Pure Fix 650C 45mm Micro Wheelset Flip-flop hubs with pre-attached 16T fixed cog and 16T freewheel cog for single-speed riding 650c wheels with super deep dish 45mm rims; double-walled aluminum Color matched rim and spokes; single accent spoke color; includes nylon rim strips to protect against tube puncture 120mm KT Quando hubs with 32 spokes each wheel Weight: 3.5 lbs. per wheel Flip-flop hubs with pre-attached 16T fixed cog and 16T freewheel cog for single-speed riding