Product Summary

Front Position, Round Rotor Shape, Vented Rotor Type

  • Includes (2) Speedway Motors Mustang II Disc Brake Rotor & (1) Speedway Motors Bearing-Seal Kit
  • Vented stock 9-1/4" diameter brake rotors for 1974-1980 Mustang II, Pinto, or Bobcat spindles
  • Has a 5 on 4-1/2" bolt pattern with corresponding 1/2" diameter fine thread wheel studs
  • Bearing kit includes (2) inner wheel bearings, (2) outer wheel bearings, and (2) inner grease seals
  • No races or cups included

Comes as a Kit

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Key Specs

Rotor Diameter9.25 Inch
Rotor StylePlain Face
Rotor Material TypeSteel
Rotor Thickness0.884"
Bolt Pattern5 on 4.5"
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Need To Know

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Return Policy

Speedway Motors 91603021 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"

Speedway Motors 91603021 Specifications

KEY SPECS
MFG. Part #91603021
BrandSpeedway Motors
Rotor Diameter9.25 Inch
Rotor StylePlain Face
Rotor Material TypeSteel
Rotor Thickness0.884"
Bolt Pattern5 on 4.5"
GENERAL
PositionFront
Rotor ShapeRound
Rotor TypeVented
Rotor FinishPlain
Flange Diameter5.75"
Stud Length1.25"
Stud Diameter0.5"
Sold in QuantityKit

Ratings & Reviews

5

24 Reviews

Overall Assessment

Customers highly recommend the product due to its excellent quality and fit. The parts streamline the process of changing from 4 lug to 5 lugs, allowing easy installation and getting vehicles back on the road in a short amount of time. The product is praised for being perfect for applications like old Ford models, with its quality surpassing customer expectations. The bearing numbers are helpful for determining fit for unique applications. The product ensures a smooth and positive braking experience, reflecting its superior performance. It is considered good value, combining practicality and affordability.

5

24 reviews

5

23

4

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Good quality stuff

5.0

a month ago

Earl

Smithfield, nc

Verified

I do automotive restoration for a living. Speedway parts always works out.

Would Recommend

Yes

5.0

3 months ago

Denny

Green valley Arizona

Verified

They was used on the front of my 40 ford pu

Would Recommend

Product was a great fit and as advertized

5.0

a year ago

AVPir8

Herndon,Va

Verified

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

Would Recommend

Yes and would recommend Speedeway to anyone.

5.0

a year ago

Sid

Louisiana

Verified

Excellent quality for the price

Would Recommend

I would buy again

5.0

a year ago

Royal

Fresno Ca.

Verified

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

Would Recommend

perfect and what I was looking for

5.0

a year ago

Vince V

Milwaukie Or.

Verified

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.

Would Recommend

I am very happy with my purchase

5.0

a year ago

Bob (Red)

Colchester, CT

Verified

I replaced the front brakes on my 36 Ford pickup, very happy with the quality and price of the parts, much better than the quality of the aftermarket units they replaced.

Would Recommend

Yes

5.0

2 years ago

Paul Nelson

Novato Ca

Verified

Always get the best parts from you

Would Recommend

Crazy cheap

5.0

3 years ago

Bukshe

northern Ontario

Verified

I bought these to get the car on its wheels and push it around. Planning on Wilwoods.

Would Recommend

Excellent quality

5.0

3 years ago

Perry

Orem, Utah

Verified

Haven't run these parts yet but the fit and quality appear to be excellent

Would Recommend

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Showing 10 of 24 reviews

Questions & Answers

1 Question1 Answer

is the price right !!!! $83,99 for only one disk brake rotor and berarinsg or is for the pair ?????

by Leo

7 years ago

1 answer

1 of 1 questions shown

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