Campagnolo aluminum bottom bracket housing for the Ultra-Torque system, guaranteeing maximum fluidity and robustness of the bottom bracket axle. Completely redesigned for faster, more intuitive, and precise installation, thanks to the patented QCK-Tech technology. QCK-Tech: This advanced system integrates a patented outer seal that effectively protects the ball bearings from external influences such as water, dirt, and sand. The central axle made of fiberglass-reinforced polyamide ensures perfect sealing, thus preventing internal contamination. The bottom bracket housings house oversized stainless steel bearings that are directly connected to the Ultra-Torque crank arms, which are firmly integrated into the cranks. For BB386 PRESS-FIT QCK-TECH 86.5x41 mm. Weight approx.: 52 g.