Quote:
CD --- tire & rim size (for a 1991 BMW 318i)
0.293 --- 155 R 15; 5 1/2 Jx15 St. with wheel covers
0.294 --- 165 R 15; 61 2 Jx15 St. with wheel covers
0.297 --- 175/70 R 15; 6 Jx15 St. with wheel covers
0.305 --- 185/65 R 15; 61 Jx15 St. with wheel covers
0.311 --- 205/60 R 15; 61 2 Jx15 St. with wheel covers
0.314 --- 205/60 R 15; 7 Jx15 LM
0.319 --- 225/55 R 15; 7 Jx15 LM
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From thread:
http://ecomodder.com/forum/showthrea...g-cd-7475.html
The problem is you're changing multiple variables when you change wheels/tire size. Is the replacement tire going to have better or worse rolling resistance? How will you know?
It's a bit of a crapshoot.