Cane Creek HD Series Bearing Kit Hellbender Bearings If you have a Specialized mountain bike with an FSA-spec headset and you want to upgrade your bearings, you're in luck. The Cane Creek HD Series Bearing Kit is a Hellbender Stainless Steel Cartridge Bearing Kit designed for the FSA-spec Specialized mountain bikes. It has a 42mm upper and 52mm lower bearing and comes with a crown race. Features Designed for Specialized MTBs with FSA-spec headsets Comes with a 42mm upper and 52mm lower and a crown race Cane Creek part number: BAA2297 | Cane Creek | Hd Series Beaing Kit 41. 8-45X45(Fsa)/52-36X45/110 Crownrace 52/40