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 '69-'77 GM calipers with massive 2.75" piston size to provide incredible stopping power
  • 11.75" OD vented rotors which are .81" thick ensure cool operation for fade free braking performance
  • This complete kit includes calipers, rotors, brake pads, brake hats, caliper slide bolts, and caliper brackets
  • The 1.96" 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 #91031935
BrandSpeedway Motors
Rotor Diameter11.75 Inch
Rotor TypeVented

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Replace those old drum brakes with modern rear disc brakes. Mounts .81" x 11-3/4" Pro-lite vented iron rotors and calipers to 3" tube rear end.  Complete with rotors, hats, calipers (7/16"-20 inlets), brackets, brake pads, caliper brackets and slider bolts. 

Wilwood aluminum hats fits 5 lug hubs with 4-1/2", 4-3/4", or 5" bolt circle.



  • Caliper Brackets (2)
    • Weld onto a 3" axle tube
  • Rotors (2)
    • GM-style .81" x 11-3/4", 8 on 7" bolt pattern
    • Straight vanes, 8 lbs. each
  • Rotor Hats (2)
    • Machined aluminum, 1.96" offset
    • 3.06" center hole, 6-3/8 I.D., 1/2" stud holes, 1.6 lbs.
  • Rotor Bolt and Nut Kit (2)
  • Caliper Slider Bolts (4)
  • Brake Pads (2 sets)
    • Street compound, little metallic, long rotor and pad life
  • Calipers - 1969-77 GM Midsize (L & R)
    • 7/16"-20 inlet
    • Cast iron body, 2.8" single piston


MFG. Part #91031935
BrandSpeedway Motors
Rotor Diameter11.75 Inch
Rotor TypeVented
Bolt PatternMulti: 5 on 4.5" | 4.75" | 5"
Caliper PistonsOne
Caliper FinishNatural
Parking Brake ProvisionNo
Rotor Hat Bolt Pattern8 x 7.00"
Rotor Thickness.81"
Rotor ShapeRound
Rotor Backspace1.96"
Thread Pitch7/16"-20
Centerline of Holes7.00"
Hardware IncludedYes
Sold in QuantityKit
NotesIncludes rotors, rotor hats, caliper brackets, calipers, pads, and hardware.
Rotor Material TypeCast Iron
Front Rotor IncludedNo
Rear Rotor IncludedYes
Front Caliper IncludedNo
Rear Caliper IncludedYes
Front Spindles IncludedNo
Master Cylinder IncludedNo
Brake Booster IncludedNo