Product Summary

Round Rotor Shape, 9.25 Inch Rotor Diameter, Cast Iron

  • Complete front brake rotor service kit for Mustang II applications
  • Includes two brake rotors with GM 5 on 4-3/4-inch bolt pattern
  • Bearing and seal kit services both included rotors
  • Ideal for street rods, hot rods, muscle cars, and custom builds
  • Convenient all-in-one package simplifies brake maintenance and repairs

Comes as a Kit

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Key Specs

Rotor Diameter9.25 Inch
Rotor StylePlain Face
Rotor Material TypeCast Iron
Rotor Thickness0.88
Bolt Pattern5 on 4.75"
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Speedway Motors 91031020 Details

Restore your Mustang II front disc brake system with this complete rotor and bearing service package. Kit #91031010 includes two Mustang II brake rotors featuring the popular GM 5 on 4-3/4-inch wheel bolt pattern, along with a bearing and seal kit designed to service both rotors. By combining all the essential wear components in one package, this kit simplifies brake maintenance and front-end repairs.

Ideal for street rods, hot rods, muscle car builds, and custom chassis applications equipped with Mustang II-style front suspensions, this kit helps ensure smooth wheel rotation, proper bearing support, and dependable braking performance. The included bearings and seals are matched to the rotors for straightforward installation and long-lasting service.

  • Complete front brake rotor service kit for Mustang II applications
  • Includes two brake rotors with GM 5 on 4-3/4-inch bolt pattern
  • Bearing and seal kit services both included rotors
  • Ideal for street rods, hot rods, muscle cars, and custom builds
  • Convenient all-in-one package simplifies brake maintenance and repairs

Speedway Motors 91031020 Specifications

KEY SPECS
MFG. Part #91031020
BrandSpeedway Motors
Rotor Diameter9.25 Inch
Rotor StylePlain Face
Rotor Material TypeCast Iron
Rotor Thickness0.88
Bolt Pattern5 on 4.75"
GENERAL
Rotor ShapeRound
Rotor TypeVented
Rotor FinishPlain
Flange Diameter5.74
Stud Length0.93
Stud Diameter0.44
Thread Pitch7/16"-20
Weight14.60
Sold in QuantityKit
NotesFits Mustang II/Pinto/Bobcat spindles. Replacement bearing cups for OEM: 912TLM12710 (cup, outer), 912TL68110 (cup, inner), Knurl dia. 0.475".

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