Page 88 - Urban Jungle mode d'emploi_EN_HD

With Presta valves you first have to undo the small knurled nut a little and depress it carefully until air starts to escape. Check the nut is tightened and seated in its stem, otherwise air may slowly leak out. Do not forget to tighten the valve by hand nut after inflating.
Tyres with Schrader valves can conveniently be inflated at car filling stations with a com- pressed air dispenser. The same applies to Dunlop and Presta valves fitted with a special adapter. A compressed air dispenser must be used very carefully as you may otherwise overinflate the tyre and make it burst.
To let out air, press the needle in the centre of the Schrader valve or the knurled nut of the Presta valve (e).
In the case of the Dunlop valve unscrew the knurled nut until air comes out of the valve. Retighten the knurled nut subsequently. Normally, you have to inflate the tyre completely.
It can be hard to inflate tyres to the necessary pressure by using hand pumps. It is much easier with a track pump equipped with a pressure gauge.
RIM TRUENESS AND SPOKE TENSION
For the true running of the wheel it is imperative that the tension exerted by the spokes is distributed evenly around the rim. If the tension of a single spoke changes, e.g. as a result of riding fast over a kerb or of a loose nipple, the tensile forces acting on the rim become unbalanced and the wheel will no longer run true. The functioning of the URBAN JUNGLE bike may even be impaired before you notice the wobbling appearance of a wheel that has gone out of true.
With rim brakes the sides of the rims also serve as braking surfaces. An untrue wheel can impair your braking effect. It is therefore advisable to check the wheels for trueness from time to time. For this purpose lift the wheel off the ground and spin it with your hand. Watch the gap between the rim and the brake pads. If the gap varies by one millimetre or more, you should ask your URBAN JUNGLE dealer to true up the wheel (f).
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