hi, i was wondering how to adjust the speedometer once i go for bigger wheels? im planning on going with 17s with about a 45 width.

 

As far as I know, you can't.
But what the hell do I know?

 

you should try to keep them them the same diameter... if you get bigger wheels. you just get thiner sidewall tires. the total diameter will stay the same if you pick the right size.

 

A little bit.
You would have to adjust the speedo by swapping the driven gear on the speedo cable. I don't know of any company that makes a different gear, though.
You can retain proper operation of the speedo by simply choosing the right tire size.

 

This will help you figure out how to adjust the speedo, based on gear size:
http://members.ij.net/mrmazda/speedo.html

 

thanks guys. im going to go with bigger and also wider wheels, cause the power ill be making i will need to. i dont want to be limited to tire size just to keep the speedo working right.

thanks icemark