Fit a Shimano Hollowtech II (24 mm) crank in a T47 external (T47-68 / T47-73) shell
Whether a Shimano Hollowtech II (24 mm) crank fits a T47 external (T47-68 / T47-73) shell, and the bottom bracket that makes it work.
The crank and the shell
| Crank spindle | Shimano Hollowtech II (24 mm) (24 mm constant diameter) |
|---|---|
| Frame shell | T47 external (T47-68 / T47-73) (about 46 mm bore, cut with an M47 x 1.0 thread, 68 mm and 73 mm wide) |
| Verdict | drops in |
| Bottom bracket to buy | 24 mm Shimano-compatible T47 external bottom bracket |
SHELL T47 external (T47-68 / T47-73) (about 46 mm bore, cut with an M47 x 1.0 thread, 68 mm and 73 mm wide)
SPINDLE Shimano Hollowtech II (24 mm) (24 mm constant diameter)
BB 24 mm Shimano-compatible T47 external bottom bracket
SPINDLE Shimano Hollowtech II (24 mm) (24 mm constant diameter)
BB 24 mm Shimano-compatible T47 external bottom bracket
A 24 mm Shimano crank fits a 68 or 73 mm T47 shell using an external T47 BB threaded into the M47 x 1.0 shell. The bearings sit outboard like an English BB.
Confirm your T47 shell is the narrow 68/73 mm external type, not a wide internal shell. The two use different length BBs and are not interchangeable.
The bottom bracket to buy
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Related fits
Shimano Hollowtech II (24 mm)24 mm spindleT47 external (T47-68 / T47-73)M47 x 1.0, 68/73 mmShimano Hollowtech II (24 mm) in a BSA / English threaded shelldrops inShimano Hollowtech II (24 mm) in a Italian threaded shelldrops inShimano Hollowtech II (24 mm) in a PF30 press fit shellneeds a reducerShimano Hollowtech II (24 mm) in a BB30 press fit shellneeds a reducer
SOURCES: Park Tool, Bottom Bracket Standards and Terminology · Wheels Manufacturing, Crankset Spindle Standards & BB Compatibility · White Industries, External T47 Bottom Bracket · Escape Collective, Threaded #12: the woes of T47 bottom brackets