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#91031091
1979-Up GM Metric Brake Rotor, 5 on 4-3/4 In, 5/8-11 In Coarse Studs
- This 79 and up Metric brake rotor comes with 5/8"-11 coarse thread wheel studs installed
- Stock Metric bolt pattern of 5 on 4 3/4" to match stock rear ends
- Fits 2 wheel drive S-10 applications as well
$79.99
/each
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Product Summary
Front Position, Round Rotor Shape, Vented Rotor Type
- This 79 and up Metric brake rotor comes with 5/8"-11 coarse thread wheel studs installed
- Stock Metric bolt pattern of 5 on 4 3/4" to match stock rear ends
- Fits 2 wheel drive S-10 applications as well
- Premium cast iron vented rotor design is perfect for dirt circle track racing
- Not for use on asphalt circle track cars due to the high load and stress of that application - we suggest billet hubs for asphalt racing
Key Specs
| MFG. Part # | 91031091 |
| Rotor Diameter | 10.50 Inch |
| Rotor Style | Plain Face |
| Rotor Material Type | Steel |
| Bolt Pattern | 5 on 4.75" |
Need To Know
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Return PolicySpeedway Motors 91031091 Details
Speedway Motors 91031091 Details
This is a 1979-1981 Metric GM rotor with the bolt pattern changed to 5 on 4-3/4". It can be used on 1982-1987 GM metric spindles if you use our bearing/seal kit 91031048, or use at least the 1979-1981 style outer bearing 912TS3.
This rotor is designed for dirt track applications and should NOT be used for asphalt racing.
Notes
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.IMCA Approved.
Speedway Motors 91031091 Specifications
Speedway Motors 91031091 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 91031091 |
| Brand | Speedway Motors |
| Rotor Diameter | 10.50 Inch |
| Rotor Style | Plain Face |
| Rotor Material Type | Steel |
| Bolt Pattern | 5 on 4.75" |
| GENERAL | |
| Position | Front |
| Rotor Shape | Round |
| Rotor Type | Vented |
| Rotor Finish | Plain |
| Thread Pitch | 5/8"-11 |
| Sold in Quantity | Each |
Ratings & Reviews
4.7
13 Reviews
Customers appreciate the product for its great fit, easy installation, and ability to enhance the vehicle's performance, particularly in braking. It scores high on practicality, saving users time by eliminating the need for modifications. The product is recommended for dirt track racers and for those having trouble finding 5x4.75 bolt pattern rotors. However, for intense track use, durability may be a concern.
Ratings & Reviews
4.7
13 Reviews
Customers appreciate the product for its great fit, easy installation, and ability to enhance the vehicle's performance, particularly in braking. It scores high on practicality, saving users time by eliminating the need for modifications. The product is recommended for dirt track racers and for those having trouble finding 5x4.75 bolt pattern rotors. However, for intense track use, durability may be a concern.
4.7
13 reviews
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Most Liked Positive Review
5.0
Good ready to use rotor!
Not many options when it comes to the gm metric rotors and wanting to keep the 5x4.75 bolt pattern. This came just as I needed which saved me the time of modifying a stock rotor. Make sure you get the outer bearing if you have the big shaft spindles.
Most Liked Negative Review
1.0
Polished Junk.
I was excited to try out this rotor seeing that it's IMCA approved. With little luck with aftermarket rotors before I was willing to give this a chance. Turns out it's complete junk. Half way through its third race the center section cleanly broken from the rotor itself entering the turn sending the tire flying and me almost into the wall, costing me a win. Street use I'm sure this rotor is great. For the track, not so much. Junk.
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I will continue buying from Speedway Motors!
5.0
2 years ago
Heather
Newport, NH
Verified
I'm using this item on a race car. It fit perfectly well! It's now saved as my favorite shop for my Husband's race car!
Would Recommend
Really great quality hubs
5.0
2 years ago
Jeremy
Des Moines
Similar quality to more expensive brands. I will continue to buy these as needed.
Would Recommend
Polished Junk.
1.0
4 years ago
Travis
Warminster, PA
I was excited to try out this rotor seeing that it's IMCA approved. With little luck with aftermarket rotors before I was willing to give this a chance. Turns out it's complete junk. Half way through its third race the center section cleanly broken from the rotor itself entering the turn sending the tire flying and me almost into the wall, costing me a win. Street use I'm sure this rotor is great. For the track, not so much. Junk.
Would Not Recommend
Great product for the money
5.0
5 years ago
Mike
Iowa
Verified
Fits great
Would Recommend
Great product
5.0
6 years ago
Harvey
Little rock, AR
Verified
Works great,
Great part. I just installed with ease.
5.0
6 years ago
47Racing
starkville, ms
Verified
I highly recommend for and dirt track racers for sure.
Would Recommend
Nice parts
5.0
7 years ago
Zeblm648
Haines City
Verified
Fit nice
Would Recommend
most certaimly
5.0
7 years ago
jagz
iowa
Verified
everything is super
Would Recommend
I would buy this again
5.0
8 years ago
Ronnie Johnson
Wheat Ridge Colorado
Verified
Like all the products
Would Recommend
Yes I definitely would buy this again
5.0
9 years ago
Rocky
Pensacola Florida
Verified
We'll use the products on the front of the car make the breaking lot better and performance better of the vehicle
Would Recommend
Showing 10 of 13 reviews
Questions & Answers
Questions & Answers
13 Questions • 10 Answers
Will bearing kit # 91031886 work with these rotors?
by JFG
• 2 years ago
1 answer
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Why are these not recommended for asphalt?
by Tom
• 7 years ago
1 answer
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How much do these rotors weigh?
by Chad
• 7 years ago
1 answer
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Will this work with the 3 piece spindles?
by Matt
• 8 years ago
1 answer
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Will these rotors work with the afco master rotor install kit 10698518550 for a stock GM metric spindle ?
by Vendetta3113
• 9 years ago
1 answer
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Will this fit 79 Camaro spindles? Thanks.
by Shannon
• 9 years ago
1 answer
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will these work on an early 80s caprice and if so do you know what bearing combination i need?
by racer10x
• 10 years ago
1 answer
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Do this rotor come with bearing races already pressed in or do they have to still be installed?
by PJ
• 11 years ago
1 answer
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will this fit a 76 camaro?
by 00ssnorcal
• 11 years ago
1 answer
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will this fit a 76 camaro?
by 00ssnorcal
• 11 years ago
1 answer
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