I just recently purchased a set of 17" rims for my civic and i was wondering if by up-sizing you wheels will your spedometer read differently.

bill

 

what car do you have and what is the tire size

 

If you have a tire that has the same revolutions per mile as the original, you won't have any problems. For example, if you had 185/70 14 tires originally (860-870 revs per mile) it would be similar to 195/60 15, 205/50 16 or 205/45 17.

What happens is the the outside diameter stays the same but more of the diameter is in wheel instead of tire.

One word of caution... As you decrease the sidewall height by going to a larger wheel, your ride will become more harsh. Plus, if you increase the section width of your tire (205 vs 185) there may be a decrease in fuel economy. As the contact patch grows with the wider tire, the energy to roll the tire will increase. For most of us, this is not that noticable, but if you measure before and after with the same driving style, you may be able to see a difference.

 

i got the perfect link for you

http://www.1010tires.com/TireSizeCal...mp;vehicle=yes