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Data studies from 1,281 computed fitments
Original rankings computed from our own compatibility and specification dataset, covering 44 parts and 1,281 checked combinations. Every figure is a real count from that data, with the sample size shown and the method stated. The tables are free to cite and republish with a link.
Data as of 2026-09-06.
The most broadly compatible parts238 · Braze-on (direct-mount) front derailleur fits 238 of the combinations we checked directly, more than any other of the 29 parts in the dataset.The parts most likely to need an adapter53% · Shimano Hollowtech II (24 mm) crank spindle needs an adapter or does not fit in 53% of the combinations we checked, the highest share in the dataset.Parts ranked by shell inside diameterabout 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.Parts ranked by shell width95.5 mm · Trek BB95 press fit (MTB) bottom bracket has the highest shell width in the dataset, at 95.5 mm.Parts ranked by threadnone, two 6806 bearings press directly into the 42 mm bore · BB30 press fit bottom bracket has the highest thread in the dataset, at none, two 6806 bearings press directly into the 42 mm bore.Parts ranked by cup / bearing outside diameter55.0 mm cup outside diameter, 54.9 to 54.95 mm head-tube bore · ZS55 headset standard has the highest cup / bearing outside diameter in the dataset, at 55.0 mm cup outside diameter, 54.9 to 54.95 mm head-tube bore.Parts ranked by steerer diameter38.1 mm (1 1/2 in) · EC49 headset standard has the highest steerer diameter in the dataset, at 38.1 mm (1 1/2 in).Parts ranked by crown race40.0 mm crown race seat · EC49 headset standard has the highest crown race in the dataset, at 40.0 mm crown race seat.Parts ranked by axle diameter15 mm axle · 15x100 mm front thru-axle has the highest axle diameter in the dataset, at 15 mm axle.Parts ranked by diameter34.9 mm · 34.9 mm seatpost has the highest diameter in the dataset, at 34.9 mm.Parts ranked by hub width157 mm hub width (Super Boost Plus) · 12x157 mm Super Boost rear thru-axle has the highest hub width in the dataset, at 157 mm hub width (Super Boost Plus).Parts ranked by thread pitchcommonly M15 x 1.5 · 15x100 mm front thru-axle has the highest thread pitch in the dataset, at commonly M15 x 1.5.