Because the Tires it came with Bridgestone RE50’s are nearly impossible to get and stupidly pricey for a 17 oh and to add the one drawback on the FiST is stock the chassis was never designed to accommodate a 17 inch wheel so you have exactly two tire sizes that fit 205/40 17 and 215/40 17 without really rubbing. A lot of FiST owners go down size wise to find tires and or better ride because more sidewall. Stock FiSTs ride hard. Did I mention RE50 is a 200TW tire stock . Did I mention how much insane grip I get running 200TW lol. You step off 200TW tires on these cars and it kind sucks as it gives up a lot of grip. My Grey on has Indy 500’s on it as the cheaper tire compromise the previous owner put on it. They suck in comparison , sure for the uninitiated they might be fine but ya drive the car like I do and you will notice. Anyways I have driven the FiST daily for going on over 5 years now. It’s would be kinda nice to drive something else. A rabid pokémon gets tiring some times in traffic lol. Ya my FiST is not stock it’s got a Turbo Technics S280 Turbo tuned by Tune+ pushing 284 whp. 🤣