Caliper Clearance vs Heat Dissipation
 

I just bought a used set of 17x8 RPF1's to use as a second track option. Hoping that lighter (34#s) and slightly narrower is quicker. My concern with test fitting is the tight clearance between the caliper and the wheel barrel possibly creating additional heat. These 3 pictures are my 18" street wheels vs the 17" Rotas and 17" RPF1s.

http://i63.tinypic.com/ao2tdk.jpg
http://i65.tinypic.com/f9ghhl.jpg
http://i68.tinypic.com/2hec8qh.jpg

Won't be an issue. Just be aware of the location of the stick on weights so they don't get scraped off due to clearance and put heat-reflective tape (aluminum) tape over the weights. Otherwise the heat can reduce their sticky and they come off so the reflective tape keeps that from happening.