1974-80 Ford 11 Inch Front Disc Brake Rotors
1974-80 Ford 11 Inch Front Disc Brake Rotors
Speedway Motors

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#91031066

1974-80 Ford 11 Inch Front Disc Brake Rotors

  • This brake rotor is used for 1974-80 Mustang II applications, using bearing/seal kit 91031000
  • NOT interchangeable with rotor 91031067
  • This brake rotor was OEM on 1975-80 Ford Granada and Mercury Monarch, 1974-77 Ford Maverick and Mercury Caliente/Comet, and 1977-80 Lincoln Versailles
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Bolt Circle Pattern:

5 x 4-1/2"

5 x 4-3/4"

$77.99

/each

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Product Summary

Front Position, Round Rotor Shape, Vented Rotor Type

  • This brake rotor is used for 1974-80 Mustang II applications, using bearing/seal kit 91031000
  • NOT interchangeable with rotor 91031067
  • This brake rotor was OEM on 1975-80 Ford Granada and Mercury Monarch, 1974-77 Ford Maverick and Mercury Caliente/Comet, and 1977-80 Lincoln Versailles
  • Rotor measures 11" in diameter and 0.88" thick
  • Features 1/2"-20 fine threaded wheel studs
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Key Specs

Rotor Diameter11 Inch
Rotor StylePlain Face
Rotor Material TypeCast Iron
Rotor Thickness0.88"
Bolt Pattern5 on 4.5"
See more specs

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Speedway Motors 91031066 Details

This disc brake rotor was OEM on:

  • 1975-1980 Ford Granada
  • 1974-1977 Ford Maverick
  • 1977-1980 Lincoln Versailles
  • 1974-1977 Mercury Caliente, Comet
  • 1975-1980 Mercury Monarch

NOT interchangable with rotor 91031067. If you have the brackets and adapters designed for the Granada rotor, the GM rotor 91031067 will not fit. Very common rotor to use as a conversion rotor.

Speedway Motors 91031066 Specifications

KEY SPECS
MFG. Part #91031066
BrandSpeedway Motors
Rotor Diameter11 Inch
Rotor StylePlain Face
Rotor Material TypeCast Iron
Rotor Thickness0.88"
Bolt Pattern5 on 4.5"
GENERAL
PositionFront
Rotor ShapeRound
Rotor TypeVented
Rotor FinishPlain
Stud Length1.29"
Stud Diameter0.5"
Thread Pitch1/2"-20
Weight20.55 lbs.
Sold in QuantityEach
NotesNOT interchangable with rotor 91031067. If you have the brackets and adapters designed for the Granada rotor, the GM rotor 91031067 will not fit.KNURL DRILL 17/32 (.531)

Ratings & Reviews

4.9

12 Reviews

Overall Assessment

Customers highly recommend the product, frequently noting its excellent quality and perfect fit for various vehicles. Many appreciate the product's practical usability, specifically its converting ability, with one user successfully changing their car's front end to a Ford bolt pattern. The product's superior braking performance is also praised due to its larger rotors. Users confirm that the product is comparable to what they would find in local parts stores, fulfilling expectations exceptionally. Despite potential overseas production, the quality and fitment are not compromised, separating it from competitors.

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4.9

12 reviews

5

11

4

1

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work out well

5.0

a year ago

Joe

Elk grove Ca

Verified

The brake rotors are of good quality

Would Recommend

T bucket rotors and bearings

5.0

2 years ago

Jim K

Tacoma WA

Verified

Perfect fit.

Would Recommend

Yes I would buy this product again.

5.0

3 years ago

Urastus86

Ashley, Mi.

Verified

The people at Speedway were very easy to understand & work with. I'm totally satisfied with them & the product I purchased.

Would Recommend

11" disc brake rotors

5.0

4 years ago

David

Arizona

Verified

My CJ-5 is going to love these.

Would Recommend

Would recomend to all who need these !!

5.0

4 years ago

Bill

Parkesburg, PA

Verified

Nothing to say, worked as intended !!

Would Recommend

Good product

5.0

6 years ago

Scott

NC

Verified

had to machine down to fit the 10 1/2 caliper bracket they sell

I will buy this product again

5.0

7 years ago

Lynn Krebs

Montrose, CO

Verified

Worked great to convert my cars front end to a ford bolt pattern

Would Recommend

I would buy this product again

5.0

7 years ago

None

Missouri

Verified

They fit perfectly

Would Recommend

I would buy again

5.0

8 years ago

Jg

Chaplin ct

Verified

Used on 49 chevy truck worked great

Would Recommend

Great Quality

5.0

10 years ago

Joyer

Lebanon, OH

Verified

Used this with Speedway's mustang II IFS on a 1949 Chevy with steelies and it works just fine. Quiet ride. Handles fine.

Would Recommend

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Showing 10 of 12 reviews

Questions & Answers

8 Questions • 10 Answers

Which inner and outer bearings work with this rotor? The rotor will be installed on a Mustang II spindle.

by Albert

• 7 years ago

1 answer

View Answer

Will these rotors work with the 2" dropped spindle you offer? Are the studs pre-installed?

by Philip

• 8 years ago

2 answers

View Answers

Which dust caps fit these rotors? Are the 910-31071 the correct ones?

by Rocketman

• 8 years ago

1 answer

View Answer

do you offer a 3inch long wheel stud for this rotor?

by chris

• 8 years ago

1 answer

View Answer

What is center hub diameter? Trying to fit aftermarket wheels to this rotor. Most wheel applications are for late model cars so a custom fit might be required. What is the center hub diameter to ensure this will fit inside the center bore on new wheels? Also, would a hub centering ring be required?

by BrianD

• 12 years ago

1 answer

View Answer

what size are the wheel studs on this rotor. would be helpful if this was included in the description, thanks.

by cforcht

• 14 years ago

1 answer

View Answer

What caliper brackets do I need to mount GM metric calipers to a mustang II spindle with this rotor? The caliper brackets seem to be listed as Hybrid or 10 1/2" brackets, I don't see an 11 inch bracket. Thanks

by

• 14 years ago

2 answers

View Answers

Does this particular rotor use the same bearings as a stock drum and hub set up or do I have to buy new bearings? My old bearings I just replaced about 6months ago I would like to reuse them.

by

• 14 years ago

1 answer

View Answer

8 of 8 questions shown

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