Are FX owners satisfied with the size and quality of the stock tires that come with their bike? I believe the FX-1 and FX-2 come 700x35 tires. The FX-3 and FX-4 come with 700X32 and the FX-5 comes with 700X28. Are you satisfied with the stock tires? If you upgraded, what did you buy and were you satisfied with the upgrade? Thanks for your input.