Shimano Dura-Ace 12 Speed Double Chainset Heart Rate Monitor Its ABS shell and low

Its ABS shell and low sides provide you with the protection you need when riding trails

Set comprises of two pulley wheels and is a genuine Shimano replacement part

with a light water-resistant treatment to protect you from showers and road spray

Virtually indestructible Grilamid TR-90 nylon frames keep the supremely stylish Crit lightweight

Shimano Dura-Ace 12 Speed Double Chainset Heart Rate Monitor Its ABS shell and lowDescription The HollowTech II 12 speed Dura Ace chainset offers the optimum balance of light weight and rigidity, making it the global choice for road racing's elite riders Hollow outer chainring, giving vast improvements in rigidity and increased weight savings The hollow outer chainring has essentially removed outer chainring flex, hugely improving shift performance making it precise even under high load These industry leading HollowTech II 4 arm