Hi Mike here ….. there are dozens and dozens of New folks on this site now and may not be aware of this …. If you decide to use Auto tires on your Spyder ( and most here are doing this ) …. Tire sellers usually will not sell you a Car tire if you tell them it's for a Spyder …. They are afraid of legal liability issues, even tho Any Auto tire is at least three times as safe as a Kenda or Arachnid..... so if you Must speak to a salesman tell them it's for a used car you just bought and this is the Brand & Size that's on the car Now …. and you need to re-place one or two and you want them to match or say it's for a dune buggy and that's what are on there now ….. If you want accurate info about tires ASK HERE …. not a tire sales-person, they have NO knowledge about tires used on Spyders ….. Discount tire has pretty much RED FLAGGED the Kumho Ecsta in 225/50-15 for the aforementioned reasons.........good luck …. Mike .......PS - Dis-claimer, what you put on your Spyder is your decision not Mine ......