Alu 20T gear pulley on main layshaft, drives right back gear. CNC-machined from premium lightweight Swiss 7075 T6 aluminum, hardcoated for additional durability and durability and possesses been strategically lightened. Rotating mass is paid down without having to sacrifice power or durability. Belt pulley is added to braking system disk adapter and includes factory-pressed pins (non-replaceable). Factory pre-assembled.