Quote:
Originally Posted by Vekke
In the ID3 155/70R19 were about 4% better than stock 215/55r18 tires. Both were with fully blocked air cooling holes. 215 were A on rolling resistance, but the narrow ones one C.
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OK, where did that 4% info come from?
If I use my RR by size calculator (
Barry's Tire Tech), I get a 2.02% difference in favor of the 18".