I have 6 Goodyear 275-40-17 GSCS "R's", All have been heat cycled and used for a single track session at Race City here in Calgary. The 4 wear indicator circles found across the contact patch are clearly visible and both grooved strips in the tyres are clear and visible. Would be very useable for Solo 2 or autoX. Asking $100.00 each and will sell in pairs for use as rears. Came off my 95 GTS 302/375hp.