Avenir Shimano Ultegra/Mavic Open Sport 32H QR Double Butted Alloy Nipple Spokes Rear Wheel with 9/10 Speed Cassette Compatible Hub (Silver, 700 x 20mm) Mavic open sport alloy double wall rim Quick release Shimano Ultegra hub Spokes are 14-15g double butted stainless steel 9/10spd cassette compatible hub Rim size is 700 x 20mm wide