Blackspire super pro xtr m960 middle ramped the engineered ring with modified shift gates and special profiles to allow 89 speed chains to shift flawlessly middle and outer chainrings have strategically placed stainless steel pins to further enhance shifting middle rings are cut from thick0 190 material for 8 or 9 speed drivetrains features anodized wlaser etched graphics 89 speed compatible stainless steel pins buy blackspire components from chain reaction cycles the worlds largest onli