TruVativ Howitzer for Truvativ cranksets that are designated Howitzer compatible.Forged aluminum cupsCompatible with TruVativ cranksets that use the Howitzer BB51mm chainline matches 113mm spindle with conventional crank, 56mm matches 118mmCR2545 is for 83mm bottom bracket shell and CR2544 is for 100mm shellSealed oversized cartridge bearingsTeam features CNC"d Alloy cupsXR model has forged aluminum cupItem SpecificationsWeight365gBB Thread TypeEnglishSpindle Interface TypeTruVativ HowitzerSpindle Length0mmBB Shell Width73,68mmDefined ColorSilver