Lapierre Sitandgo, Owner'S Manual

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4
Headset
The headset is composed of two bearings and races placed
at each end of the head tube. Lapierre
™
bikes use one of two
types of headsets: classic (when the front fork, which has screw
threads, is secured by a locknut).
During intense rides, the headset is put under a large amount of
pressure, and afterwards you may notice some play, which could
make it difficult to steer. Riding with the headset not properly
adjusted could cause damage to your bike.
Here are two simple tests to perform before each ride :
Test 1 — While applying the front brake, try to move the bike
forwards and backwards. You will notice right away if there is
movement of the steer tube in the headset.
Test 2 — You can also hold the handlebars and top tube loosely
and gently bounce the front wheel on a concrete surface (the tire
must be inflated). You will hear a hollow vibration if there is any
play (ignore the sounds of vibrating cables, etc.).
You can also discover play by slightly lifting the front wheel off
the ground and turning the handlebars from left to right. If there
is play, you will notice that it doesn’t turn smoothly.
If you do notice that there is play :
A — For a classic headset:
1 Loosen the locknut.
2 Tighten the top race while tightly holding the fork so it does not turn.
3 Tighten until the play has disappeared.
4 Check to see if the headset turns correctly now.
5 While holding the top race in place, tighten the locknut.
6 Check again that the headset can turn smoothly.
Warning ! When adjusting your headset, you must use headset
wrenches. Do not use ordinary open-ended wrenches as this may
result in damage to the locknut and top race.
II— Settings