700C, 60MM Depth Clincher Rim Style With Basalt Braking Surface, Classic UD Matte Appearance. Aero Spokes, 2 Cross. Hubs are Six-Pawl, for Shimano 8/9/10/11/12 speed cassette. UCI Approved. Sram PG1070 10 Speed Cassette 11 x 28 Tooth. Continental Grand Prix 4 Season 25mm tires. Mark.