Features of EP Front Spindle Bobbins Crash Protection for the Kawasaki Z900 Moulded nylon bobbin Aluminium core with a stainless steel spindle rod All other fastenings included in the kit Simple to install through the front wheel forks Replacement bobbin heads can be purchased separately What is Spindle Bobbin Crash Protection? Fitted through the front wheel fork of the Z900, EP Front Spindle Bobbins offer crash protection for the forks, brake calipers and spindle retainers. Standing out from the front wheel, the nylon bobbin and aluminium spacer will likely be the first to take impact in any incident. The nylon slider uses Evotech Performance’s innovative design and is able to rotate on impact reducing wear and damage.