Wheel Set, Front and Fixed Gear Flip-Flop Rear Wheels 45mm Includes Tires and Inner Tubes Front and back 700c fixie wheels 45mm deep v, double-walled aluminum Chaoyang 700*25c tires & tubes Flip-flop hubs with 16t fixed cog, along with a 16t freewheel cog for single-speed riding Includes nylon rim-strips to protect against sharp edges and prevent tube puncture