Another worry of mine is the effects of mounting different size wheels...

My considerations are :

1) what will the WEIGHT difference in the wheels do?
2) will my speedometer reading be incorrect?
3) will this also effect my odometer reading?

I want everything to work and I realize the diameter has to be identical to the stock wheel to not throw anything off. (correct me if I'm wrong). I was already told by a mechanic I work with not to bother cause it will mess things up...but I'm sure there is a right way to do this...

I need your recommendations on the right tire size!!!

Thanks
Jon