Bedienungsanleitung Merida Mountain Bike (Seite 65 von 129) (Englisch)

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Valves

There are two valve types in general use on mountain

and cross bikes:

1. Sclaverand or Presta valve

(d)

: This valve is nowa-

days used on almost all types of bikes. It is designed

to withstand extremely high pressures.

2. Schrader or American valve

(e)

: This is an adapted

car tire valve.

All valve types come with a plastic cap to protect them

from dirt.

The Schrader valve can be inﬂated with a suitable pump

directly after removing the protective cap.

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 valve core is tightened and seated

in its stem, otherwise air may slowly leak out. Do not

forget to tighten by hand the valve nut after inﬂating.

Tires with Schrader valves can conveniently be inﬂated

at car ﬁlling stations with a compressed air dispenser.

The same applies to Presta valves ﬁtted with a special

adapter. A compressed air dispenser must be used very

carefully in short bursts as you may otherwise overin-

ﬂate the tire and make it burst. To let out air, press the

needle in the center of the Schrader valve or the knurled

nut of the Presta valve

(f)

It can be hard to inﬂate tires to the necessary pressure by

using hand pumps. It is much easier with a track pump

equipped with a pressure gauge

(g)

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 un-

balanced and the wheel will no longer run true. The

functioning of your MERIDA 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 brak-

ing 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 millimeter or more, you should ask your

MERIDA dealer to true up the wheel

(h)

Do not ride with untrue wheels. In the case of

extreme side-to-side wobbles, the brake pads

of rim brakes can miss the rim and get caught

in the spokes! This normally instantly jams the wheel

and throws you off your bike.

Loose spokes must be tightened at once. Oth-

erwise the load on the other spokes and the

rim will increase.

Truing (retruing) wheels is a difﬁcult job

which you should deﬁnitely leave to your

MERIDA dealer.

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Merida Mountain Bike Seite 65

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