Patented dual-sealing ProTech™ technology securely connects the two semi-axles inside the bottom bracket, and protects the BB bearings from ingress of water and mud, providing longevity of high performance, even in the worst riding conditions. A gravel-orientated development from Campagnolo's innovative and proven Ultra-Torque™ technology, the ProTech™ system's central Hirth joint features self-centring and self-aligning frontal teeth located in the middle of the crank where the ends of the integrated semi-axles meet.
The axles are fixed together with a single, protected oversized bolt, their precise pairing can even overcome the fractional misalignment that some carbon frames can include thanks to the tiny differences in tolerance in their manufacture. The ProTech™ crank system's torque transmission is as efficient as a single piece axle, and it's lighter. And, being better protected than other systems, it is also more durable. Oversized stainless steel bearing sit on the crank, outside the BB shell, for maximum stiffness, smoothness and strength thanks to greater axle rigidity from the increased axle diameter.