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In Reply to: BMWcar magazine/ Wider tyres and wheels posted by Karl on February 23, 2000 at 19:14:10:
Coincidentally, I read the article you are referring to last night. In general, I agree with your comments, except that I think it is worth clarifying one point. My perception was that his concern was primarily focused on the width of the tire, not so much on the diameter of the rim. He stated that increased instability resulted from the tyres contact patch becoming too wide relative to its length. It is important to remember that the overall diameter of the tyre/wheel assembly does not change with plus sized rims, so to some extent this is a constant variable.
That said, I found it to be a very informative article. It was useful to get some perspective on this 'trend' especially the comments regarding the phenomenon being driven by style & marketing, NOT by tested performance data. I have been considering upgrading my rims/tyres and may still do so...but now I have a much better understanding of the relevant factors.
This article is one of a number pieces covering suspension related upgrades, all of which I have found to be very informative. It is an excellent publication, one that the fellows at 'Bimmer' should look to for inspiration.
Cheers,
Glen Klym
'89 E34 535i
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