Brand: mi.ximProduct Name: HB20 bead hubMaterial: aluminum alloy shaft skin + steel towerStructure: the ball， quick disassembling lock.Specification: open file before 100MM， after 135MM， 32 hole， supports the 7/8/9/10 supeed card (7 speed freewheel need to add about 3 mm washer).Brake disc brake: six holes， adjacent hole spacing 27.5 mm， 50 mm of the pitchWeight: 858 g /setall with Quick-release.