MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

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kerbau53
Geoff Morton
Naples, FL
(109 posts)

Registered:
08/09/2010 10:27PM

Main British Car:
78 MGB Ford 5L

Wheel backspace
Posted by: kerbau53
Date: September 01, 2010 06:02AM

Would anybody who is running 15X7 or 15X8 wheels with 55 or 60 series tires be good enough to let me know the distance between the hub mount side of their wheel and the back of the rim? As I check on wheels I'm finding a number of vendors using the term backspace and offset synonymously. Others are quoting backspace +/- offset to describe their product. My interest lies with a set of wheels with 3.5 inch backspace (offset not applied to measurement). I'd like to get a handle on what others have mounted.

Thx!


ex-tyke
Graham Creswick
Chatham, Ontario, Canada
(1165 posts)

Registered:
10/25/2007 11:17AM

Main British Car:
1976 MGB Ford 302

authors avatar
Re: Wheel backspace
Posted by: ex-tyke
Date: September 01, 2010 09:34AM

Wanting a 3.5" backspace on a 7" rim suggests that you want about 1/2" of negative offset.
FWIW, I'm running 15x7 Panasports with 22mm (7/8") positive offset - that equates to a 4-7/8" backspace.

Attached is a wheel offset/backspace chart to help you.
[www.rsracing.com]



Edited 1 time(s). Last edit at 09/01/2010 09:38AM by ex-tyke.


kerbau53
Geoff Morton
Naples, FL
(109 posts)

Registered:
08/09/2010 10:27PM

Main British Car:
78 MGB Ford 5L

Re: Wheel backspace
Posted by: kerbau53
Date: September 02, 2010 02:26AM

Paul,

Have looked at your car in the gallery many times as I've waffled about whether or not to use flares. 20 years ago I'd have loved to be able to afford Minilites on my GT. Same colour as your car. I'm considering wires now. The problem I'm having is with sales people seemingly using the terms offset and backspace interchangeably.

Thx.
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kerbau53
Geoff Morton
Naples, FL
(109 posts)

Registered:
08/09/2010 10:27PM

Main British Car:
78 MGB Ford 5L

Re: Wheel backspace
Posted by: kerbau53
Date: September 14, 2010 10:15AM

Found an interesting website. rimsntires.com. Left margin, click size comparer.


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