For exploring beyond the usual roads and trails SHIMANO GRX RX570 wheels deliver reliable performance for diverse riding conditions. Featuring wider 21.6 mm internal rim widths the GRX wheels can accommodate robust gravel tubeless tires and feature CENTER LOCK disc brakes and 12 mm thru axles. Built to withstand the rigors of gravel riding the RX570 wheels are available in both 700C and 650B wheel sizes.