TA Inner Triple Chainring (74mm BCD)This sturdy heat-treated aluminium alloy chainring is an ideal replacement to fit to your 9/10 speed MTB crankset. It features a BCD of 74mm and provides top-notch chain engagement for more speed and less fatigue. Finally, what’s most impressive is it features traditionally lathe-cut teeth for a smoother and faster shifting experience.Features: Material: 7075 T6 Aluminium Alloy Use: MTB BCD: 74mm Speed: 9/10 speed Genuine TA replacement partBuy TA Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.