Wheels Manufacturing BSA Bottom Bracket - Shimano Hollowtech II Spindle ABEC 3 Green MFPN=HBSP421B 13-tooth upper and 19-tooth lower

13-tooth upper and 19-tooth lower aluminum pulley wheels with Grade 3 Silicon Nitride balls

Quickly and easily determine the bearing that will fit in integrated headtubes and find replacement bearings for internal headsets

Super lightweight and breathable 3/4-length tight provides seamless comfort

30 Folding 60tpi Single Compound Black

Wheels Manufacturing BSA Bottom Bracket - Shimano Hollowtech II Spindle ABEC 3 Green MFPN=HBSP421B 13-tooth upper and 19-tooth lowerWheels Manufacturing BSA Bottom Bracket Shimano Hollowtech II Spindle ABEC 3 Green. BSA Bottom Bracket TECH SPECS BB Shell Width (mm) 68 BB Shell Width (mm) 73 BB Frame Interface English Bottom Bracket Shell I. D. 1. 37 Defined Color Green Spindle Interface Type Shimano Hollowtech II Spindle Interface Type RaceFace EXI Spindle Interface Type FSA MegaExo Weight 105