Shell Bb86 vs Shell Osbb: specs compared
Updated 05 September 2026.
4
specs differ
Shell Bb86 and Shell Osbb differ on 4 specs: shell inside diameter, shell width, thread, crank spindles it hosts.
| Spec | Shell Bb86 | Shell Osbb |
|---|---|---|
| Type | press fit | press fit |
| Shell inside diameter | 41 mm smooth press-fit bore | 42 mm bore (alloy, BB30 style) or 46 mm bore (carbon, PF30 style) |
| Shell width | 86.5 mm | 68 mm (road) and 73 mm (MTB) |
| Thread | none, two cartridge bearings in plastic cups press into the 41 mm bore | none on the carbon 46 mm and alloy 42 mm shells; OSBB is a Specialized name, not a separate thread |
| Crank spindles it hosts | 24 mm Shimano Hollowtech II and 24/22 mm SRAM GXP natively; 28.99 mm DUB via a DUB BB86 unit | 30 mm native; 24 mm Shimano and 28.99 mm DUB need a reducer |
Questions and answers
How do Shell Bb86 and Shell Osbb compare?
Shell Bb86 and Shell Osbb differ on 4 specs: shell inside diameter, shell width, thread, crank spindles it hosts.