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Posted by wodcutr 
April 26, 2009 01:52PM
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Bob P 325is 88
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daniel
if by correct "larger" size, you mean larger diameter, then sure, but the diameter of 215/60-14 tires is larger than the proper diameter for the e30.

No, I mean that the 215/60-14 size is closer to the 195/65-14 size diameter than the 205/60-14 size, albeit on the high side. The 205/60 dia. is off by a greater amount, but on the low side. In other word the speedometer is less off with the 215 size than with 205 size, showing slower than "real" speed. However, when factoring the already 3% "optimism" of our speedometers, the using 215/60s corrects that nicely to show "real" speed. With the 205s errors the indicated speed is even more optimistic!

oh ok, thanks for clarifying. I guess I am so used to having a low car that I never consider increasing the diameter of the tire, even if it is closer in size to the original size than a smaller tire.


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