I'm the Quatrac 5 guy:roflblack: ….. The difference between those two are infinitesimal ….. just DON'T tell them it's for a SPYDER …. they probably won't sell it to you …. Discount tire has a ban on selling the Kumho Ecsta tire, to Spyder owners …..because so many people told them they were for their Spyder..... I fear this is going to be the fait of the Quatrac 5 .:banghead:..... Mike :ohyea: