xjdmchino

If I install new wheels that is 20x10 with like 255/30/20 would I have to recalibrate my speedometer since they're bigger then the oem wheels. If so can I go to the dealer and have them recalibrate or no ?

justnspace

iTrader: (1)

no, that's not how it works.

the goal is to match OEM tire dimensions. if not, your speedo will be off.
so, in order to get as close as to OEM tire diameter, you will need to play with a tire calculator.
my favorite one is from 1010tires.com
Tire Size Calculator - Tire & Wheel Plus Sizing

enter in OEM tire specs, then input aftermarket tire specs and compare the two.
if diameter of aftermarket is GREATER than 3%, the calculator will warn you and show you by how much your speedo will be off.

rocket_pup

If you go 20", that's a +2. Use the calculator the other post had. Your speedo will not be 100% correct, but it should be close... within 2 or 3 mph.