Homestar1217

I'm getting some new rims. I have the LS Coupe, and I'm getting 17"x7.5" rims and I'm going to put 215/45 tires on them. What I'm wondering is will the dealer adjust the ECU so that my speedometer and odometer aren't off. I know that's going to be a problem, and I know it's going to be at least a little higher off the ground. Firestone has already told me that they can't adjust the computer, so I want to make sure someone can before I start the project.

thehov

Ummmmmmmmm.......... You are totally over thinking what your doing and they seem to be idiots at that firestone.....

You dont need any adjustments, you are plus sizing......... everything is the same........ end

mike25

well it will either be the same or i.e. when you go 55mph youl be going 53mph....so your pretty much going to be fine as said

Homestar1217

yeah ok speedometer=fine. what about the odometer, that's kind of important...

thehov

odometer will be the same....

Lets say you have an 07 Cobalt LS and the stock size is 15" rims with 195/60/15 tires and you decide to go with +2 sizing which would be 17" rims with 215/45/17 tires. You are maintaining the same rolling radius of the 15" setup which doesnt effect anything with speed(+/- .04mph) and you odometer stays the same..... Your car does not raise up or lower what so ever....