Product Summary

Front Position, Round Rotor Shape, Vented Rotor Type

  • These 11" brake rotors come with 5/8" coarse threads installed making them perfect for dirt circle track cars
  • Fit 1973 to 77 GM midsize cars as well as 1970 to 81 Camaro and 1980 and up Impala as long as the correct bearing kit is used
  • 5 on 5" bolt pattern is used on these rotors which is popular for circle track cars
  • Premium castings and vented design ensure fade free performance and long rotor life
  • Not suggested for ashpalt race cars due to the high stress placed on the hub in that application - billet hubs are recommended for asphalt cars

Key Specs

Rotor ShapeRound
Rotor Diameter11 Inch
Rotor TypeVented
Rotor StylePlain Face

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Speedway Motors 91031064 Details

1973-1977 GM mid sized front brake rotor. 5 on 5" with 5/8" coarse studs installed. 11" diameter x 1".  IMCA Approved.

This rotor is designed for dirt track applications and should NOT be used for asphalt racing.

Use bearing/seal kit # 910-31042 when using this rotor on the 1973-77 Chevelle type spindle.

Use bearing/seal kit # 910-31880 when using this rotor on the 0.844" outer Camaro or 1980-up Impala type spindle.

Item Details

23.5 lbs.


This rotor fits the following spindles:

  • 1973-1977 Buick Century, Regal
  • 1975-1978 Buick Skylark
  • 1970-1978 Chevy Camaro
  • 1977-1978 Chevy Full size
  • 1973-1977 Chevy Malibu, Monte Carlo
  • 1975-1978 Chevy Nova
  • 1973-1977 Oldsmobile Cutlass
  • 1970-1978 Pontiac Firebird
  • 1973-1977 Pontiac Grand Prix, LeMans GTO
  • 1975-1978 Pontiac Ventura, Phoenix


This rotor uses the following bearings and seals:

  • Outer Bearing Cone 912TLM11949
  • Cup 912TLM11910
  • Inner Bearing Assembly 912TS6
  • Inner Seal 912S19753

Speedway Motors 91031064 Specifications

MFG. Part #91031064
BrandSpeedway Motors
Rotor ShapeRound
Rotor Diameter11 Inch
Rotor TypeVented
Rotor StylePlain Face
Rotor Material TypeCast Iron
Rotor FinishNatural
Rotor Thickness1"
Bolt Pattern5 on 5"
Stud Length2.25"
Stud Diameter0.63"
Thread Pitch5/8"-11
Weight23.5 lbs.
Sold in QuantityEach