BRAND NEW BMX racing 5 bolt lightweight polished alloy chainrings, for single speed 1/8" chains. 36T/39T/40T/44T/45T Colour black (These are identical to Econoline chainrings but with no branding). All chainrings have the following dimensions: Central bore hole diameter: 24mm Distance between inner circle oval bolt holes: 40mm Distance between outer circle oval bolt holes: 55mm
