255/50/17's - replaced baldies, new ones don't fit! - TCCoA Forums
 
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post #1 of 5 (permalink) Old 07-12-2008, 09:58 AM Thread Starter
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255/50/17's - replaced baldies, new ones don't fit!

I'm confused here.

My car is lowered (Eibach's), and I've already removed the stem of the upper balljoint years ago when I first installed a set of 255/50/17's.

I had new tires put on this morning, brought the wheels+tires home - and they rub on the upper control arm where the already shaved ball joint stub come together.

WTF???

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post #2 of 5 (permalink) Old 07-12-2008, 01:44 PM
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255 is the section width, not the tread width. I noticed a bunch of difference in tread width on same section width tires. There was a ranting raving thread on here from awhile ago, I don't suggest searching for it, lots of sour grapes at tire companies and raving.

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post #3 of 5 (permalink) Old 07-12-2008, 03:06 PM Thread Starter
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Yup, I get that (kinda), but it isn't the width that's the problem - it's the overall height (diameter) of the tire.

A 255/50/17 should be 27" bang on, which should clear the upper control arm.

There is already a 5/16" spacer on the front to keep the inner sidewall off the spindle (and space out the higher offset Lincoln LS wheels).

Am considering doing what some would propose to be very stupid - grind about 1/16" more material off, essentially thinning the spindle.

Notice - I said 1/16" which is all that's being affected - not cutting the damn control arm in half!!!

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Last edited by Kevin; 07-15-2008 at 01:11 PM.
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post #4 of 5 (permalink) Old 07-13-2008, 08:55 AM
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I would assume the new tires are a different brand? Tires in the same size are not always equal. Sounds like you were marginal to start with as you had to grind. Offset of the wheel also comes into play. I run 255/50-16 on Sport wheels and have clearance left.

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post #5 of 5 (permalink) Old 07-15-2008, 01:12 PM Thread Starter
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True, same wheel (type) though for all 3 brands of tires.

Swapped tires to+fro from my Lincoln LS while I had it for those short 4 years. The LS uses a 39mm offset I believe, while the MN12 uses 41mm. That 2mm equates to rubbing...

It is indeed very marginal. Minor differences in sizes was the problem.

After a bit of grinding, my problem seems to be cured. Did some painting of the ground areas, and next time the wheels come off I'll be able to tell if at all there has been any rubber contact.

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