Steering, Suspension, & Brakes

tips, technology, tools and techniques related to non-driveline mechanical components

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robert1839
Tristan Cook
5579 Timber Ridge Dr, Mt Vernon, Skagit, Washingto
(118 posts)

Registered:
05/06/2013 11:11PM

Main British Car:
MGB GT 1972 Buick 215

wheels
Posted by: robert1839
Date: June 01, 2013 07:46PM

What is the largest with of wheel that a stock MGB GT can have


Moderator
Curtis Jacobson
Portland Oregon
(4411 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: wheels
Posted by: Moderator
Date: June 02, 2013 12:46AM

Your stock rear axle probably isn't centered side-to-side. If you carefully center the axle, you should be able to fit 15x7 wheels with a -22mm offset and to use 225/50 tires. (That's the combination on Graham Creswick's roadster. I know no difference between roadster and GT when it comes to fitting wider wheels.) You'll almost certainly have to grind a bit on the lips of your fenders for tire clearance! Tire sidewall shape/size varies from manufacturer to manufacturer and from model to model, even within a nominal size (e.g. 225/50.) You may find that you need to install some sort of device to keep your axle centered, such as a Panhard rod or Watts link.

Your results may vary. Actually, mine did. I have 15x6 -22mm offset wheels and 205/50 tires on my GT yet I found that my front tires scrub on my Addco front anti-sway bar, both sides, which evidently reduces my turning radius. A different anti-sway bar would help.

Some people cut into (and rebuild) the bump stop mounting feature inside their rear wheel wells to provide tire clearance... but as far as I recall, Graham didn't have to do that.


robert1839
Tristan Cook
5579 Timber Ridge Dr, Mt Vernon, Skagit, Washingto
(118 posts)

Registered:
05/06/2013 11:11PM

Main British Car:
MGB GT 1972 Buick 215

Re: wheels
Posted by: robert1839
Date: June 02, 2013 02:37PM

ok i guess i will have to go with the 15 by 6 becase i dont have the tools to do it right with the 15 by 7 wheels


mstemp
Mike Stemp
Calgary, Canada
(193 posts)

Registered:
11/25/2009 07:18AM

Main British Car:
1980 MGB Rover 4.6L

Re: wheels
Posted by: mstemp
Date: June 04, 2013 01:03PM

With more offset (~38mm) you can use 16X7" wheels. I run 205/55/16 on my 1980 MGB and 9 mm spacer on RHS and a 6 mm spacer on LHS. No rubbing on the inner fender/bulge but sometimes I get a slight rub on the outer fender lip. Ten minutes with a grinder and there would be no issue. Just worried I might slip and make a mess of my shinny new paint. Not sure if 15" rims would end up closer top the inner bulge from the bump stops however.

Lots more wheels to choose from in 7" vs 6" wide.


J Man
jason adkins
NW OH
(194 posts)

Registered:
01/21/2009 08:49PM

Main British Car:
'61 Morris Minor panel, '70 MGB GT, '74 MGB GT MGB 1.8, unsure yet on the GTs

Re: wheels
Posted by: J Man
Date: July 13, 2013 02:17AM

Is the rear axle not centered from the factory or is it something that happens over time?


mstemp
Mike Stemp
Calgary, Canada
(193 posts)

Registered:
11/25/2009 07:18AM

Main British Car:
1980 MGB Rover 4.6L

Re: wheels
Posted by: mstemp
Date: July 14, 2013 11:00AM

J Man,

Yes the factory had a messed up jig and most are off by 1/4" I believe.


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