The Definitive tire size chart
#3
Wouldn't switching to coilovers eliminate the problem? I'm planning on Malibu struts and see how things clear. I could index the spring and cut the outside portion off for a few inches of clearance. I would weld on a face plate or some sort of gusset
#5
#6
Hello... I just installed Michelin Primacy 245-45-18's on my Wife's 2008 HHR SS with factory SS wheels. Its a close fit, we have had zero issues. It has changed the dynamics of the vehicle with a more comfortable ride, quieter, friendlier handling and looks a lot better with a more proportionate sized tire. Hope this helps...Maurice.
#7
How would coilovers change the position of the lower spring seat? There is a fixed distance from the center of the axle to the spring seat, coilovers would change the distance from the lower seat to the upper seat. The only way to force a bigger tire in is to increase the wheel offset, or use wheel spacers. Both of those options will change the steering geometry, causing tire wear and different (probably dangerous) handling characteristics.