Product Summary

Front Position, 5 on 4.5" Bolt Pattern, Natural

  • Upgrade your Mustang II from the stock 9 1/4" rotors to 11" rotors with powerful single piston floating caliper
  • Simple bolt-on conversion includes instructions & requires NO machining
  • For use on '74-'80 Pinto or Bobcat and '74-'78 Mustang II spindles
  • Complete kit includes new rotors, calipers, rubber brake hoses, brackets, bearings, seals, pads and hardware
  • Features Ford 5 x 4 1/2" bolt pattern with 1/2" wheel studs

Comes as a Kit

Key Specs

Bolt Pattern5 on 4.5"
Rotor Diameter11 Inch
Rotor TypeVented
Caliper PistonsOne

Need To Know

This Product Will Ship Free

Shipping Policies & FAQs

Quick and Easy Returns

Return Policy

Speedway Motors 91031944 Details

Upgrade your Mustang II based suspension from the stock 9-1/4" rotors to our 11" rotors with powerful single piston GM metric floating calipers. This simple bolt-on conversion requires no machining. For use on 1974-80 Pinto, Bobcat and Mustang II spindles.

Features a 5 on 4-1/2" Ford/Mopar wheel bolt pattern (increases track width 1/2" per side). Includes two 16" front brake hoses and 7/16"-20 banjo bolts with crush washers.

Note:  14" wheels will require clearance to be checked as not all 14" wheels will clear caliper


Speedway Motors 91031944 Specifications

MFG. Part #91031944
BrandSpeedway Motors
Bolt Pattern5 on 4.5"
Rotor Diameter11 Inch
Rotor TypeVented
Caliper PistonsOne
Caliper FinishNatural
Parking Brake ProvisionNo
Rotor ShapeRound
Hardware IncludedYes
Front Rotor IncludedYes
Front Rotor Diameter11 Inch
Front Caliper IncludedYes
Front Caliper Piston Quantity1
Front Caliper FinishNatural
Rear Caliper IncludedNo
Front Spindles IncludedNo
Master Cylinder IncludedNo
Brake Booster IncludedNo
Rear Rotor IncludedNo
Rotor Thickness.88"
Stud Diameter.50"
Stud Length1.29"
Thread Pitch1/2"-20
Centerline of Holes5.50"
Sold in QuantityKit
NotesIncludes rotors, bearings and seals, calipers, pads, brake hoses, brake tabs, and caliper brackets.
Rotor Material TypeCast Iron