Re: Will wheel and tire size (+1) affect speedometer reading?
Just checked mine
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
245/60-18 5.8in 14.8in 29.6in 92.9in 682 0.0%
265/40-22 4.2in 15.2in 30.3in 95.3in 665 2.6%
How much is 2.6% anyways?
1999 Jeep Grand Cherokee Laredo I6 4.0 227k miles SOLD 10/13/11
2009 Jeep Grand Cherokee Limited V6 3.7 29k miles
SRT8 Front/Rear bumpers, SRT resonators/tips, Flowmaster Super 44 series muffler, KnN 77 series CAI, 8000k HIDs Lows/Fogs, Brilliant Black SRT Grill, 22" Gloss Black SRT Reps, 20% Tints, and a lot more to come =]