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Old 12-05-2012, 01:28 PM
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Tanning machine Tanning machine is offline
Using SPF 45
Location: Washington, D.C.
Join Date: Feb 2002
Posts: 3,614
Mein Auto: 2004 330Cic
Originally Posted by Fleurkjiwi View Post
When changing tire sizes, always maintain a diameter that is as close as possible to the original.
There are a few of these calculators out there, but here's one that allows you to play with various sizes:

Your goal should be to get the revs/mile (or circumference, or diameter) as close as possible.

Agree with the points about getting a dedicated wheel/tire package. As a general matter, for snow tires you want something narrower and for winter/rough roads something with a higher profile. Those two things are usually easily combined changes that can get you pretty close to the same overall circumference.
Tanning Machine I: 1989 325iC (Salmon Silver/Black, Heated Seats, LSD). 7/26/1989-11/1/2003.
Tanning Machine II: 2004 330Cic (Silver Gray/Natural Brown, SP, PP, Heated Seats, Xenons). 8/29/2003-present.
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