Because the brake calipers are much larger there can be issues with the spokes hitting them (one dealership already borked me on this while chasing down a problem).

Can I put any 18" OEM wheels on there? Probably not 17"...

Any suggestions as what will fit and would be suitable for a set of all-season tires? The standard 18/19 combination wheels that came with the grand touring model are being relegated to summer only.

 

no no on the 17s. 18s should be fine all around for your brakes. Rears brakes are bit smaller than the front ones.

 

Everything but the OEM 17 will fit, unless you run a 5mm spacer , then the 17's will also fit

 

Look at OEM wheels specs. Compare width and offset. That will give you a good start.

 

why no no on the 17's? the oem 17's fit over the oem brembos..