Thought I would make a post to show what the black RPF1's look like on a black MX-5! Just got them on, moving up from the stock 16 inch rims. I'm running 225 Star Specs on the RPF1's and it was a big difference going up from 205's. I feel a larger amount of grip and I've been taking spirited drives about 10-15 miles faster on corners without slip. Overall great purchase and I am much happier whenever I go on spirited drives.
I have eibach sways and springs. The lowering combined with the new tires needs a slight roll if you do aggressive driving to the point where your car is cocked all the way sideways to its limit. If you do normal daily driving mixed in with occasional spirited drives, then you should have no issue with clearance and bumps.
http://img38.imageshack.us/img38/3602/dsc02403s.jpg
http://img5.imageshack.us/img5/9608/dsc02408gu.jpg
http://img69.imageshack.us/img69/7088/dsc02404u.jpg
http://img22.imageshack.us/img22/7900/dsc02406s.jpg