The bottom bracket listing is named using the format: Frame Shell Standard + "Bottom Bracket" + Crankset Type. For example, BB86 Bottom Bracket for Shimano refers to a BB86 standard frame shell (inner diameter 41 mm, width 86.5 mm) with a compatible bottom bracket for a Shimano-type crankset (24 mm diameter spindle). All bottom brackets come pre-greased and ready to use straight from the box; an additional tube of grease is only needed for future servicing.