DetailsHowitzer:~ Heat treated CrMo Howitzer-spline/taper spindle with M12 (crank mount) thread bore and CNC aluminum cups with plastic shell-spacer. Fits 2006+ Holzfeller and Hussefelt cranksets with Howitzer-specific bottom bracket interface. Dual, oversized 'external-type' sealed cartridge bearing design. Versions for 50/51mm chainline at 135mm wheel spacing; 56mm chainline at 150mm wheel spacing. 365g (51mm chainline).