Headset and bearing service
Notchy steering and knocking under braking — usually contamination, not failure.
The headset is the bearing you never think about until the steering starts feeling wrong, and by then it is often past a simple service.
Two symptoms matter. A knock through the bars under braking is play — the assembly has loosened and is moving. A notch as the bars pass centre is pitting, where the bearings have worn dents into the races from being ridden loose or dry.
The first is an adjustment. The second is a replacement. Which is why catching the first one early is worth doing.
Why standing still is bad for it
Grease has a working temperature range. Sustained heat thins it, and thinned grease migrates away from the bearing under gravity. A headset that felt fine in April can be dry by October without a single kilometre ridden — one of several reasons a bicycle in this city degrades faster parked than ridden.
What the job involves
What we check
- Play under brakingFront brake on, rock the bike: a knock through the bars is headset play.
- Notchiness through the rangeBars turned slowly lock to lock, feeling for indexing in the bearing race.
- Water and sand ingressThe usual cause here. Seals checked and races inspected for pitting.
The service
- Stripped, cleaned and re-greasedBearings out, races cleaned, fresh grease suited to sustained heat.
- Preload set correctlyTight enough to remove play, loose enough that steering stays free.
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.
- Caught early this is a clean and re-grease, not a replacement. Left to run with play, the races pit and it becomes one.
- A knock under braking can also be a loose hub or a cracked fork crown — worth ruling those out.
Symptoms that lead here
Common questions
What does a worn headset feel like?
Two signs: a knock through the bars when you brake hard, and a slight notch or catch as the bars pass straight ahead. The second means the bearing races have started to pit, which is the point where a service becomes a replacement.
Why do headsets fail faster in Dubai?
Fine sand gets past the seals and acts as a grinding paste, and sustained heat thins the grease so it migrates away from where it is needed. Bikes stored on balconies through a summer are the worst affected.