Shell Osbb vs Shell Bb95: specs compared
Updated 05 September 2026.
4
specs differ
Shell Osbb and Shell Bb95 differ on 4 specs: shell inside diameter, shell width, thread, crank spindles it hosts.
| Spec | Shell Osbb | Shell Bb95 |
|---|---|---|
| Type | press fit | press fit |
| Shell inside diameter | 42 mm bore (alloy, BB30 style) or 46 mm bore (carbon, PF30 style) | 37 mm smooth press-fit bore |
| Shell width | 68 mm (road) and 73 mm (MTB) | 95.5 mm |
| Thread | none on the carbon 46 mm and alloy 42 mm shells; OSBB is a Specialized name, not a separate thread | none, cartridge bearings press straight into moulded carbon seats in the 37 mm bore |
| Crank spindles it hosts | 30 mm native; 24 mm Shimano and 28.99 mm DUB need a reducer | 24 mm Shimano Hollowtech II; the 37 mm bore is too small for a 30 mm spindle |
Questions and answers
How do Shell Osbb and Shell Bb95 compare?
Shell Osbb and Shell Bb95 differ on 4 specs: shell inside diameter, shell width, thread, crank spindles it hosts.