1979-Up GM Metric Stock Car Disc Brake Rotor, 5 on 5 Inch

Name: 1979-Up GM Metric Stock Car Disc Brake Rotor, 5 on 5 Inch
Brand: Speedway Motors
SKU: 91031061
Price: 60.99 USD
Availability: InStock
Rating: 5 (13 reviews)

13 Reviews

12 Questions

5 on 5" bolt circle
10.5" diameter x 1" thick durable rotors
82-'87 spindle applications, and must use 912-TS3 outer bearings

$60.99

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$66.00

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Product Summary

Front Position, Round Rotor Shape, Vented Rotor Type

5 on 5" bolt circle
10.5" diameter x 1" thick durable rotors
82-'87 spindle applications, and must use 912-TS3 outer bearings
Large bearing fits most metric spindles
*Not Designed for asphalt racing

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Key Specs

Position	Front
Rotor Shape	Round
Rotor Diameter	10.50 Inch
Rotor Type	Vented
Rotor Style	Plain Face

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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 91031061 Details

This 1979-up GM Metric front disc brake rotor will work with a Set # 6 inner bearing/race which fits most spindles. 5 on 5" with 5/8" coarse studs installed. 10.5" diameter x 1". Must be used with 912-TS3 outer bearings for 1982-1987 spindle applications. IMCA Approved.

This is a 1979-1981 Metric GM rotor with the bolt pattern changed to 5 on 5". It can be used on 1982-1987 GM metric spindles if the 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.

Item Details

5 on 5"

CA Prop 65

Speedway Motors 91031061 Specifications

KEY SPECS
MFG. Part #	91031061
Brand	Speedway Motors
Position	Front
Rotor Shape	Round
Rotor Diameter	10.50 Inch
Rotor Type	Vented
Rotor Style	Plain Face
Rotor Material Type	Cast Iron

GENERAL
Speedway Motors Catalog Part #	910-31061
Rotor Finish	Natural
Rotor Thickness	1"
Bolt Pattern	5 on 5"
Stud Length	2.32"
Stud Diameter	0.63"
Thread Pitch	5/8"-11
Weight	18.15 lbs.
Sold in Quantity	Each
Notes	Designed for dirt track applications.