MULTI SPEED GROUP SET: Including 9 speed freewheel, hollow integrated crank, rear derailleur, chain, tail hook and other accessories
ALUMINUM ALLOY CRANK: The crank is made of aluminum alloy, sturdy and light, has stylish look, strong axial strength, and wide compatibility
DIY YOUR BIKE: This set is great for family or friends who like cycling, allowing them to DIY their own bikes and upgrade performance
RUST PREVENTION: The Speed Groupset is multiple layer electroplated, which is rust prevention, with drop gear design, ensuring smoother speed change
STEEL PLATE: The freewheel adopts high strength steel plate and has been quenched, tempered and hardened, very sturdy