Shell Bbright vs Shell Bb90: specs compared
Updated 05 September 2026.
4
specs differ
Shell Bbright and Shell Bb90 differ on 4 specs: shell inside diameter, shell width, thread, crank spindles it hosts.
| Spec | Shell Bbright | Shell Bb90 |
|---|---|---|
| Type | press fit | press fit |
| Shell inside diameter | 46 mm smooth press-fit bore | 37 mm smooth press-fit bore |
| Shell width | 79 mm (asymmetric, offset 11 mm to the non-drive side) | 90.5 mm |
| Thread | none, cups press into the 46 mm bore | none, cartridge bearings press straight into moulded carbon seats in the 37 mm bore |
| Crank spindles it hosts | designed around a 30 mm spindle; 24 mm and 28.99 mm cranks need a reducer BB | 24 mm Shimano Hollowtech II; the 37 mm bore is too small for a 30 mm spindle |
Questions and answers
How do Shell Bbright and Shell Bb90 compare?
Shell Bbright and Shell Bb90 differ on 4 specs: shell inside diameter, shell width, thread, crank spindles it hosts.