BikesXpress double-walled aluminum wheelsets are size 700C with a 50mm rim depth, front and rear. Our wheels include name-brand and laser-etched KT Quando hubs. Our rear wheels include flip-flop hubs with a pre-attached 16T fixed cog along with a 16T freewheel cog for single-speed riding. Our front and rear wheels are 32 spokes each. All wheelsets include nylon rim-strips to protect against sharp edges and prevent tube puncture.