Headset service: kill the knock, steer smooth again
Kill the knock. Steer smooth again.
The bearings your fork steers on. Play at the front end (a knock under braking) or gritty steering both point at a headset service: strip, clean, regrease, and set the preload correctly.
Chris King
NoThreadset / InSet — rebuildable, sealed, decades of service life.
Torque specs
| Stem clamp bolts | 5–6 N·m |
|---|---|
| Preload (top cap) | snug to zero play |
Manufacturer-claimed — always confirm against your model manual.
Video walk-throughs
Opens a YouTube search — we link out rather than embed unverified videos.
Manuals & documents
Further reading
Mechanic's tips
- King bearings are serviceable — a light regrease beats replacement.
Tools you'll need
4 / 5 mm hex keys
Stem + top cap
Quality grease
Bearings + races
Torque wrench
Stem clamp bolts
Headset press
Only for pressed cups
Star-nut setter
Threadless alloy steerers
Step by step
- 1
Loosen the stem
Undo the stem clamp bolts and the top-cap bolt.
- 2
Drop the fork
Slide the stem + spacers up and lower the fork out of the head tube.
- 3
Clean & inspect
Wipe races and bearings; look for pitting, rust, or brinelling.
- 4
Regrease
Fresh grease on both bearings and the crown race.
- 5
Reassemble
Fork up, bearings + spacers + stem back on.
- 6
Set preload
Top-cap bolt to remove play — snug, not tight.
- 7
Align & torque
Square the stem to the wheel and torque the clamp bolts.
Frequently asked
How do I know if my headset needs a service, not a replacement? +
A light knock under braking that goes away once you tighten the top-cap preload is usually just play, not damage — strip, clean and regrease. If you feel notchiness or grinding as you turn the bars slowly with the front brake held, the bearings themselves are pitted and need replacing rather than just a regrease.
What grease should I use on headset bearings? +
Any quality waterproof bearing grease (marine or bicycle-specific) works on standard sealed cartridge bearings. Avoid thin lube-style products — they wash out fast, especially through a wet SA winter, and you will be back in the headset within a few thousand km.
Do I need a headset press to service my headset at home? +
No — a press is only needed if you are fitting new cups into the frame. A routine strip-clean-regrease-preload service uses hex keys and grease only. You only reach for a press (or a shop) if the cups themselves are being replaced.
How tight should the top-cap preload bolt be? +
Snug, not tight. The top cap only needs to remove play in the headset — it is not a structural fastener and over-tightening it can bind the bearings or crush the compression system. Set preload first with the stem loose, then torque the stem clamp bolts to spec once the fork is knock-free.
How we source this
- Torque figures are manufacturer-claimed — always confirm against your model's manual before you put a wrench on it, especially on carbon steerers and stems.
- Standards, tools and steps reflect common current fitments (IS/ZS/EC/tapered) rather than every historical headset ever made — check your frame/fork if you run an older or unusual size.
- Manuals link to each brand's own official service hub; video links go to a YouTube search for that title + channel rather than an embedded/fabricated video ID, so you always land on real, current content.
- We do not sell or rate headsets on this page and carry no aggregate customer rating here — this is independent how-to content, not a product listing.