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Scott Trekking - 2017 Manual

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ENGLISHENGLISH
85 |
TREKKING AND TREKKING-PEDELEC | ORIGINAL OPERATING INSTRUCTIONS 2017ORIGINAL OPERATING INSTRUCTIONS 2017 | TREKKING AND TREKKING-PEDELEC
| 84
If you want to mount a new tyre, you need to observe the sizing system and the
actual size of the old tyre. The latter is specified in two different units on the side
of the tyre. One of the sizes is the standardized size in millimetres which is more
precise, e.g. the number sequence 40-622 (d) means that the tyre is 40 mm in
width when fully inflated and has an inner tyre diameter of 622 millimetres. The
other size is indicated in inches (e.g. 28x1.5”).
Tyres must be inflated to the proper inflation pressure to provide an optimal
compromise between smooth running and riding comfort. Properly inflated
tyres are also more resistant to punctures. An insufficiently inflated tyre can
easily get pinched (“snakebite”) when it goes over a sharp kerb.
The air pressure recommended by the manufacturer is given on the side of the
tyre or on the type label (e). The lower of the two pressure specifications makes
for better cushioning for lightweight riders and is therefore best for cycling on
a rough surface. Rolling resistance on level ground decreases with growing
pressure, but so does comfort. Highly inflated tyres are therefore most suitable
for heavy riders and for riding on tarred roads. Therefore, adjust the pressure to
your weight and your riding habits.
Inflation pressure is often given in the old system of units, i.e. in psi (pounds per
square inch). The table (f) gives the most common pressure values in terms of
both systems.
Clincher and folding tyres and rim alone are not able to hold the air. Therefore,
an inner tube has to be placed inside the tyre to retain the air pressure.
Rims of clincher and folding tyres require in general a high-value rim tape over
the complete width of the rim base. This rim tape protects the inner tube from
the braking heat which could make the tyre burst.
DANGER!
G
Replace tyres with a worn tread or with brittle or frayed sides. Dampness
and dirt penetrating the tyre can cause damage to its inner structure. The
tube might burst. Risk of falling!
WHEELS AND TYRES
The wheel consists of the hub, the spokes and the rim. The tyre is mounted onto
the rim so that it encases the tube in the case of the most common system, i.e.
the clincher or folding tyres. There is a rim tape running around the rim well
(a) to protect the sensitive tube against the edges of the rim trough, which are
often sharp.
Another common system comprises tubeless tyres which require specific rims
without boreholes and firmly screwed valves.
The wheels are subjected to considerable stress through the weight of the rider
and any carried luggage as well as through bumpy road surfaces and terrain.
Although wheels are manufactured with great care and delivered accurately
trued, spokes and nipples can lose a little tension on the first kilometres. Ask
your SCOTT dealer to check and true up the wheels after you have bedded
them in over about 100 to 300 kilometres or 5 to 15 hours of use.
After the bedding-in period, check the wheels regularly. It will, however, rarely
be necessary to retighten the spokes (b).
CAUTION!
A
Truing (retruing) wheels is a difficult job which you should definitely leave
to your SCOTT dealer.
NOTE!
I
Tubeless tyres will not be considered any further in the following. Read the
manuals of the rim manufacturer, the tyre producer on this SCOTT info CD
and ask your SCOTT dealer for advice.
NOTES ON TYRES, INNER TUBES, RIM TAPE, INFLATION PRESSURE
The tyres should provide grip and traction. At the same time they should run
smooth and enhance the rider’s comfort by absorbing small shocks. Both the
rolling friction and the grip depend on the nature of the tyre carcass, the rubber
compound and the tyre tread. Your SCOTT dealer will be pleased to help you
choose from the numerous types of tyres (c).
psi bar psi bar
45 3.1 75 5.2
50 3.4 80 5.5
55 3.8 85 5.9
60 4.1 90 6.2
65 4.5 95 6.6
70 4.8 100 6.9
b ca e fd
… 43 …


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