Wheel backspacing

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Nov 26, 2012 | 02:19 PM

laboss1

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Racer

Joined: May 2008

Posts: 342

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From: prescott az

Wheel backspacing

Can someone tell me what the backspacing is on a 1990 zr 1 rear wheel?
Thank you in advance.

Bob

Nov 26, 2012 | 03:05 PM

QCVette

Le Mans Master

Joined: Jun 2009

Posts: 6,528

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From: South Dakota

The offset on ZR1 rear 11" is 36mm

The back spacing is 11"/2 =5.5" + 36mm(1.417") + about 1/2" for the wheel lip. Or approximately 7.417" if I figured it right.

Nov 26, 2012 | 04:34 PM

laboss1

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Racer

Joined: May 2008

Posts: 342

Likes: 4

From: prescott az

Thank you very much.

Nov 26, 2012 | 04:57 PM

WVZR-1

Team Owner

Joined: Sep 2003

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Quote:

Originally Posted by QCVette

The offset on ZR1 rear 11" is 36mm

The back spacing is 11"/2 =5.5" + 36mm(1.417") + about 1/2" for the wheel lip. Or approximately 7.417" if I figured it right.

Agreed!

It's generally advertised at 7.4 and I do the math a little different

11" + 1"(wheel flanges)12/2 = 6.0 + (36/25.4)1.4(rounded down)= 7.4

Backspacing could vary for all the wheels of a set! I always add the "accepted rule of 1" for flanges" when calculating advertised offsets but to accurately accomplish back-spacing dimensions the total width of the actual wheel should be used.