... Chainwheel & Crank, Sunrun 7 speed derailleur, with fender and carrire 20"Steel folding bicycle, steel frame and fork, 42T Chainwheel & Crank ... (WL-2051S)Specifications: 1) bicycle Frame: 20" high carbon steel folding frame 2) bicycle Fork: 20" steel 3) bicycle Handlebar: Alloy 4 ... " x 42T7) bicycle Hub: steel8) bicycle Rims: Alloy9) bicycle Tires:20" x 1.75" A/V 10) bicycle derailleur: Sunrun, 7 ...