B-Labs / Bionicon Oval Chainring 104 BCD 32t virtual range - elliptical shape simulates -2 / + 2 teeth as you ride Narrow/wide alternating tooth profile for ultimate chain retention offset chainline - mounting position to optimised for 2 or 3 ring cranks direct thread mount - no more 2 part chainring bolts or bloody knuckles! high-strength 7075-T6 Aluminium alloy black anodized laser finish