Lightened Straight Vane Rotors:

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 and ULS - 32 scalloped iron rotors provide two highly effective lightweight options for sprints, dirt late models, modifieds, and other competition applications that race in low to medium temperature ranges.

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ULS - 32 Series Scalloped Rotors feature a fully machined scallop configuration that provides the highest degree of weight reduction on a vented straight vane iron rotor. Scallop machining will remove as much as three pounds, or nearly 33% of the rotor mass. The vented castings provide increased cooling capacity over machined steel plate rotors, with improved structural durability over drilled rotor designs.

Diameter

Width

Bolt Circle

Hole Type

Far Side I.D.

Lug I.D.

Weight LBS

Rotor
Type

Part
Number

12.19" (309,6)

.81" (20,6)

8 x 7.00" (177,8)

.325"

8.50" (215,9)

6.38" (162,0)

5.9

ULS-32

160-8136

11.75" (298,5)

1.25" (31,8)

8 x 7.00" (177,8)

.325"

8.34" (211,8)

6.38" (162,0)

5.8

ULS-32

160-8343

11.75" (298,5)

1.25" (31,8)

8 x 7.00" (177,8)

.325"

8.75" (222,2)

6.38" (162,0)

6.7

ULS-32

160-8814

11.75" (298,5)

.81" (20,6)

8 x 7.00" (177,8)

.325"

8.34" (211,8)

6.38" (162,0)

5.4

ULS- 32

160-8135

10.50" (266,7)

.75" (16,5)

6 x 5.50" (139,7)

.325"

7.30" (185,4)

4.94" (125,5)

5.2

ULS- 32

160-8427