Merida Bike Manuel d'utilisateur télécharger pdf (Page 71)

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12. The headset

Headset

The headset connects the fork, stem, handle-

bars and front wheel to the frame but allows

them to turn freely as a unit. It must afford

virtually no resistance to turning if the bike

is to go straight, stabilizing itself as it runs.

Shocks caused by uneven road surfaces sub-

ject the headset to considerable stress. In this

way it can become loose and maladjusted.

The adjustment of the headset is a job best

left to your MERIDA dealer.

12.1 Checking the bearing play of

the headset

Check the headset for play by placing your

fingers around the upper head cup.

Actuate the front brakes with your other hand

and push the bike vigorously back and forth

on the ground.

If the bearing has play, you will feel the upper

head cup moving against the lower cup.

Another way to check the headset is to lift the

front wheel off the ground a little and then

let it drop. A rattling noise tells you that the

bearing has play.

To check the bearing for ease of running,

lift the frame until the front wheel no longer

touches the ground. Move the handlebars left

and right. The front wheel should turn very

easily left and right through its full range

without catching anywhere. A light tap on

the handlebars should be enough to turn the

wheel to the side.

12.2 Adjusting the conventional

headset

For adjusting a headset of the classical type

you need two flat fork spanners. The span-

ners must have an opening of at least 32

millimetres depending on the diameter of the

bearing.

Keeping the front wheel fixed between your

legs apply both spanners and release the top

locknut.

Screw the upper head cup downward a little.

Be sure not to screw the head cup complete-

ly tight, as you may otherwise immediately

damage the bearing.

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