Ultralite Rotors – Part No: 160-5864
Call (805) 388-1188
Ulltralite 32 Vane Rotor Drilled
Prod #: 160-5864
Price: $53.99

Ulltralite 32 Vane Rotor Drilled – Product Summary

Rotor Dimensions
Width (in) 1.25
Diameter (in) 11.75
Mount Side
Rotor Design
Material Iron
Vane Count 32 V
Weight(Lbs) 7.7
Rotor Style & Finish
Type ULD
Style Race Drilled
Surface Finish Plain
Rotor Upgrades
Bedded No
Balanced No
UPC Number
UPC 889545039818
160-5864 – Product Description

Ulltralite 32 Vane Rotor Drilled

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.

Performance Characteristics
• Race Drilled Rotors are unsafe for street use.
• Suitable applications: Light to moderate Dirt Racing

• Can result in failure if misused.

Vehicle Applications
Driving Environment Late Model Dirt
Vehicle Sub-Types STARS, UMP, IMCA, etc...
Application Duty Medium Duty
Driving Environment Northeast Modified
Vehicle Sub-Types Dirt or Pavement
Application Duty Light Duty
Driving Environment Open Wheel
Vehicle Sub-Types Sprint, Midget, etc… Dirt or Pavement
Application Duty Light Duty
Driving Environment Off Road
Vehicle Sub-Types
Application Duty Light Duty

Additional Rotor Dimensions

Rotor Bolt Circle (in) 8 x 7.00
Rotor Mount Hole Size (in) 0.326
Lug ID / Registration (in) 6.38
Far Side Inside Diameter (in) 8.34
Offset Dimension (in)

Shoe Inside Dimension (in)
Clearance Inside Diameter (in)
Wheel Bolt Circle (in
Stud Diameter (in)
Face Thickness (in)

Additional Notes

ULD-32 Series Drilled Straight Vane Vented Iron Rotors feature a two row, 64 hole pattern that alternates between and directly over each vane. Each hole is deeply chamfered to eliminate any stress points that could result in premature cracking at the drill holes. The drilling process removes an average of one pound from each rotor. Rotating and unsprung rotor mass is reduced by as much as 12%.

Caution on drilled rotors: There is a common mis-perception that rotors are drilled to improve cooling. The reduced mass of a drilled rotor will dissipate its retained heat quicker, but it also builds up heat a much faster rate. The decision to use drilled rotors should be solely based on the merits of the lower rotating and unsprung weight, and Nt for improved cooling. It is Nt wise to use drilled rotors in sustained high heat on hard braking tracks unless the team budget affords a high frequency of rotor and brake pad replacement.




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