Blackspire super pro xtr m960 outer rampedthe engineered ring 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 features outer rings are cut from0 160 material for 8 or 9 speed drivetrains anodized wlaser etched graphics 4 bolt 44tbuy blackspire components from chain reaction cycles the worlds largest online bike store