11 Inch Mustang II Rotor with GM 4.75 Inch Bolt Circle, Metric Caliper

#91031070

11 Inch Mustang II Rotor with GM 4.75 Inch Bolt Circle, Metric Caliper

Name: 11 Inch Mustang II Rotor with GM 4.75 Inch Bolt Circle, Metric Caliper
Brand: Speedway Motors
SKU: 91031070
Price: 87.99 USD
Availability: InStock
Rating: 4.9 (18 reviews)

18 Reviews

10 Questions

This rotor allows the use of GM Metric calipers along with a GM car 5 on 4-3/4" bolt pattern
Granada style rotor uses standard Ford bearing and seal sizes to allow the use of commonly available parts
For use with popular GM Metric calipers and brackets

Bolt Circle Pattern:

5 x 4-3/4"

5 x 4-1/2"

$87.99

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Product Summary

Front Position, Round Rotor Shape, Vented Rotor Type

This rotor allows the use of GM Metric calipers along with a GM car 5 on 4-3/4" bolt pattern
Granada style rotor uses standard Ford bearing and seal sizes to allow the use of commonly available parts
For use with popular GM Metric calipers and brackets
Bearing and seal kit sold separately such as part number 91031052
7/16" fine thread wheel studs come installed in the rotor which match typical GM stud size

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Key Specs

Rotor Diameter	11 Inch
Rotor Style	Plain Face
Rotor Material Type	Cast Iron
Rotor Thickness	0.88"
Bolt Pattern	5 on 4.75"

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Installation Details

Installation Tips

Proper Break-In Procedure for Steel or Cast Iron Rotors

New steel/iron rotors should be bedded in before being used in racing conditions. Proper bedding will prepare the rotor surface, prolong the rotor's life, and make it more resistant to thermal checking or cracking under severe braking conditions. The following procedures should be performed when bedding in both steel and cast iron rotors. It is best to bed in a new rotor using a used set of pads, preferably ones which will not create heat rapidly. Generating heat too rapidly will thermal shock the rotors. Likewise, when bedding in a new set of brake pads it is best to perform the process on a used rotor. This new/used bedding process permits controlled bedding of each individual component.

Make sure rotor surfaces are free from oils, grease, and brake fluid. Run vehicle up to a moderate speed and make several medium deceleration stops to heat up the rotor slowly. This will help reduce the chance of thermal shock caused by uneven heating of the rotor. Pull into the pits and allow the rotor to cool to ambient air temperature. Care should be taken not to ride the brakes into the pits as this may hot spot the rotor causing premature wear to the surface or structural damage.

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Speedway Motors 91031070 Details

This rotor allows the use of GM Metric calipers along with a GM car bolt pattern. Vented stock 11" diameter brake rotors for 1974-1980 Mustang II, Pinto, or Bobcat spindles (or popular GM Metric calipers and brackets). Brake rotors are new, not plugged or re-drilled. Has a 5 on 4-3/4" bolt pattern with corresponding 7/16" diameter fine thread wheel studs.

5 on 4.75" Bolt circle
Granada type rotor
For use with popular GM Metric calipers and brackets
Bearing and seal kit sold separately (910-31052)

CA Prop 65

Speedway Motors 91031070 Specifications

KEY SPECS
MFG. Part #	91031070
Brand	Speedway Motors
Rotor Diameter	11 Inch
Rotor Style	Plain Face
Rotor Material Type	Cast Iron
Rotor Thickness	0.88"
Bolt Pattern	5 on 4.75"

GENERAL
Position	Front
Rotor Shape	Round
Rotor Type	Vented
Rotor Finish	Plain
Stud Length	0.88"
Stud Diameter	0.43"
Weight	20.65 lbs.
Sold in Quantity	Each

Ratings & Reviews

4.9

18 Reviews

Overall Assessment

Customers highly praise our 11-inch brake rotors for their perfect fit, quality, and enhanced braking performance. The rotors are appreciated for being ready-to-use, needing no extra work except for packing bearings. They are specifically noted for exceptional compatibility with Mustang II spindles and GM metric brakes. Customers testify that these rotors improved their vehicles' handling and stopping performance dramatically, showcasing their superiority over stock drums and other competitor rotors. Constructed well, reliable, and practical, customers are likely to purchase again due to their satisfying experience.

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4.9

18 reviews

Most Liked Positive Review

5.0

Perfect fit on Mustang II front end with Gm metric brakes

I hope Speedway never discontinues this hybrid rotor type. They are perfect for Mustang II front ends. My old drilled / slotted 11 "rotors were warped, and I had brake judder from a high speed stop in my '41 Plymouth hot rod. I bought the new bearing, and seal kit to go along with the rotors. They are smooth, and strong with no shaking at all. I use high quality semi-metallic pads that leave very little dust. And, they work well with GM metric calipers. My 2900 lb. Mopar stops quick now. Thanks Speedway...Keep these in your catalog..

Most Liked Negative Review

3.0

ok This product has great features

have ordered many parts, always fits perfect. Speedway is to work with. if your not happy they care!!

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Perfect replacement and bolt pattern I needed.

5.0

a year ago

Gary

Denver

Verified

These rotors fit right on to my spindles and the caliper matched up perfectly.

Would Recommend

11" rotors to fit mustang 2 spindles

5.0

2 years ago

mad scientist

Dallas Tx

Verified

going on a vintage modified road race car

Would Recommend

fits and stops. What more could you ask for?

5.0

2 years ago

53Rat

Nice finish to my mustang ii swap. Would buy again. Hopefully will offer drilled/slotted in the future

Would Recommend

11 inch brake rotors

5.0

4 years ago

David Flagstaff

Arizona

Verified

Fits perfectly, could not ask for anything any better.

Would Recommend

Performed as advertised

5.0

5 years ago

Max

Morrisonville

Verified

Had to replace a rotor that had been damaged at the shop. It was the same as the complete front suspension that I purchased earlier for the project.

Would Recommend

Great brake kit

5.0

5 years ago

Dennis

New Lenox, il

Verified

Large rotor for much better brake performance compared to the stock drums

Would Recommend

great product

5.0

6 years ago

camk

Gimli Manitoba Canada

Verified

this was the second set as the first set came wrong in the box !

Would Recommend

I would definitely buy again.

5.0

6 years ago

none

Lake Havasu City

Verified

I'm rebuilding the front end of a 52 chevy with a Mustang II. This product fit my application well.

Would Recommend

Perfect

5.0

7 years ago

Warlock

New Brunswick canada

Verified

Using mustang 2 spindles, slipped on like a glove...

Would Recommend

Older is Finer

5.0

7 years ago

Greger

Colfax, WA

Verified

I am making a smoother drive experience in my Chevrolet Coupe. This purchase helped me to achieve that.

Would Recommend

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Showing 10 of 18 reviews

Questions & Answers

10 Questions • 10 Answers

Sort Questions

Part # 835150D0154K........... 150-D0154K D154 Promatrix Brake Pad Set, .565/.530 In will these pads work on this rotor? I want to change out the soft metallic pads that came with my IFS thanks

by Subvet

• 7 years ago

1 answer

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I have a TCI Chevy II front clip, and it uses GM metric calipers, and D154 pads, with an 11" rotor. Any chance this is the rotor I need to replace my cracked drilled and slotted rotor that was supplied with the kit?

by Robert

• 7 years ago

1 answer

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Hi, What would be the measurement from King pin center to the face of the hub where the Tire Rim bolts up? On the Mustang II Disc Rotor & the GM 11" Rotor ? I need to know so I know how Wide my Straight Axle should be! Thanks Larry

by Gasser Larry

• 7 years ago

1 answer

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Do these change the track width over the stock components?

by Don

• 8 years ago

1 answer

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I puchased the mustang ii bolt in ifs kit with a 910-31070 rotor that has the 5 on 4.75 lug pattern. I need to convert it to a 5 on 4.5 lug pattern. What is the correct number for this rotor? Thanks in advance for your time and efforts Andy b

by Andy

• 9 years ago

1 answer

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Hello, Assuming this doesnt come with bearings installed. Please let me know what bearing and seal is needed. Thank you Matt

by matt

• 10 years ago

1 answer

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Hi, do I need to get bigger brake caliper brackets for my calipers for these, at present just using the stock 9 1/4 " rotors with corresponding calipers?

by Dave

• 11 years ago

1 answer

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I am looking for a Granada rotor with 4 3/4 Chevy bolt pattern that uses #3 &#6 bearings Help

by Gary

• 11 years ago

1 answer

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Hub/center bore diameter? I would like to use with wheels from 2010 camero that I would like to use on my build They have 5 x 4 3/4 hole pattern and 66.6 mm hub/center bore

by BillJr

• 11 years ago

1 answer

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What studs are available for use with this rotor? I will be needing to install longer wheel studs. What are the knurl diameter and length on the supplied studs? Thanks

by DonP

• 12 years ago

1 answer

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10 of 10 questions shown

Fitment

1974-1978 Ford Mustang II

1974-1980 Ford Pinto

1975-1980 Mercury Bobcat