Bastrumpedal Dyna-Sync TwinFeatures: Optimized Transmission Design By precisely positioning and aligning the contact point transmission angles between the cam, direct link and footboard, we achieved the perfect overall balance of power speed feel. Dual Linkage To convert rotational motion force from footboard to cam, we developed a sturdy double link cam connection system that holds the rotation axis bearings equally from both sides. This produces almost perfect energy transfer