17" alloy frame 26" wheel factory price 5000pcs production capacity per month PARTSMaterialSPECframecromoly 4130cromoly 4130 T/T 28.60mm, D/T 28.60mm, seat tube: 29.1*520MM,forkcromoly 4130cromoly, threadless steer tube, 28.60mm handle baralloydrop bar, 390mm*22.20mm, core: 25.40mmstemalloyforged, 4 bolts, 4 bolt, ext.30mmgrip nillhead parts 10pcs, threadless parts, alloy capwasher alloy, 3*10mmB ...