All models listed with multiple axle sizes separated by a / include adapters for use with each axle configuration listed. Pairs using a - in the axle column refers to Front - Rear applications. Item Specifications: Size: 27.5in, Type: Tube Only, Brake Type: RIM, Axle: B/O 3/8, Width ID (mm): 19, O.L.D.: 135, Ft / Rr / St: RR, Rim Model: WEI 519, Hub Model: W/M MT-5000, Wall: Sgl, Hub Color: Blk, Spoke Type: 14G BK, Valve: SV, Rim Color: Blk MSW, Gears: 5/6/7s FW, Spoke Count: 36H,