Fit a Shimano Hollowtech II (24 mm) crank in a PF30 press fit shell
Whether a Shimano Hollowtech II (24 mm) crank fits a PF30 press fit 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 | PF30 press fit (46 mm smooth press-fit bore, 68 mm (road) and 73 mm (MTB) wide) |
| Verdict | needs a reducer |
| Bottom bracket to buy | PF30 to 24 mm Shimano reducer bottom bracket |
SHELL PF30 press fit (46 mm smooth press-fit bore, 68 mm (road) and 73 mm (MTB) wide)
SPINDLE Shimano Hollowtech II (24 mm) (24 mm constant diameter)
BB PF30 to 24 mm Shimano reducer bottom bracket
SPINDLE Shimano Hollowtech II (24 mm) (24 mm constant diameter)
BB PF30 to 24 mm Shimano reducer bottom bracket
A 24 mm Shimano crank runs in a PF30 46 mm bore using a reducer BB that presses into the 46 mm shell and steps the bearing down to 24 mm. This is a single pressed unit, not a bare bearing.
Use a purpose-made PF30 reducer BB, not a bare 6806 bearing plus spacers. The bare-bearing bodge is the classic source of a creaking PF30.
The bottom bracket to buy
Search Amazon for PF30 to 24 mm Shimano reducer bottom bracketaffiliate searchFind PF30 to 24 mm Shimano reducer bottom bracket on eBayaffiliate
Related fits
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SOURCES: Park Tool, Bottom Bracket Standards and Terminology · Wheels Manufacturing, Crankset Spindle Standards & BB Compatibility · Wheels Manufacturing, Three Common Bottom Bracket Misconceptions