron for long wear, high thermal stability, and resistance to distortion. UL-32 rotors are production machined and well suited to a wide range of sportsman racing categories.
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The Wilwood Sprocket Brake Rotor and Brake System provides four-piston stopping power with Wilwood performance and classic styling you expect. Multiple mounting options include both left or right side. The Sprocket Brake fits custom applications with 1" axles.
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Wilwood’s GM OEM Replacement Racing Rotors for Modifieds: These rotors were designed utilizing the latest developments in iron formulation technology using our proprietary blend ferrous alloy to bring you the strongest, lightweight, most dependable rotor available in the market place. The rotors are new castings, not reworked parts and our tolerances are held to the high standards you have come to expect from Wilwood Engineering. Rotors are offered in two configurations - GM Metric and Ford Hybrid and come standard with races and 5/8” coarse wheel studs installed in the 5 on 5 bolt pattern. The GM Metric rotor is 10.50” diameter by 1.00” thick and fits the 1979-1988 GM spindles. The Ford Hybrid version is 10.15” diameter by .810” thick rotor that fits the 1974-1980 Pinto spindles.
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Wilwood’s OEM style hub and rotor assemblies. These rotors were designed utilizing the latest developments in iron formulation technology using our proprietary blend ferrous alloy to bring you the strongest, lightweight, most dependable rotor available in the market place. The rotors are new castings, not reworked parts and our tolerances are held to the high standards you have come to expect from Wilwood Engineering. Designed as a cost effective alternative to our standard three piece hub and rotor assemblies, it also lends further utility kit designs.
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Wilwood's C/SiC rotors are made form a proprietary blend ceramic matrix composite material commonly known as Carbon-Ceramic. C/SiC rotors offer higher thermal conductivity and heat capacity in excess of conventional iron or titanium rotors of similar or even greater weight. Developed to withstand extreme temperatures with the highest possible degree of resistance against distortion, warping, cracking, and wear. The formulation for this composite is a derivative of technology and materials that were significant in the development of the extreme duty military spec rotors that are manufactured by Wilwood.
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Wilwood’s OEM style SRP hub and rotor assemblies were designed utilizing the latest developments in iron formulation technology using our proprietary blend ferrous alloy to bring you the strongest, lightweight, most dependable rotor available in the market place. SRP rotors offer the high tech look and improved performance of a directional cross-drill and face slot pattern.The rotors are finished with a black electro coat to provide corrosion resistance.These rotors are new castings, not reworked parts and our tolerances are held to the high standards you have come to expect from Wilwood Engineering. Designed as a cost effective alternative to our standard three piece hub and rotor assemblies, it also lends further utility kit designs.
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Wilwood’s GT Rotor and Lug Drive Hat Assemblies are preassembled packages of our latest and greatest technology and design. The lug-drive rotor mounting system eliminates the rotor bolts and instead, a large single internal snap-ring retains the rotor in the hat. This system allows the rotors to move independently of the hats as they expand and contract through heat cycles. All thermally generated stress is removed from the rotor attachment points. The rotors stay flatter and run truer. Paired with GT 72 Curved Vane Spec-37 rotors that are manufactured from a proprietary iron alloy developed to withstand extreme temperatures with the highest possible degree of resistance against distortion, warping, cracking, and wear.
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Wilwood’s SRP Rotor and Lug Drive Hat Assemblies are preassembled packages of our latest and greatest technology and design. The lug-drive rotor mounting system eliminates the rotor bolts and instead, a large single internal snap-ring retains the rotor in the hat. This system allows the rotors to move independently of the hats as they expand and contract through heat cycles. All thermally generated stress is removed from the rotor attachment points. The rotors stay flatter and run truer. Paired with SRP Drilled Performance rotors that are manufactured from a proprietary iron alloy developed to withstand extreme temperatures with the highest possible degree of resistance against distortion, warping, cracking, and wear.
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Wilwood’s C/SiC Rotor and Lug Drive Hat Assemblies are preassembled packages of our latest and greatest technology and design. The lug-drive rotor mounting system eliminates the rotor bolts and instead, a large single internal snap-ring retains the rotor in the hat. This system allows the rotors to move independently of the hats as they expand and contract through heat cycles. All thermally generated stress is removed from the rotor attachment points. The rotors stay flatter and run truer. Paired with C/SiC rotors that are made form a proprietary blend ceramic matrix composite material commonly known as Carbon-Ceramic. C/SiC rotors offer higher thermal conductivity and heat capacity in excess of conventional iron or titanium rotors of similar or even greater weight.
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Wilwood's Lug Drive Hat-to-Rotor Ring System is Setting the Standard in Motorsports



 
 

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Version: 3.03 April 28, 2022
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