Compare the allowed OBW of the crank to our bottom bracket OBW.If the allowed OBW of your crank is more than the OBW of our bottom bracket, our bottom bracket will work but you may need spacers.
If the allowed OBW of your crank is less than the OBW of our bottom bracket, our bottom bracket will not work (it’s too wide for the crank).When in doubt, start with fewer spacers than you think you need so you don’t crush and destroy your bearings! Most cranks these days have an adjustable bearing preload collar on them that can accommodate slightly wider/narrower OBW’s than their target number, but again, you’ll need to check with your particular crank’s manufacturer. See the chart below for the “OBW” (Outer Bearing Width) of each bottom bracket and compare that to the allowed OBW for your crank (ask the crank manufacturer for this, not us!). On 86mm shells, use one 2.5mm T47 cup spacer on each side.No spacers needed with M30 and A30 cranks on 92mm shells.No spacers needed with R30 and G30 cranks on 86mm shells (92mm shells are too wide).Designed to be used on 86mm or 92mm wide bottom bracket shells.Internal BB sleeve part #BBSLV available under Parts>Bottom Bracket Parts.Seals should sit directly against the bearings, with the part numbers (molded into the seal) facing out.30mm White Industries M/A/R/G cranks as well as other brands of 30mm spindle cranks.We offer them with four different bearing sizes to help you fit your favorite crank to your favorite bike. sourced 6061-T6 aluminum and feature Enduro stainless steel bearings or Enduro XD-15 ceramic bearings where available. White Industries internal T47 style bottom brackets are made here in our shop with U.S. If you have a 68mm or 73mm wide T47 bottom bracket shell on your frame, you will need one of our “external” T47 bottom brackets to work with our 30mm M/A/R/G cranks. The “internal” designation on this bottom bracket refers to the fact that the bearings sit “inboard” of 86mm and 92mm wide bottom bracket shells, as opposed to our “external” T47 bottom brackets where the bearings sit “outboard” of 68mm and 73mm wide bottom bracket shells. T47 bottom bracket cups are not compatible with the much smaller BSA threaded BB shells. The “T” stands for “threaded” and the “47” is the approximate outside thread diameter of the cup, in millimeters. T47 is a bottom bracket standard that White Industries helped develop in 2016.