help with tire change on 2005 gto

So i just put some 255/60/15 et street r drag radials on my gto, I want to change the size in the editor but it is very confusing to me. what exactly do i have to change? i see revolutions per mile for the vss, do i have to change this to my new revolutions and is there any other thing i have to change? Thanks

Can you use the gear/tire wizard under the edit tab?

Yes!!!! that is awesome! thank you for that secret i would have never figured that out. Your the best.