1973-77 GM Midsize 11 Inch Disc Brake Rotor
1973-77 GM Midsize 11 Inch Disc Brake Rotor
Speedway Motors

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#91031063

1973-77 GM Midsize 11 Inch Disc Brake Rotor

  • This factory replacement 11" front disc brake rotor fits 1973 to 1977 GM midsize cars
  • Premium cast iron vented rotor construction dissipates heat to reduce or eliminate brake fade
  • OEM size 5 on 4-3/4" bolt circle makes this a direct replacement
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Type:

Standard - 5 x 4-3/4"

Drilled/Slotted - 5 x 4-3/4"Standard - 5 x 4-1/2"Drilled/Slotted - 5 x 4-3/4" (Stage 1)Drilled/Slotted - 5 x 4-3/4" (Stage 1.5)

$74.99

/each

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Product Summary

Front Position, Round Rotor Shape, Vented Rotor Type

  • This factory replacement 11" front disc brake rotor fits 1973 to 1977 GM midsize cars
  • Premium cast iron vented rotor construction dissipates heat to reduce or eliminate brake fade
  • OEM size 5 on 4-3/4" bolt circle makes this a direct replacement
  • Includes 7/16" fine thread wheel studs (installed)
  • New bearing races come installed in this rotor with bearing and seal kits available separately to complete the installation
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Key Specs

Rotor Diameter11 Inch
Rotor StylePlain Face
Rotor Material TypeCast Iron
Rotor Thickness1"
Bolt Pattern5 on 4.75"
See more specs

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Speedway Motors 91031063 Details

This factory replacement 11" front disc brake rotor fits 1973-77 GM midsize chassis. Has a 5 on 4-3/4" bolt pattern.

Additional Note: If you require this rotor with the 5 x 4-1/2" Ford bolt pattern see Part # 91031067.

Application

  • 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

Speedway Motors 91031063 Specifications

KEY SPECS
MFG. Part #91031063
BrandSpeedway Motors
Rotor Diameter11 Inch
Rotor StylePlain Face
Rotor Material TypeCast Iron
Rotor Thickness1"
Bolt Pattern5 on 4.75"
GENERAL
PositionFront
Rotor ShapeRound
Rotor TypeVented
Rotor FinishPlain
Flange Diameter6.44"
Stud Length0.94"
Stud Diameter0.44"
Thread Pitch7/16"-20
Sold in QuantityEach
NotesMax outer bearing snout diameter is 2.78".KNURL DRILL 33/64 (.515) 91005908 STUD 7/16-20 .565 KNURL

Ratings & Reviews

4.4

16 Reviews

Overall Assessment

Customers consistently regard these rotors as high-quality, reliable parts that perfectly fit their vehicles, with many users specifically choosing them for various car builds and drum brake conversions. They appreciate the precise fitment and the exceptional durability of the rotors, which offer great functionality and superior performance compared to similar parts from other companies. Despite some inconsistencies with stud spacing, consumers continue to confirm customer satisfaction with the rotors', usability, material quality, and safe operation. Customers are impressed by the aesthetic appeal and commitment to detail in the rotors' design and highly recommend them for their dependability, effectiveness, and quick, easy installation.

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4.4

16 reviews

5

12

4

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2

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Most Liked Positive Review

5.0

Good looking part - nice attention to de

I bough these brake rotors as part of a front end replacement kit. So far I have only used them to mock up the front end but am impressed with the look and fit of them. They appear to be a good quality part and should look nice when finished.

Most Liked Negative Review

1.0

Speedway has not sent proper stud spacing rotors?

On two different set of rotors the spacing is not 6 on 5.5. It is something close but not exact. Now they refuse to speak with me or get me correct parts. I have figured out that once the third lugnut goes in pressure get put on the side of the shanked lugnut and it jumps a thread causing immediate binding which then breaks the stud. Wheels go on my original hubs perfect with no issues.

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I will always buy your products.

5.0

a month ago

Cruiser

Oregon

Verified

This product arrived in a timely manner and has worked well

Would Recommend

I would buy this product again.

5.0

6 months ago

snowbunny

Spring Texas

Verified

fit and worked out as expected

Would Recommend

I would buy this again.

5.0

a year ago

Dandy

Texas

Verified

It is on my 30 Model high boy project

Would Recommend

check bolt pattern

1.0

a year ago

poor racer

oregon

Verified

the rotor i received was 5 on 4 an 1/4 not 3/4 which is a trailer pattern or mopar. can't return it because i drilled it out for big studs before installation, check bolt pattern upon arrival!

Would Not Recommend

Seem ok

4.0

a year ago

Bob

Vernon nj

Verified

Vehicle is still being built, seems ok and run true on bearings

Would Recommend

Fit perfect

5.0

2 years ago

D Bagwell

SC

Verified

Used on the front of my t bucket after swapping the inside race.

Would Recommend

32 Ford steering wheel vibration

5.0

2 years ago

32 Coupe

Minneapolis

Verified

Just what I needed to solve a bad steering wheel vibration on my 32 coupe. After chasing this problem with other parts, I was able to finally smoothen out my ride with new rotors and bearings.

Would Recommend

Nice Rotors

5.0

2 years ago

Clamper

N. Calif

Verified

Using them on my drum brake conversion. They are working great

Would Recommend

as in the past, parts I buy from Speedway, work well

5.0

3 years ago

Fred

Rochelle, il.

Verified

i build a number of different cars, parts i get from Speedway, always work how they should

Would Recommend

Speedway has not sent proper stud spacing rotors?

1.0

4 years ago

Mark

Belmont NH

On two different set of rotors the spacing is not 6 on 5.5. It is something close but not exact. Now they refuse to speak with me or get me correct parts. I have figured out that once the third lugnut goes in pressure get put on the side of the shanked lugnut and it jumps a thread causing immediate binding which then breaks the stud. Wheels go on my original hubs perfect with no issues.

Would Not Recommend

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Showing 10 of 16 reviews

Questions & Answers

6 Questions • 7 Answers

Which wheel bearing kit would be compatible with these rotors and a 73-77 Monte carlo?

by Orangeracer

• 3 years ago

1 answer

View Answer

Are these rotors able to be drilled out for use with 5/8 studs Part # 91005960

by jared

• 9 years ago

1 answer

View Answer

what bearing and seal kit fit these rotors?

by Ruff Ruff

• 9 years ago

1 answer

View Answer

Do you have the lugnuts for this rotor? Thanks

by scott

• 9 years ago

1 answer

View Answer

What size lug nuts ? I need to know what size and type lug nuts do I use on this rotor, also what is the diameter of the studs. Thanks a lot !!

by ZebWalton

• 11 years ago

2 answers

View Answers

I purchased the front axle steering and brake kit with ford spindles, the rotors are 5 on 4.5 and i was wondering if these rotors would work with that setup?

by matt

• 15 years ago

1 answer

View Answer

6 of 6 questions shown

Fitment

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