Pontiac GTO Forum banner
1 - 3 of 3 Posts

·
Registered
Joined
·
27 Posts
Discussion Starter · #1 ·
With regards to the FACTORY tires and wheels, is there a heigth difference between the 17" and the 18" tires/wheels or is it okay to switch them off without changing the speedometer readings?
 

·
Registered
Joined
·
6 Posts
The overall diameter of a 245/45R17 is about 25.68", a 235/40R18 is about 25.40", the difference of .28" is considered by most to be nominal and OK to switch between the two sizes without recalibrating the speedo each time.
 
1 - 3 of 3 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top