Sited either side of the rear wheel spindle, the EP Rear Spindle Bobbins are expected to take the initial impact in an incident. The durable materials and innovative design may save the swing arm and sprocket carriers from expensive harm. The nylon bobbin head and aluminium core are held through the rear spindle of the GSX-S1000 GT by a rolled-thread stainless steel spindle rod. The nylon is free to move with impact to reduce stress on the wheel and improve durability.