Keystone Classic - Tour de Dirt Return to Race Calendar Event Categories: Race Tour de Dirt Mountain Bike Previous Next Keystone Classic - Tour de Dirt 1900 OK-151, Sand Springs, Oklahoma, 74060 Get Directions DetailsSENTIR Racing Team presents the 2023 Keystone Classic. A proud participant event in the 2023 Tour De Dirt, the official USA Cycling State Mountain Bike Championship Series for Oklahoma. Website Registration Link Event Status: Scheduled Map & Directions Loading... No Records Found Sorry, no records were found. Please adjust your search criteria and try again. Maps failed to load Sorry, unable to load the Maps API. 1900 OK-151, Sand Springs, Oklahoma, 74060 Get Directions Previous Next