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