Campagnolo pedal drive housing made of aluminum for the Ultra-Torque system, ensuring maximum smoothness and robustness for the axle of the pedal drive housing. Completely redesigned for faster, more intuitive, and precise assembly, thanks to the patented QCK-Tech technology. QCK-Tech: This advanced system features a patented external seal designed to effectively protect the ball bearings from external influences such as water, mud, and sand. The central axle, made of reinforced polyamide with fiberglass, ensures perfect sealing and prevents any internal contamination. The pedal drive housings house oversized stainless steel ball bearings that are directly coupled with the Ultra-Torque half-axles, which are firmly integrated into the crankarms. For BB386 PRESS-FIT QCK-TECH 86.5x41 mm. Weight approx.: 52 g.