Blackspire superpro chainring shimano xtr m985when you are using a blackspire product you are not riding with a low grade component so when you make the long drop or even a short one you have the confidence that your equipment will not fail their raw materials are aircraft standard which is of the highest quality cncd 7075 t 6 the engineered ring modified shift gates and special profiles to allow 9 and 10 speed chains to shift flawlessly middle and outer chainrings have strategically pla