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wheel spacers on 83 sc

I decided I would like to widen the rear track on my sc so I recently purchased a set of 21mm spacers and corresponding wheel studs.

I jacked my car up and got everything changed over. After lowering the car I noticed the wheel on drivers side was protruding slightly more than passengers side. This really wasn't noticeable beforehand and in retrospect I should have measured.

The wheel on the passenger's side looks good but the driver's side wheel will rub the lip of the fender when driving over bumpy roads. So after having a much closer look at everything it seems the driver's side spacer should be machined down to 11mm (that's -10mm less).

Is this normal? Could there be that much of a discrepancy in the shape to the sheet metal? Can the drivetrain be off by that much?

It's quite puzzling and I'm a bit apprehensive about having one spacer machined.

What thinks the forum?
hughc
Old 09-03-2017, 12:25 PM
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quite common, these cars were hand built and may be off side to side. I had to roll my front fenders due to discrepancy.
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Old 09-03-2017, 12:37 PM
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this (hand made tolerance) and maybe a not even camber may cause your observation.

When I mounted 22mm spacers on my SC (with 7y16/225-50) back in 2012 I had no issues whatsoever.

don't machine the spacer.
look for the real cause of misalignment.
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Old 09-03-2017, 12:40 PM
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Quote:
Originally Posted by hughc View Post
... I'm a bit apprehensive about having one spacer machined...
That is what one of the previous PO did, probably when it was slanted.

Shaved one rear adaptor by 3/8" (9.525mm).
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Old 09-03-2017, 01:18 PM
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I have a 78 SC. I installed the 21mm H&R spacers and the same thing occurred. My drivers side rear was sticking out a little to far causing it to hit the lip of the fender over bumps. The passenger side was perfect no issues. I thought about milling down the spacers but was unsure. In the end I decided to roll the fender. No issues now.
Old 09-03-2017, 02:41 PM
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Wheel Spacers

Yep,

This happened on our 1978 911 race car and on our 2002 Boxster S when pushing the wheels out
to the limits - -

You might try just buying a pair of 5MM and get your 10MM on the drivers side instead of milling
the 21MM spacer . . .

Rolling the fenders seems to be a necessary evil when pushing the wheels out . . .

Regards,
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Old 09-03-2017, 07:54 PM
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Quote:
Originally Posted by Sboxin View Post
Yep,

This happened on our 1978 911 race car and on our 2002 Boxster S when pushing the wheels out
to the limits - -

You might try just buying a pair of 5MM and get your 10MM on the drivers side instead of milling
the 21MM spacer . . .

Rolling the fenders seems to be a necessary evil when pushing the wheels out . . .

Regards,
Everything is back to normal now but I think I will go ahead and order a pair of 5mm spacers as per your suggestion.

I don't think I want to have the fender rolled at this point and I'm not sure who I can trust to do a proper alignment but I will ask around.
Thanx guys.
Old 09-04-2017, 10:32 PM
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Hi Hugh (and Flojo), what length of studs did you swap in?
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Old 09-05-2017, 12:13 AM
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kept stock.
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Old 09-05-2017, 12:52 AM
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When I originally installed the 21mm spacers I used 66mm studs (45+21=66) and now that I've reverted back to the original set-up (no spacers) I've kept the 66mm studs but bought a set of open 14x1.5 wheel nuts which work just great.

I figured there was no need to go thru the hassle of re-installing the original studs (PITA) since it is still my intention to eventually install the spacers.

Works for me.
Old 09-05-2017, 03:23 AM
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Thanks. I've got 17 inch wheels on the SC, but I feel with the extra weight (rotating mass etc) it makes the SC feel a little lethargic. So I'm going back to the stock 16" wheels. But I don't like the look of the rear wheel wells not being filled out, so I thought I'd go down the spacer route.
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Old 09-05-2017, 12:41 PM
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25mm rear bolt on. 10mm front. Stock wheels and tires.

lowered.

easy cheap and looks good. No rolling required.

IMG_2570 by ryan.watson, on Flickr
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Old 09-05-2017, 01:17 PM
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