Quote:
Originally Posted by Solo2EG
Not if you keep the same OD (which is what you should do) For example Civics come with 15's (Hybrid & DX-G) 16's (LX & EX) & 17's (Si) but they all have the same outside diameter so that the speedo remains the same. (in fact the 16's are a hair taller than the 17's)
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I believe going from a 17" wheel on the Si to my 18" wheel with 225/40's changed my Speedo to read .5mph fast which is acceptable. It seems on modern cars they should allow you to "set" your wheel and tire size so that your ECU can compensate and calibrate your ECU's. Oh well..