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Mustang II Disc Brake Rotor and Bearing-Seal Kit, 5 on 4-1/2 Inch
Mustang II Disc Brake Rotor and Bearing-Seal Kit, 5 on 4-1/2 Inch

Mustang II Disc Brake Rotor and Bearing-Seal Kit, 5 on 4-1/2 Inch

74-78 Ford Mustang II, 74-79 Ford Pinto, 75-79 Mercury Bobcat, Front Position, Steel, Natural

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Mustang II Disc Brake Rotor and Bearing-Seal Kit, 5 on 4-1/2 Inch
Mustang II Disc Brake Rotor and Bearing-Seal Kit, 5 on 4-1/2 Inch
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Part # 91603021
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  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.

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Rotor Shape:
Rotor Diameter:
9.25 Inch
Rotor Type:
Rotor Style:
Plain Face
Rotor Material Type:
Rotor Finish:
Rotor Thickness:
Bolt Pattern:
5 on 4.75"
Flange Diameter:
Stud Length:
Stud Diameter:
Sold in Quantity:


A fresh rebuild will help you roll down the road the way you intended! Our tech experts here at Speedway Motors found that sometimes you just need a good old fashioned rebuild kit with fresh wear parts. A kit of just bearings and rotors to replace those worn out braking components on your street rod or hot rod truck!

Kit Contains:

  • (2) Speedway Motors Mustang II Disc Brake Rotor
  • (1) Speedway Motors Bearing-Seal Kit

Speedway Motors Mustang II Disc Brake Rotor

Vented stock 9-1/4" diameter brake rotors for 1974-1980 Mustang II, Pinto, or Bobcat spindles (or Speedway brake kits using '49-'54 Chevy spindles). These five lug conversion brake rotors are new, not plugged or re-drilled. Has a 5 on 4-1/2" bolt pattern with corresponding 1/2" diameter fine thread wheel studs.

  • 5 on 4-1/2 Inch
  • Outside Diameter of rotor disc - 9.256"
  • Thickness of vented disc - .884"
  • I.D. of the back side of rotor - 6.256"
  • Rear rotor face to bearing hub - .290"
  • Outer hub diameter where wheel will mount - 5.834"
  • Outer hub height - 1.450"
  • Bearing snout is 1.60" tall, 2.55" diameter at bottom and 2.384" at outer end.

Speedway Motors Bearing-Seal Kit

This bearing and seal kit includes two inner wheel bearings, two outer wheel bearings, and two inner grease seals. This kit is enough for two brake rotors and is intended to be used with a new rotor installation as this kit does not include the bearing races or cups.

If your project will be making use of used rotors, you will require new bearing races or cups.  Therefore you will need to purchase the bearing and seal kit # 910-31052 suggested below in place of kit # 910-31000.

Works with Mustang II/Pinto and Granada rotors using Mustang II/Pinto spindles only. It will not work for installing Mustang II/Pinto brake rotors on 1949-1954 Chevy spindles. Not for use with early Chevy spindle brake conversion kits.

Includes (2) inner wheel bearings, (2) outer wheel bearings, and (2) inner grease seals. Enough for two brake rotors. No races or cups included.

-Large Bearing-
Thickness: .656"
Upper OD: 1.900"
Lower OD: 2.150"
Bearing ID: 1.375"

-Small Bearing-
Thickness: .651"
Upper OD: 1.380"
Lower OD: 1.570"
Bearing ID: 0.864"

Some parts are not legal for use in California or other states with similar laws/regulations

What's In The Kit

Each kit from Speedway Motors is carefully packaged and delivered right to your door. Below is a list of all the items you should expect to receive when you order this kit. Some of these items may also be available for sale individually if you're here looking for replacement parts.
  • Bearing-Seal Kit for Two Mustang II Brake Rotors
    Qty x 1
  • Mustang II Disc Brake Rotor, 5 on 4-1/2 Inch
    Qty x 2

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