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Founder, 1929-2014
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Speedway Cast Iron Drilled Scalloped Brake Rotor - 12.19 x .810

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Specs
Material Type:
Cast Iron
Weight:
5.56
Sold in Quantity:
Each
Finish:
Natural
Rotor Diameter:
12.19
MFG. Part #:
940-31062
Rotor Thickness:
0.81
Rotor Construction:
Vented
Rotor Hat Bolt Pattern:
8 x 7.00"
Garage Sale:
No
Rotor Location:
Rear
Rotor Shape:
Scalloped
Drilled:
Yes
Slotted:
No
Speedway Cast Iron Drilled Scalloped Brake Rotor - 12.19 x .810
Speedway Cast Iron Drilled Scalloped Brake Rotor - 12.19 x .810

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Details

Reviews

Q & A

What's in the Box

Speedway's premium 12.19" x .810" drilled & scalloped vented cast iron brake rotors weigh only 5.56 lbs.

Notes

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.

Specs

  • Vented iron 
  • Inboard mounted (Sprints)
  • Thickness: 0.81"
  • O.D.: 12.19"
  • Bolt Circle: 8 x 7"
  • Threads:  Thru
  • Weight: 5.56 lbs
  • Face: drilled & scalloped

Item Details

0.81 x 12.19
8 x 7" B.C.

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Racers are constantly searching for the ultimate balance between the lowest weight & 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 & other competition applications that race in low to medium temperature ranges.

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  • Threads:  Thru

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

Rotor Application Chart (GIF)

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Speedway Cast Iron Scalloped Brake Rotor - 12.19 x .81 Inch
(Part #94031060)
                        Speedway's premium 32 Vane scalloped cast iron brake rotors weigh only 6.13 lbs. 12.19" x .81", 8 on 7 thru.