Products to Compare (max of 3)
Compare These Parts
America's Oldest Speed Shop ® 800.979.0122 Lincoln, NE
Help Center
Help Center
Help Center

U.S.Order Line:


(CST) 7am - 10pm

Race and Rod Tech Support

Mon-Fri 8am - 5pm

Canadian Order Line:


International Order Line:

Since 1952

Wilwood 160-8343 Ultralite 32 Vane Vented Scalloped Rotor, 11.75 Inch

SAME DAY SHIPPING! Most orders ship within 24 hours.

Sold in Quantity:
Rotor Construction:
Rotor Diameter:
Rotor Hat Bolt Pattern:
8 x 7.00"
Material Type:
Cast Iron
Rotor Location:
Rotor Shape:
Vane Count:
32 V
Rotor Style:
Plain Face
MFG. Part #:
Garage Sale:
Inside Diameter:
Rotor Thickness:
Rotor Width:
Lug ID:
Wilwood 160-8343 Ultralite 32 Vane Vented Scalloped Rotor, 11.75 Inch
Wilwood 160-8343 Ultralite 32 Vane Vented Scalloped Rotor, 11.75 Inch
Wilwood 160-8343 Ultralite 32 Vane Vented Scalloped Rotor, 11.75 Inch

Click image to enlarge



Q & A

What's in the Box

When it comes to brake 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.

Note: Suitable for Light Dirt Racing applications. Scalloped Rotors are unsafe for street use.

Rotor Application Chart (GIF)



Proper Break-In Procedure for Steel or Cast Iron Rotors

New steel/iron rotors should be bedded in before being used in racing conditions. Proper bedding will prepare the rotor surface, prolong the rotor's life, and make it more resistant to thermal checking or cracking under severe braking conditions. The following procedures should be performed when bedding in both steel and cast iron rotors. It is best to bed in a new rotor using a used set of pads, preferably ones which will not create heat rapidly. Generating heat too rapidly will thermal shock the rotors. Likewise, when bedding in a new set of brake pads it is best to perform the process on a used rotor. This new/used bedding process permits controlled bedding of each individual component.

Make sure rotor surfaces are free from oils, grease, and brake fluid. Run vehicle up to a moderate speed and make several medium deceleration stops to heat up the rotor slowly. This will help reduce the chance of thermal shock caused by uneven heating of the rotor. Pull into the pits and allow the rotor to cool to ambient air temperature. Care should be taken not to ride the brakes into the pits as this may hot spot the rotor causing premature wear to the surface or structural damage. 


  • Scallop configuration provides greatest weight reduction on a vented straight vane iron rotor
  • Scallop machining removes as much as three pounds, or nearly 33% of the rotor mass
  • Vented castings provide increased cooling capacity over machined steel plate rotors
  • Improved structural durability over drilled rotor designs


  • Thickness: 1.25"
  • Outside diameter: 11.75"
  • # Holes: 8
  • Bolt Circle: 7"
  • Thread: Thru
  • Weight: 5.8 lbs

Customer Reviews

This product has no reviews.

Product Q&A

0 questions : 0 answers

No questions have been asked.

You may also be interested in:

Wilwood 170-0208 Rear Brake Drag Hat, 1.96 Inch Offset, Multi-5 Lug
(Part #8351700208)

Willwood brake hats have a long standing reputation for fit, performance, and durability. Manufactured from premium grade aluminum alloys offering high strength and low weight.

Wilwood Brake Hat Chart (Link)

Speedway Pro-Lite Vented Brake Rotor, 11.75 x 1.25 Inch
(Part #91031905)

Every brake rotor is cast from premium grade, long grain carbon iron which exhibits long wear, high thermal stability, and excellent resistance to distortion in high heat. Modern foundry and machining techniques hold close tolerances on face and vane thickness. Combining the correct face thickness with a 32 vane casting provides superior heat management and long service life with low rotating and unsprung weight. The straight vane design also makes it possible to use the same rotor on left or right hand mounting locations.

  • Thickness: GM 1.25"
  • Outside Diameter: 11.75"
  • # Holes: 8
  • Bolt Circle: 7"
  • Thread: Thru
  • Weight: 8.70 lbs

Pro-Lite Rotor Application Chart (GIF)

Speedway Cast Iron Scalloped Brake Rotor - 11.75 x 1.25 Inch
(Part #94031064)
                        Speedways premium 32 Vane scalloped cast iron brake rotors weigh only 6.36 lbs.

Item Details

1.25 x 11.75
8 x 7" B.C.
Speedway Cast Iron Drilled Scalloped Brake Rotor - 11.75 x 1.25
(Part #94031066)
                        Speedways premium 11.75" x 1.25" drilled & scalloped vented cast iron brake rotors weigh only 6.13 lbs.

Item Details

1.25 x 11.75
8 x 7" B.C.
AFCO 9850-6120 Straight Vane Brake Rotor, Drilled, 11.75 x 1.25 Inch
(Part #10698506120)

AFCOs disc brake rotors set the pace for design, quality and performance. Special designed materials, enhanced computer imagery and design, as well as extensive lab and track testing have yielded a superior brake rotor. All AFCO rotors have been optimized for strength, weight, and heat dissipation ability to meet the demands of the serious racer.

  • Premium grade alloys for superb thermal shock stability
  • Machined and blanchard ground to assure precise flatness
  • Precise vane placement for high volume cooling

Instructions (PDF)

Item Details

11.75" O.D.
1.25" Thick
# Hole: 8
7" Bolt Circle
Thread: Thru
2 Piece Aluminum Inboard Clamp
(Part #6261669)

Clamps to Winters axle. Made for easy install of a inboard break system.

  • 7" 8- rotor bolt pattern.
  • For use with old style Winters rear ends