... -arc welding. 7.Chainwheel&Crank: 12"--24T*89, 16"--28T*102, 20"--32T*127, ED/CP 8.Crank ... 12"-20" 13.Freewheel: 12"--16T ,16"--16T , 20"--18T 14.Chain: 12"--60L, 16"--70, 20"--84L 15.Mudguard: Iron ... ,0.5mm / plastic 16.Chain Cover: full , ... 4 SETS/SKD 85% ): 12"----2400/1150 SETS 16"----1900/800 SETS 20"----1500/580 SETS Other parts are ...