Aluminum 20T gear pulley on main layshaft drives right back belt. CNC-machined from premium lightweight Swiss 7075 T6 aluminum, hardcoated for extra durability and long lifespan and possesses been strategically lightened. Rotating mass is reduced with no need to reduce power or durability. Belt pulley exists with braking system disk adapter and includes factory-pressed pins (non-replaceable). Factory pre-assembled.