1.NABE: Aluminium hubs. This wheel has 2 front and 4 sealed rear bearings, which are very smooth and support 811 speed cassettes. Quick release. 2.FELGE: Ultralight doublelayer aluminum rims with rivets, 6hole disc brake, Schrader valve. 3.24/26/27.5/29 INCH MOUNTAIN BIKE WHEELSET: Made of highquality aluminum alloy with spikes, strong and durable. 24 inch: Front wheel weight 905 g, Rear wheel weight 1040 g, 26 inch: Front wheel weight 945 g, Rear wheel weight 1070 g, 27.5 inch: Front wheel weight 985 g, Rear wheel weight 1110 g, 29 inch: Front wheel weight 1030 g, Rear wheel weight 1155 g. 4.SPEICHEN: Round steel spokes make your wheels very strong and durable and withstand long rides or races well. Number of spokes: 32 for front and rear wheel.