Blackspire big ring protectorusing blackspires new custom mounting hardware the big ring protector attaches to the crankset outside of the large chainring to protect all three rings features made to protect the big ring from trail hazards and impacts weighs 40 less than previous model material cncd 6061 t 6 thickness 38 bcd 104mm finish anodized with laser etched graphics weight 193gbuyblackspire componentsfrom chain reaction cycles the worlds largest online bike store