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Parts ranked by shell inside diameter

about 46 mm bore, cut with an M47 x 1.0 thread

T47 external (T47-68 / T47-73) bottom bracket has the highest shell inside diameter in the dataset, at about 46 mm bore, cut with an M47 x 1.0 thread.

Which part has the highest shell inside diameter?

T47 external (T47-68 / T47-73) bottom bracket, at about 46 mm bore, cut with an M47 x 1.0 thread, tops the 16 parts we hold a published shell inside diameter for. The full ranking is below.

#	Parts	Shell inside diameter
1	T47 external (T47-68 / T47-73) bottom bracket	about 46 mm bore, cut with an M47 x 1.0 thread
2	T47 internal (T47-85.5 / T47-86 / T47-92) bottom bracket	about 46 mm bore, cut with an M47 x 1.0 thread
3	PF30 press fit bottom bracket	46 mm smooth press-fit bore
4	BB386EVO press fit bottom bracket	46 mm smooth press-fit bore
5	BBRight press fit bottom bracket	46 mm smooth press-fit bore
6	BB392EVO press fit (MTB) bottom bracket	46 mm smooth press-fit bore
7	PF30A press fit (Cannondale Ai) bottom bracket	46 mm smooth press-fit bore
8	BB30 press fit bottom bracket	42 mm smooth press-fit bore
9	Specialized OSBB bottom bracket	42 mm bore (alloy, BB30 style) or 46 mm bore (carbon, PF30 style)
10	BB30A press fit (Cannondale) bottom bracket	42 mm smooth press-fit bore
11	BB86 press fit (road) bottom bracket	41 mm smooth press-fit bore
12	BB92 press fit (MTB) bottom bracket	41 mm smooth press-fit bore
13	Trek BB90 press fit (road) bottom bracket	37 mm smooth press-fit bore
14	Trek BB95 press fit (MTB) bottom bracket	37 mm smooth press-fit bore
15	Italian threaded bottom bracket	35 mm threaded bore
16	BSA / English threaded bottom bracket	1.37 in (about 34.8 mm) threaded bore

Data as of 2026-09-06.

Parts ranked by shell inside diameter

Which part has the highest shell inside diameter?

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