Tire/speedo Question


New Member
Mar 7, 2003
Sammamish, WA
Does anyone know whether the speedometer reads from the front tires, the rear tires or both. I'm going to a 18' rim (285/35/18 or 305/35/18) at the rears, but am going to keep the 17's (245/45/17) up front. The tire calculators I've looked at show that the speedometer will be very slightly off, but I don't know if the calculator's assume all four rims/tires are the same size. :shrug:

Is anyone running a similar set up and if so, how accurate is your speedometer?
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