Product Summary

Universal Fit, Rear Position, 11.75 Inch Rotor Diameter

  • Replace those old drum rear brakes with modern disc brakes using this universal weld on disc brake kit
  • Features reinforced weld on brake brackets for use with GM Metric brake calipers
  • 11.75" OD vented rotors which are .81" thick ensure cool operation for fade free braking performance
  • This basic kit includes rotors, brake hats, and caliper brackets to allow you to choose your own calipers
  • The 1.59" offset CNC machined aluminum brake hat accommodates 5 on 4-1/2, 4-3/4", and 5 on 5" bolt circles

Comes as a Kit

Key Specs

MFG. Part #91031915
BrandSpeedway Motors
Rotor Diameter11.75 Inch
Rotor TypeVented

Need To Know

This Product Will Ship Free

Shipping Policies & FAQs

Quick and Easy Returns

Return Policy


Replace those old drum brakes with modern rear disc brakes. Included steel caliper brackets weld to your 3" tube rearend, making this a universal kit for a variety of applications. Basic kit includes caliper brackets for '78-'88 GM metric car front calipers, Pro-lite vented .810" x 11-3/4" iron rotors, aluminum brake hats (1.59" backspace), and rotor bolts.

Hat fits 5 on 4-1/2", 5 on 4-3/4" and 5 on 5" bolt circles.



MFG. Part #91031915
BrandSpeedway Motors
Rotor Diameter11.75 Inch
Rotor TypeVented
Bolt PatternMulti: 5 on 4.5" | 4.75" | 5"
Parking Brake ProvisionNo
Rotor Hat Bolt Pattern8 x 7.00"
Rotor Thickness.81"
Rotor ShapeRound
Rotor I.D.3.06"
Rotor Backspace1.59"
Thread Pitch7/16"-20
Hardware IncludedYes
Sold in QuantityKit
NotesFor 3" rear end tube. Includes rotors, rotor hats, rotor bolts, and caliper brackets.
Rotor Material TypeCast Iron
Front Rotor IncludedNo
Rear Rotor IncludedYes
Front Caliper IncludedNo
Rear Caliper IncludedNo
Front Spindles IncludedNo
Master Cylinder IncludedNo
Brake Booster IncludedNo