Rotor center hole diameter? - Chevelle Tech
Brakes, Suspension & Steering Conversion questions & more.

 
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post #1 of 4 (permalink) Old Jan 15th, 19, 8:26 PM Thread Starter
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Dan
 
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Rotor center hole diameter?

Hi, I'm installing a Right Stuff Detailing disc brake conversion on on my '69 with a new to me 12 bolt rear.
I installed Summit Racing replacement axles. https://www.summitracing.com/parts/SUM-700120
Now I find that the center hole in the disc brake rotor is too small for the raised section on the axle flange.
My question is: When I get the rotor machined to fit, how much larger than the axle should the hole be?
Is it this raised part of the axle that holds the rotor centered or is it the lug nut studs that hold the rotor centered?
Thanks.
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post #2 of 4 (permalink) Old Jan 16th, 19, 9:45 AM
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Dave
 
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Re: Rotor center hole diameter?

The axle hub diameter you have is probably 2.80" and the rotor is 2.78" which is why they don't fit. I know Wilwood solves this problem by incorporating center registration adapters for their rotors. I believe my last rear disc kit came with 3.06" O.D. adapters for a 2.804" center registration (Rotors have a 3.06" center hole diameter). See index #18 in the photo.
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Last edited by David Bates; Jan 16th, 19 at 10:13 AM.
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post #3 of 4 (permalink) Old Jan 16th, 19, 6:36 PM
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Andrew
 
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Re: Rotor center hole diameter?

Quote:
Originally Posted by danbo View Post
Hi, I'm installing a Right Stuff Detailing disc brake conversion on on my '69 with a new to me 12 bolt rear.
I installed Summit Racing replacement axles. https://www.summitracing.com/parts/SUM-700120
Now I find that the center hole in the disc brake rotor is too small for the raised section on the axle flange.
My question is: When I get the rotor machined to fit, how much larger than the axle should the hole be?
Is it this raised part of the axle that holds the rotor centered or is it the lug nut studs that hold the rotor centered?
Thanks.
The hole in the rotor should be a snug fit over the axle. The axle register is what keeps the rotor aligned with the axles. The studs just hold the wheels on. So you're looking for a snug slip fit between the rotors and axle resisters.

Andrew


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post #4 of 4 (permalink) Old Jan 16th, 19, 7:45 PM Thread Starter
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Dan
 
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Re: Rotor center hole diameter?

Thank you both!
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