Bottom bracket and crankset replacement
The last thing we check for a creak, not the first — and usually not what is wrong.
This is the most over-replaced component on a bicycle, and the reason is acoustic rather than mechanical.
A frame conducts sound extremely well. A dry pedal thread or a seatpost that needs grease produces a noise that seems to come from directly under the rider — which is where the bottom bracket lives. So the bottom bracket gets replaced, the creak comes back, and the rider concludes bicycles are mysterious.
The test that costs nothing
Stand up. If the creak disappears when you lift off the saddle, it is the seatpost or the saddle rails, not the bottom bracket. If it continues, work down the list.
Then pedal backwards. A creak that persists with no load through the drivetrain is unlikely to be drivetrain at all.
We work cheapest to most expensive because that is the order that respects your money, not because the expensive answer is rare.
What the job involves
Ruling out the cheap causes first
- Pedal threadsDry threads are the most common creak we find and take two minutes to fix.
- Seatpost and saddle railsA creak that vanishes when you stand is here, not at the bottom bracket.
- Chainring boltsLoose bolts creak under load and sound exactly like a bearing.
If it really is the bottom bracket
- Cranks removed and shell inspectedFaces checked, threads cleaned, bearings assessed for pitting and play.
- Refitted with the right prepCorrect grease or retaining compound for the standard, torqued to spec.
When this is not the job you need
A repair business that only ever says "book it in" is not worth trusting on anything else. These are the cases where you should not.
- Most creaks are not the bottom bracket. Sound travels through the frame, which is why this part gets replaced unnecessarily so often.
- If the creak stops when you lift off the saddle, it is the seatpost — a far cheaper fix.
- Roughness that appears only after a wash is usually water in the seals, not a failed bearing.
Symptoms that lead here
Common questions
Why does everyone blame the bottom bracket for creaks?
Because the frame conducts sound, so a creak from the seatpost or pedals appears to come from the middle of the bike. It is where riders think they hear it, which is why it gets replaced unnecessarily more than any other component.
How do you actually find a creak?
By elimination, cheapest first — pedals, seatpost, chainring bolts, then the bottom bracket. It is methodical rather than clever, and it is why we charge for the fix and not the diagnosis.
Can this be done at my home?
Inspection, re-greasing and refitting yes. Pressed-in bottom brackets need a bench press, so those go back with us and return — AED 38 for collection and delivery.