BB30 press fit bottom bracket shell (42 mm bore press fit)
What a BB30 press fit shell measures, which crank spindles it hosts, and the bottom bracket to buy.
Published dimensions
| Type | press fit |
|---|---|
| Shell inside diameter | 42 mm smooth press-fit bore |
| Shell width | 68 mm (road) and 73 mm (MTB) |
| Thread | none, two 6806 bearings press directly into the 42 mm bore |
| Crank spindles it hosts | designed around a 30 mm spindle; 24 mm and 28.99 mm cranks need a reducer |
SHELL 68 mm (road) and 73 mm (MTB)
SPINDLE designed around a 30 mm spindle; 24 mm and 28.99 mm cranks need a reducer
SPINDLE designed around a 30 mm spindle; 24 mm and 28.99 mm cranks need a reducer
Used on: road and MTB frames originally from Cannondale, later widely licensed.
BB30 presses bare 6806 bearings straight into a 42 mm bore, so it is the tightest of the 30 mm standards. Because the bore is only 42 mm it cannot take a PF30 pressed cup; do not confuse the two.
Fit a crank to this shell
30 mm spindle (BB30 / PF30 style) in a BB30 press fit shelldrops inShimano Hollowtech II (24 mm) in a BB30 press fit shellneeds a reducerPF30 press fitrelated shell (46 mm bore press fit)BB386EVO press fitrelated shell (46 mm bore, 86.5 mm)BBRight press fitrelated shell (46 mm bore, 79 mm)Specialized OSBBrelated shell (42 or 46 mm bore)
SOURCES: Park Tool, Bottom Bracket Standards and Terminology · Wheels Manufacturing, Three Common Bottom Bracket Misconceptions