Blackspire defender bash guard for sramprotection for use with truvativ 104bcd 2x cranks that do not allow a traditional bashring features 14 thick compatible with bb30 and gxp cranks includes mounting hardware material cncd 6061 t 6 bolt pattern 104mm size 36t or 38t max finish anodized with laser etched graphics weight 110g38t 100g36t buyblackspire componentsfrom chain reaction cycles the worlds largest online bike store