MOUNTAIN BIKE AND MOUNTAIN BIKE-PEDELEC | ORIGINAL OPERATING INSTRUCTIONS 2017ORIGINAL OPERATING INSTRUCTIONS 2017 | MOUNTAIN BIKE AND MOUNTAIN BIKE-PEDELEC
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RIM TRUENESS AND SPOKE TENSION
For the true running of the wheel (e) 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 SCOTT bike may even be impaired before you no-
tice 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
SCOTT dealer to true up the wheel (f).
DANGER!
G
Do not ride with untrue wheels. In the case of extreme side-to-side wob-
bles, 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 bicycle.
CAUTION!
A
Loose spokes must be tightened at once. Otherwise the load on the other
spokes and the rim will increase.
CAUTION!
A
Truing (retruing) wheels is a difficult job which you should definitely leave
to your SCOTT dealer.
VALVES
There are two valve types in general use on SCOTT mountain bikes:
1. Sclaverand or Presta valve(a): This valve is nowadays used on almost all
types of bikes. It is designed to withstand extremely high pressures.
2. Schrader or American valve(b): This is an adapted car tyre 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 de-
press 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 compressed air dispenser. The same applies to 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 (c).
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 (d).
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