Complete Front Brake Kit: Includes two Speedway Motors Mustang II disc brake rotors and one bearing-seal kit to service both front wheels, Vented Rotor Design: Stock-style vented 9-1/4-inch rotors improve heat dissipation and are designed for 1974–1980 Mustang II, Pinto, and Bobcat spindles, 5-Lug Bolt Pattern: Features a 5 on 4-1/2-inch bolt pattern with pre-installed 1/2-inch fine-thread wheel studs for easy wheel installation, Bearing & Seal Package: Bearing kit includes two inner bearings, two outer bearings, and two inner grease seals for a complete rotor install, New Replacement Components: Ideal for fresh rebuilds using new rotors; bearing races are already installed in the rotors for straightforward assembly
Mustang II Disc Brake Rotor and Bearing-Seal Kit, 5 on 4-1/2 Inch Speedway Motors
Mustang II Disc Brake Rotor and Bearing-Seal Kit, 5 on 4-1/2 Inch
Sku # 91603021
Mfr. Part # 91603021
Condition
New
Brand
Speedway Motors
Sold
Each
Details

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 bearingstwo 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 bearing and seal kit kit does not include the bearing races or cups.   Bearing races or cups are provided as installed and included inside the new rotors as part of this rotor and new bearing and seal kit.

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"

Specs
Position
Front
Rotor Shape
Round
Rotor Diameter
9.25 Inch
Rotor Type
Vented
Rotor Style
Plain Face
Rotor Material Type
Steel
Rotor Finish
Plain
Rotor Thickness
0.884"
Bolt Pattern
5 on 4.5"
Flange Diameter
5.75"
Stud Length
1.25"
Stud Diameter
0.5"
MFG. Part #
91603021
Sold in Quantity
Kit
Reviews

Yes

Rated
Product Rating
by Denny on March 29, 2026

Summary: They was used on the front of my 40 ford pu

Yes, I recommend this product.

Product was a great fit and as advertized

Rated
Product Rating
by AVPir8 on July 13, 2025

Summary: Worked out well and did not take long to swap out!

Yes, I recommend this product.

Yes and would recommend Speedeway to anyone.

Rated
Product Rating
by Sid on April 27, 2025

Summary: Excellent quality for the price

Yes, I recommend this product.

I would buy again

Rated
Product Rating
by Royal on January 13, 2025

Summary: I used this on our 1952 XK120 Jaguar Roadster. Great product

Yes, I recommend this product.

perfect and what I was looking for

Rated
Product Rating
by Vince V on September 15, 2024

Summary: Need a set of 5 lug Mustang II rotor/hubs for a big brake setup I'm working on designing. I only bought them to use the center hub section But they were good quality parts the way they were.

Yes, I recommend this product.

Tech Support
We're here to help before and after your purchase. If you have a question or need assistance with one of our products, please contact us through eBay Messaging and a knowledgeable Speedway Motors team member will be happy to help.
About
Speedway Motors is America’s Oldest Speed Shop® and has been a trusted source for specialty rodding and racing products and friendly expert advice for more than 74 years. Founded in 1952 by “Speedy” Bill Smith – a racer and street rodder himself – Speedway has grown from a one-man operation to become the world’s largest manufacturer, distributor and retailer of street rod and racing products. Our industry-leading fast delivery is the result of same-day shipping from our state-of-the-art, centrally located 500,000 sq. ft. headquarters. Speedway’s size offers customers unmatched product selection and low pricing, while our excellent technical support and customer service have made us a recognized leader in the rodding and racing industries.