Drivetrain · Intermediate · ~15 min read
Drivetrain
Fixing a Creaking Bike
A mystery creak is one of the most maddening problems in cycling. It sounds like it's coming from the bottom bracket, but it might be your saddle rails, headset, or even a water bottle cage bolt. The key is a systematic elimination approach — start at the most likely cause and rule things out one at a time.

Diagnosing the Source

Creaks are deceptive. Sound travels through a frame and can appear to come from a completely different location than the actual source. Before opening anything up, gather information:

Before dismantling anything, tighten every bolt you can reach — pedals, crank bolts, chainring bolts, bottle cage bolts, saddle rails, seatpost collar. A loose bottle cage bolt causes a creak that sounds exactly like a failing bottom bracket. Fix the easy things first.

Check the Pedals First

Pedals are the most commonly overlooked creak source and the easiest to check. They work loose over time (left pedal has reverse thread — counter-clockwise to tighten when facing the thread end), and the internal bearings can wear or contaminate.

1
Re-grease and torque the pedal threads

Remove both pedals (remember: left pedal is reverse threaded — turn clockwise to remove, counter-clockwise to tighten). Clean the threads on both pedal axles and the crank arm threads. Apply a generous amount of anti-seize grease or copper grease to the pedal threads — this prevents galling and makes future removal possible. Torque to 35 Nm. A squeaking or clicking noise from a pedal that stops when you stand still strongly suggests the pedal threads.

2
Check clipless cleat tension

If you ride clipless pedals, worn or mis-adjusted cleats creak on every pedal stroke. The metal-on-metal interface between cleat and pedal body wears and develops play. Apply a small amount of dry lube to the cleat engagement surfaces. If the creak persists, replace the cleats — they're cheap and wear out every 6–12 months of regular use.

Saddle, Seatpost, and Handlebar

3
Grease the seatpost and saddle rails

Remove the seatpost, clean it thoroughly, and apply fresh grease to the seatpost tube and collar area before reinserting (carbon posts and frames: use carbon assembly paste, not grease — it provides friction without the clamping force needed for grease). Saddle rail clamps should be torqued correctly (5–8 Nm typically) — under-torqued rails flex and creak. Apply a drop of grease to the points where the rails contact the saddle clamp jaws.

4
Check the headset and stem

Creaks from the front of the bike during out-of-saddle efforts can be the headset or stem. Check headset preload — hold the front brake and rock the bike forward: any clunking indicates insufficient preload. Tighten the stem cap bolt (usually 4–5 Nm) to add preload, then re-tighten stem clamp bolts. Grease the stem steerer interface and stem faceplate bolt threads.

Bottom Bracket Types

The bottom bracket standard on your bike determines how it's serviced. Getting this wrong means buying the wrong tools or — worse — damaging an expensive frame.

Check your frame's BB standard before ordering any parts or tools. It's usually listed in the frame manual or on the manufacturer's website by frame model and year. Installing the wrong standard damages the frame.

Servicing a Threaded Bottom Bracket

5
Remove the cranks

Remove the crank bolt using an 8mm Allen key (Shimano Hollowtech II) or the appropriate tool for your system. Shimano cranks then pull off by hand — there's a plastic cap that screws off (counter-clockwise), exposing the pinch bolts, which you loosen with a 5mm Allen key before pulling the non-drive crank arm off and sliding the spindle through. GXP cranks use a different extraction method — consult the specific manual for SRAM GXP cranksets.

6
Remove the BB cups and inspect

Use the correct BB cup tool for your standard. Threads of a BSA BB: drive side (right) is reverse-threaded — turn clockwise to loosen. Non-drive side (left) is normal — turn counter-clockwise to loosen. If the cups feel rough or notchy when you spin them, the bearings are worn or contaminated. Spin each cup by hand — smooth sealed bearings should spin freely with minimal resistance.

7
Chase the threads and reinstall

Clean the BB shell thoroughly. If you have a BB thread tap, run it through both sides — this removes corrosion and burrs that cause creaking. Apply fresh grease liberally to the cup threads and the face of the shell (the flat surface where the cup seats against the frame). Torque the cups firmly — most threaded BBs spec 35–50 Nm. Under-torqued cups work loose and creak.

Press-Fit Bottom Brackets

Press-fit BBs are notorious for creaking, particularly on carbon frames. The fundamental issue is that pressed bearings can work loose in the shell, creating microscopic movement that produces a loud, rhythmic creak.

8
Remove press-fit cups properly

A proper press-fit removal tool is essential — improvised methods (hammers, drifts) damage the shell. After removal, inspect the shell interior for fretting (circular wear marks). Minor fretting can be filled with retaining compound (Loctite 603 or equivalent) during reinstallation. Severe fretting requires a specialist to fit threaded inserts.

9
Consider converting to threaded

If your press-fit BB creaks repeatedly, the most permanent fix is a threaded bottom bracket insert — a machined aluminium sleeve that is bonded into the press-fit shell and provides threaded cups. Wheels Manufacturing and Enduro make reliable conversion kits. This is a permanent modification but eliminates press-fit creaking entirely. It requires a press tool and ideally a professional installation the first time.

Full Creak Checklist

Work through this in order before reaching for the BB tools. Most creaks are solved within the first four items:

If you've gone through the entire checklist and the creak persists, describe it to a bike mechanic with as much detail as possible — when it occurs, what frequency, whether it's changed over time. A good mechanic can often narrow it to two or three suspects from description alone before they even touch the bike.