Notes On Tyres, Inner Tubes, Rim Tape, Inflation Pressure - Scott TIME TRIAL MACHINE Owner's Manual

NOTICE
Truing (retruing) wheels is a difficult job which you should definitely leave to
your SCOTT dealer.

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.
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 standardised size in millimetres which is more
precise, e.g. the number sequence 25-622 means that the tyre is 25 - 28 mm
wide when fully inflated and has an inner tyre diameter of 622 millimetres. The
other size is indicated in inches (e.g. 28x1.35 or 700x35C) (a).
Tyres must be inflated to the proper inflation pressure (b) 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 tyre side
(c) or on the type label. 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 (d). 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 (e) gives the most common pressure values in terms of
both systems.
a
| 72 ENGLISH
b c
OWNER'S MANUAL 2021 | ROAD BIKE