A Trek Boone (T47) frame uses a T47 external (T47-68 / T47-73) bottom bracket shell (M47 x 1.0, 68/73 mm). The dimensions, which cranks fit, and the exact bottom bracket to buy.
Updated 05 September 2026.
What bottom bracket does a Trek Boone (T47) use?
The bottom bracket shell standard on a Trek Boone (T47), and how to pick the right BB.
| Frame | Trek Boone (T47) |
|---|---|
| Shell standard | T47 external (T47-68 / T47-73) (M47 x 1.0, 68/73 mm) |
| Shell inside diameter | about 46 mm bore, cut with an M47 x 1.0 thread |
| Shell width | 68 mm and 73 mm |
SPINDLE see table
The Trek Boone (T47) uses a T47 external (T47-68 / T47-73) bottom bracket shell (M47 x 1.0, 68/73 mm), a about 46 mm bore, cut with an M47 x 1.0 thread, 68 mm and 73 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: Velo, Trek confirms use of T47 threaded bottom brackets · White Industries, External T47 Bottom Bracket · Escape Collective, Threaded #12: the woes of T47 bottom brackets
Questions and answers
What bottom bracket does a Trek Boone (T47) use?
A Trek Boone (T47) frame uses a T47 external (T47-68 / T47-73) bottom bracket shell (M47 x 1.0, 68/73 mm).