A Colnago G4-X gravel frame uses a T47 internal (T47-85.5 / T47-86 / T47-92) bottom bracket shell (M47 x 1.0, 85.5-92 mm). The dimensions, which cranks fit, and the exact bottom bracket to buy.
Updated 05 September 2026.
What bottom bracket does a Colnago G4-X gravel use?
The bottom bracket shell standard on a Colnago G4-X gravel, and how to pick the right BB.
| Frame | Colnago G4-X gravel |
|---|---|
| Shell standard | T47 internal (T47-85.5 / T47-86 / T47-92) (M47 x 1.0, 85.5-92 mm) |
| Shell inside diameter | about 46 mm bore, cut with an M47 x 1.0 thread |
| Shell width | 85.5 mm, 86 mm and 92 mm |
SPINDLE see table
The Colnago G4-X gravel uses a T47 internal (T47-85.5 / T47-86 / T47-92) bottom bracket shell (M47 x 1.0, 85.5-92 mm), a about 46 mm bore, cut with an M47 x 1.0 thread, 85.5 mm, 86 mm and 92 mm wide.
It is a threaded shell (M47 x 1.0 (47 mm outside thread diameter, 1.0 mm pitch), drive-side left-hand), so the bottom bracket screws in rather than presses. Confirm the shell width before buying, because the same thread is cut in more than one width.
SOURCES: Escape Collective, Threaded #12: the woes of T47 bottom brackets · White Industries, Internal T47 Bottom Bracket
Questions and answers
What bottom bracket does a Colnago G4-X gravel use?
A Colnago G4-X gravel frame uses a T47 internal (T47-85.5 / T47-86 / T47-92) bottom bracket shell (M47 x 1.0, 85.5-92 mm).