Race Face SRX ISIS Bottom Bracket Size:68/73 x 108mm 2 will accept the STL-3K

2 will accept the STL-3K Back Rest Kit

the HHP-3 is designed to install all sizes of head cups (1" to 1-1/2") and one-piece bottom bracket cups

base mounted analog gauge with air release button to help dial in the exact pressure

Can also use the 39T Inner Chainring from the Shimano Dura-Ace FC-9000

Race Face SRX ISIS Bottom Bracket Size:68/73 x 108mm 2 will accept the STL-3KRace Face SRX ISIS Bottom Bracket CNC machined, heat treated, hollow chromoly M15 spindle. Shot peened finish for fatigue strength. Forged & CNC'd aluminum cups & reinforcing sleeve. Single row, full ball, sealed cartridge bearings. Low friction labyrinth spindle seal keeps out contaminants & increases bearing life. Newly improved extreme conditions bearing grease. 64 ball bearings in each bottom bracket. Fixed cup spacer (2. 5mm) allows BB to be used