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      09-18-2012, 03:42 AM   #4
BimmerPost Supporting Vendor

Drives: E30 M3, F10 M5
Join Date: Jun 2009
Location: Bay Area, CA

iTrader: (6)

I am currently out of the country so it will be hard to provide additional timely responses/posts to your question until I return, but I'm sure the other staff will provide a follow up via email to the question you submitted.

I'm sorry to hear you're having vibration issues with your wheels, I understand that can be frustration to trouble shoot, and determine the cause.

You mentioned light use for a year. Many variables can cause a wheel to be damaged from use. I'll explain below what may have happened here.

The traditional staggered combination we provide for the E9X M3 is 9.5" front and 10.5" rear. If this is the combination you have, then 245/265 is undersized for the wheel width (stretched). This is not the tire sizes we recommend to for this fitment, as we traditionally recommend 265/285 for those wheel sizes. We have customers who run narrower sizes on our wide wheels but we point out that it is not ideal, and that the tires will be stretched. This combination is usually done when reusing the tires from a previous set, and we point out that it is a short term compromise. Michelin PS2 tires are also known to run very narrow compared to other brands/sizes and they have a soft sidewall. The new Michelin Super sport (PS2 replacement) is noticeably meatier. Undersized tires provide less protection for the wheel rim, which increases the stress they go through. When a bump or pot-hole is hit, more stress is passed through to the wheel. Run-flat tires for example also stress wheels excessively, which is why it's common for brand new BMW wheels to crack on new unmodified cars (the 1 series is a good example of countless cracked wheels). It's very possible that an impact caused an issue here.

It's difficult to determine the cause of your issue as it's a recent occurrence that started after a spirited drive, and there is no way of determining what the wheels have really been through.

You describe wheel hop that can be detected by the technician on the balancer. Can you be more specific regarding the issue you're experiencing? Is the wheel lip bent, or is there another way you can define the characteristic of the movement?

Please provide as much detail as you can. Once we have a better understanding of the issue, we can determine if this is a warrantable issue, in which case we will provide replacements at no cost to you. If the wheels were vulnerable to extra stress due to undersized tires, it's very possible they were damaged from use that is not covered. If that is the case, we will still be able to provide discounted replacements.

I should be back in the office and available to follow-up on Wednesday. I apologize for having to provide a response that makes assumptions about your possible circumstances, but I wanted to provide a timely response.

Thank you for your understanding,

-Eddy P