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Speedway Cast Iron Drilled Scalloped Brake Rotor, 11.75 x .810 Inch

Specs
Material Type:
Cast Iron
Weight:
5.07
Sold in Quantity:
Each
Finish:
Natural
Rotor Diameter:
11.75
MFG. Part #:
940-31068
Rotor Thickness:
0.81
Rotor Construction:
Solid
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, 11.75 x .810 Inch
Speedway Cast Iron Drilled Scalloped Brake Rotor, 11.75 x .810 Inch

Click image to enlarge

Details

Reviews

Q & A

What's in the Box

These scalloped iron brake rotors provide effective lightweight options for sprints, late models, modifieds, and other competition applications that race in low to medium temperature ranges. Steel rotors are typically found in lighter weight open wheel cars such as sprints and modifieds.  Speedway's premium 11.75" x .810" drilled scalloped brake rotor weighs only 5.07 lbs.

  • 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
  • Vented iron 
  • Inboard mounted (Sprints)

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


 

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

  • Thickness: 0.81"
  • O.D.: 11.75"
  • Bolt Circle: 8 x 7"
  • Threads:  Thru
  • Weight: 5.07 lbs
  • Face: drilled & scalloped

Item Details

.810 x 11.75
8 x 7" B.C.

You may also be interested in:

Wilwood 160-8136 Ultralite 32 Vane Vented Scalloped Iron Rotor, 12.19
(Part #8351608136)
                        

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.

  • 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
  • Vented iron
  • Inboard mounted
  • Threads:  Thru

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

Rotor Application Chart (GIF)

DMI SRC-2932 Lightweight Inboard Brake Clamp
(Part #9402932)
                        This inboard brake clamp is super lightweight and strong. Designed for 8-bolt floating rotors. 1.5 lbs.
                    
Wilwood 160-8135 Ultralite 32 Vane Vented Scalloped Iron Rotor, 11.75
(Part #8351608135)
                        

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 Brake Rotors are unsafe for street use.

  • 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
  • Thread: Thru

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.

 

Garage Sale - Sprint Brake Hub & Bolt Kit - 8 on 7 Inch Bolt Pattern
(Part #94031041)
                        
  • For the 10.400" rotor
  • 8" bolt, 7" bolt circle
  • Weighs 15 oz.
  • Bolt to inboard rotor with treated titanium bolts and 12 point nuts
 
 

This is garage sale priced because it has been discontinued.

 

NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS  
Speedway Cast Iron Scalloped Brake Rotor, 11.75 x .810 Inch
(Part #94031065)
                        

Speedway's premium 32 Vane scalloped cast iron brake rotors weigh only 5.58 lbs.

  • Vented iron 
  • Bolt Circle: 8 x 7"
  • Threads:  Thru
  • Face: scalloped