I'm thinking of getting a set of track-only rims/tires for my GS & was wondering if anyone else has done this. Of course, the GS now has a 19" Pirelli P-Zeros but, an owner of a tire store recently told me that Toyo Proxes R-888 R series tires mounted on 18" rims would be the best setup he would recommend. He also said to not worry about what the rims look like but, to get the cheapest, lightest I could find. I don't know anything about lightweight rims. Tips?