Aero Style Chainring, designed for improved air penetration and reduced vibration thanks to its aerodynamic profile. Intended use for Road, Triathlon and Time Trial bikes. Compatible with all 10/11 speed transmissions and can be mounted on any 5 arm crankset (all brands) with a 110mm BCD. 100% CNC manufacturing in aircraft grade 7075 T6 aluminium alloy. For best results and shifting quality, we strongly recommend combining it with the Inner Syrius 11 or the Inner Zephyr, with a gap of between 12 and 16 teeth.* Material: CNC Aircraft Grade 7075 T6 Aluminium Alloy* Spacing: 110mm* Outer: 50-56 teeth* Compatibility: 10/11 speed* Colour: Matt Black* 100% French design and production