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How to fix BB30 and press-fit bottom bracket creak without replacing bearings

By Crankworthy · Published · Updated

Bottom bracket creaking in BB30 and press-fit systems is caused by microscopic movement and bearing migration within the frame shell rather than worn-out bearings 12. To silence the creak, remove and thoroughly degrease the bearings and frame bore, then press the bearings back in using a medium-strength retaining compound like Loctite 641 or 609 on the outer race 14. Reassembling the crank spindle with a fresh layer of grease and torquing all hardware to specification will prevent lateral play and maintain long-term silence 24.

Why press-fit bottom brackets creak

Press-fit (PF30, BB86, BB92) and BB30 bottom brackets are widely known for developing rhythmic creaks under heavy pedalling load 12. If your bearings spin smoothly and feel free of grit when turned by hand, there is no need to buy new bearings 1.

The noise comes from micro-movement — tiny shifts between the bearing outer race (or plastic cup) and the frame shell bore — or from fretting corrosion along the crank spindle 1.

When you stand on the pedals or climb a steep rise, immense torsional forces flex the frame 2. Because carbon and alloy bottom bracket shell tolerances can vary by fractions of a millimetre, standard grease applied to the shell can allow the bearing to migrate or shift under load 12. That minute sliding motion is the high-pitched "eek-eek" or clicking sound riders describe 1.

Step 1 — Disassembly and inspection

  1. 1

    Remove the crankset

    Remove the crank arms with the hex key your crank takes — 10 mm on many BB30 cranks — or a crank extractor, then pull the spindle out of the frame 4.

  2. 2

    Remove the bearings or cups

    Use a dedicated BB30 / press-fit removal tool or a bearing drift to carefully tap or press out the bearings or plastic cups 4.

  3. 3

    Inspect

    Spin each bearing on your finger. If it rotates smoothly without grinding, it is sound and ready to be re-installed 1.

Step 2 — Deep cleaning and degreasing

Retaining compound only works on a clean, dry surface. This step is the one most often skipped, and it is the one that decides whether the repair lasts.

  1. 1

    Degrease the contact surfaces

    Meticulously clean all oil, dirt and old lubricant from the frame's bottom bracket shell bore, the outer races of the bearings, and the crank spindle 12.

  2. 2

    Choose the right solvent

    Use isopropyl alcohol, acetone, or a dedicated electronic or chain degreaser with a clean microfibre rag 12. Avoid heavy automotive brake cleaners and carburettor cleaners, which can damage carbon finishes and paint 1.

Step 3 — Applying retaining compound

A medium-strength retaining compound fills the tolerance gaps and locks the bearing in place, which is exactly what grease cannot do.

Use a medium-strength anaerobic retaining compound engineered for smooth bearing fits, such as Loctite 641, Loctite 609 or VibraTite 530 — Loctite lists retaining bearings in housings as a typical application for exactly this product 15. Do not reach for a permanent high-strength threadlocker such as Loctite 271: releasing it later needs heat, which is the last thing you want to apply to a frame.

Apply a thin, light bead around the flat outer surface of the bearing race 1. Applying it to the bearing race rather than inside the frame shell keeps excess fluid from being pushed into the interior of the frame 1.

frame shell borebearing outer raceballsinner racespindlecentrelinethin bead, hereon the outer racenot inside the shell — it getspushed into the frame
The bead goes on the flat outer race of the bearing, not inside the frame shell — excess applied to the shell is pushed into the frame when the bearing seats [1]. Shown as a half-section: shell bore above, bearing below, the interface between them is the joint you are bonding.

Step 4 — Pressing and curing

  1. 1

    Align squarely

    Set the bearings into the frame bore by hand, making sure they start completely level and square 4.

  2. 2

    Use the proper tool

    Press the bearings in with a tool that bears on the ring being fitted — the outer race, or both races at once. Never press solely on the inner race: the load then travels through the balls and brinells the raceways 6.

  3. 3

    Allow the full cure

    Wipe away excess fluid with isopropyl alcohol and leave it undisturbed. Loctite quotes its cured strength figures after 24 hours at 22 °C, so give it a day before riding 5 — an anaerobic compound reaches handling strength long before full strength, which is what makes it tempting to ride too early.

Step 5 — Spindle prep and reassembly

  1. 1

    The freezer trick

    Put the aluminium crank spindle in the freezer for 15–20 minutes before installation 1. Cold contraction shrinks the spindle slightly, so it slides through the bearing inner races without disturbing the newly bonded bearings 1.

  2. 2

    Grease the spindle interfaces

    Apply a thin layer of waterproof grease or poly-lube to the crank spindle journals, wave washers and dust caps, to prevent metal-on-metal fretting corrosion 2.

  3. 3

    Preload, then torque

    Reinstall the crankset and set the preload as your crank manufacturer specifies — enough to remove lateral play without binding. Then torque the crank bolt to the manufacturer’s figure for your system, using a torque wrench. The figures differ by system; the table below carries the ones we could source.

Crank bolt torque, by system

Every figure here is the manufacturer’s own, with the document it came from. Where we could not source a manufacturer figure, none is printed — the number circulating for Race Face Cinch comes from a magazine guide rather than Race Face, so it is not repeated here. Confirm any figure against the manual for your exact model; many cranks also carry it printed on the arm.

SystemTorqueToolSource
SRAM DUB (crank arm bolt)54 N·m (478 in-lb)read in the manual8 mm hex bit socketSRAM MTB Cranksets and Bottom Brackets user manual, p.8
Shimano Hollowtech II (left arm pinch bolts)12–14 N·mconfirm in your model’s manual5 mm hex, tightened alternately in stagesShimano Dealer’s Manual DM-MBFC001
Race Face Cinchsee your manual8 mm hexRace Face Cinch crank installation (30 mm spindle)

If the frame shell is worn

Where a shell has become oversized after years of loose bearings, retaining compound alone may not hold long term 2. Two mechanical fixes remove the reliance on the shell instead of working around it.

Thread-together press-fit bottom brackets use drive-side and non-drive-side aluminium cups that thread into each other inside the shell 2. That locks both sides rigidly together and keeps the bearings parallel, so frame shell tolerance stops being the thing holding your bottom bracket in place 2.

frame shell — no threadsleft cupright cupthreads meet herecups clamp against each otherbearingbearingcentreline
A thread-together unit clamps itself: the two cups tighten against each other inside the shell, so the frame’s bore tolerance no longer has to hold the bearings still [2]. The frame carries the unit; it no longer has to grip each bearing.

The standards this applies to

All of these are press-fit shells — no threads in the frame for the bottom bracket to screw into. Shell bores and widths as Park Tool defines the standards [3].

BB30
42 mm shell bore, 68 mm wide (road) or 73 mm (MTB), 30 mm spindle. Bearings press directly into the frame.
PF30
46 mm shell bore with plastic cups carrying the bearings; 30 mm spindle.
BB86 / BB92
41 mm shell bore, 86.5 mm (road) or 91.5 mm (MTB) wide, for a 24 mm Shimano spindle.
Threaded BSA
Not affected by this procedure — the cups screw into the frame, so there is no press fit to migrate. 68 or 73 mm wide.

Tools from our catalog for the crank removal

These cover getting the crank off and the spindle greased. The press-fit specific tools are not in our catalog yet — see below.

What this job needs that we don’t stock

Named so you can source them elsewhere — we would rather say this than point you at a product that is not the right one for the job.

  • A bearing retaining compound (Loctite 641 / 609 or VibraTite 530). Our catalog carries Loctite 243, which is a threadlocker — the wrong product for bonding a bearing race.
  • A BB30 / press-fit bearing removal tool and a bearing press that loads the outer race.
  • Thread-together press-fit bottom brackets. Every bottom bracket in our catalog is threaded BSA.

References

  1. 1.How to Fix a Creaking BB30 Bottom Bracket — BBInfinite (bearing migration, solvent choice, retaining compound on the outer race, chilling the spindle)
  2. 2.Masterclass: Solving the Creaking Bottom Bracket Issue — Dr Michael Hanslip, Bicycling Australia (press-fit standards, cleaning, grease, thread-together units)
  3. 3.Bottom Bracket Standards and Terminology — Park Tool
  4. 4.Bottom Bracket Removal & Installation: Press Fit — Park Tool
  5. 5.LOCTITE 641 retaining compound, technical data sheet — Henkel
  6. 6.Mounting bearings with a cylindrical bore — SKF (mounting force must act on the ring being fitted)

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