A replacement driveshell for Classic and ISO SSP (singlespeed) rear hubs. Available as a bare driveshell requiring the transfer of your original driveshell internals into the new driveshell as well as a complete assembly with bearings ready to drop in to your existing SSP rear hub. PHB548 - Bare driveshell. Will require the Hub Service Tool or Universal Hub Tool to transfer the driveshell internals. PHB555 - Complete SSP driveshell assembly with both the inboard stainless steel ball bearing and the outboard needle bearing. Please include in your order notes what the bearing race spec is on your axle so we can match them.