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Re: Winter wheels (archive)
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Posted by Jason on June 24, 2000 at 14:51:15:

In Reply to: Re: Winter wheels posted by Not too wide tires on June 24, 2000 at 06:20:44:

: Maybe you could fit 16" wheels, but for snow, it would be better to use thin tires.


I have this nifty little shareware program that compares tire/wheel sizes. Taking a look with the stock tire size 225/45R18 front and 255/40R18 rear here are the conversions for both a 17" and 16" with the 225 on all 4's. I imagine BMW will most likely recommend with the 17" 225/50R17 for the closest calibration. The 16"s spin 0.88% and 1.10% faster than stock which may cause calibration probs versus 0.44% and 0.67% on the 17". 18"s aren't an option because no one makes winters in those sizes.

C:\th>tiresize 225/45r18 225/50r17
Specification Circumference Revs/Mile Difference
225/45-18 81.59in 776.5 0.00%
225/50-17 81.24in 779.9 -0.44%

C:\th>tiresize 255/40r18 225/50r17
Specification Circumference Revs/Mile Difference
255/40-18 81.78in 774.8 0.00%
225/50-17 81.24in 779.9 -0.67%

C:\th>tiresize 225/45r18 225/55r16
Specification Circumference Revs/Mile Difference
225/45-18 81.59in 776.5 0.00%
225/55-16 80.88in 783.4 -0.88%

C:\th>tiresize 255/40r18 225/55r16
Specification Circumference Revs/Mile Difference
255/40-18 81.78in 774.8 0.00%
225/55-16 80.88in 783.4 -1.10%

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