Im considering putting larger wheels on my sierra. It currently has 16" wheels. And am considering putting 17" denali wheels on that will increase the overall diameter almost 2 inches. Can anyone tell me how much this will affect my spedometer? And how I can get it adjusted and how much it costs?
Thanks

 

A good tire store should recal it for free if you buy tires...your selling gmc dealer should do it at least close to free.
It should be about 25 bucks max

 

Go to tires.com (Discount Tire website) and hunt down the tire calculator. You can plug in the numbers of your old tires and the new size and it will tell you the difference between the two.
Ruben
PS; I don't work for Discount!