ordered 18x9 with 255/35 up front and 275/35 in the rear...my car currently has 17x9 with 245/45/17 all around ( i believe may be 245/40 im at work and dont remember) what i want to know is i live in upstate ny and the roads are mostly good but have a few potholes etc around...how much different is the sidewall height of the new tires vs the old? im never good at figuring that out...just dont want to have to worry about bending the wheels all the time...if they are about the same as the 17's then im not worried. thanks