TK8670CM
Very soft running bottom bracket
square taper ISO Cr-Mo hollow axle
sealed bearings, aluminum bearing shells
BSA = for 68mm bb shells, threading 1.37" x 24 tpi
ITA = for 70mm bb shells, threading 36 x 24
with rubber gasket, carbon sleeve in the middle part
BSA 68mm
ITA 70mm
Incl. hex crank arm bolts