fsa gossamer bb30 crankset installation definition

Cannondale later made BB30 an open standard so that anybody could make use of it. Two circlips are inserted prior, to prevent the bearings going deeper into the shell than they’re supposed to. The wavy washer’s use depends on the crank being used.Īs one of the first major press-fit standards, BB30 makes use of bare cartridge bearings that are directly pressed into the frame – no cups. Bottom bracket shell width: 68 mm (road), 73 mm (MTB)Ĭontents of a typical BB30 kit: (L-R) Two circlips, the bearings themselves, and external dust seals.CATEGORY 3: BOTTOM BRACKETS WITH PRESS-FIT SHELLS, TWO-PIECE CRANKSETS TYPE 3.1: CANNONDALE BB30

I hope this makes this minefield a little easier to navigate. All you need are the correct bottom bracket bearing parts to properly fit the spindle. NB: Any bottom bracket type that will fit a 24 mm Shimano Hollowtech II crank spindle will also fit SRAM GXP (24 mm/22 mm spindle) cranksets. Finally, in deference to the fact that many, many bikes run Shimano parts, I include any notes for using a Shimano Hollowtech II crankset with each press-fit standard. From there, I follow Wheels Manufacturing’s excellent bottom bracket database, which lists the shell width, the shell inside diameter, and the standards’ use or non-use of bearing cups. All press-fit bottom bracket variations are rooted in their almost-universal use of two-piece cranks, which come in different spindle diameters, so I’ll make this the primary consideration. I’ll be approaching this installment a little differently from the first one.

With its outboard bearings, Shimano’s Hollowtech II system brought an effective 86.5 mm bottom bracket shell width for road bikes and 91.5 mm for mountain bikes.From the threaded shell days, bottom bracket width is 68 mm for road bikes and 73 mm for mountain bikes.With two-piece cranksets, spindle diameter is a VERY BIG DEAL, especially how it correlates to the inner diameter of bottom brackets.With three-piece cranksets, spindle diameter generally isn’t a big deal.With threaded shells, things remained pretty straightforward…until Cannondale decided to throw a monkey wrench into proceedings.īut first, a recap of some important details. Previously I covered bottom brackets for frames with threaded shells – right up to where Shimano changed the game with two-piece cranksets.

Fsa gossamer bb30 crankset installation definition