The HollowTech II 12-speed Ultegra chainset with integrated power meter offers an ideal balance of light weight and stiffness, making it the perfect choice for both enthusiast and competitive riders.

• Accurately calibrated strain gauges are integrated inside the crank arm, which provides a stable measurement system through rotation from both sides for exact data
• +/-2% accuracy of strain gauge measured power
• Bluetooth and ANT+ with wireless firmware update and data acquisition system
• Easily rechargeable integrated battery with a fully waterproof, reliable electric system
• HollowGlide hollow outer chainrings greatly improve rigidity by virtually eliminating outer chainring flex and hugely improve shift performance, even under high load.
• The chainring teeth have been developed to work in conjunction with 12-speed HG chains, providing increased contact for greater efficiency and improved power transfer.
• Industry-leading HollowTech II cold forged 4-arm hollow cranks evolved for maximum rigidity while reducing weight.
• Wide gear pitch spacing increases clearance between the chain and the leading teeth to provide compatibility with O.L.D. 135 / 142 mm frames.
• A wide range of chainring options and crank arm lengths are available to meet the needs of all riders and racing disciplines.
• HollowTech II integrated bottom bracket uses a wider bearing placement and larger axle diameter for increased stiffness and efficiency.
• HollowTech II integrated bottom bracket seal design has minimal bearing interface, ensuring smooth rolling and increased durability(sold separately)