Centurion ROAD BIKE ISO 4210-2, Руководство пользователя

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a
b
c
d
The wheels and the tires
The wheel consists of the hub, the spokes and the
rim. The tire is mounted onto the rim so that it encas-
es the tube in the case of the most common system,
i.e. the clincher or folding tires. There is a rim tape
running around the rim well to protect the sensitive
tube against the edges of the rim trough, which are
often sharp (a) .
Another system comprises the tubular tires which
are glued on specific rims. A third system comprises
tubeless tires which also require specific rims.
The wheels are subjected to considerable stress
through the weight of the rider and any carried bag-
gage as well as through bumpy road surfaces and
terrain. Although wheels are manufactured with great
care and delivered accurately trued, spokes and nip-
ples can lose a little tension on the first kilometers.
Ask your CENTURION dealer to check and true up
the wheels after you have bedded them in over about
100 to 300 kilometers or 5 to 15 hours of use.
After the bedding-in period, check the wheels regu-
larly. It will, however, rarely be necessary to tighten
the spokes (b) .
A
Truing (retruing) wheels is a difficult job
which you should definitely leave to your
CENTURION dealer.
Tires, inner tubes, rim tape, inflation
pressure
The tires 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 tire carcass, the rubber compound and the tire
tread. Your CENTURION dealer will be pleased to
help you choose from the numerous types of tires.
If you want to mount a new tire, you need to mind the
sizing system and the actual size of the old tire.
The latter is specified in two different units on the side
of the tire. One of the sizes is the standardized size
in millimeters which is more precise, e.g. the number
sequence 23-622 means that the tire is 23 mm wide
when fully inflated and has an inner tire diameter of
622 millimeters. The other size is indicated in inches
(e.g. 23x7/8 or 700x23c) (c) .
Tires must be inflated to the proper inflation pres-
sure (d) to provide an optimal compromise between
smooth running and riding comfort. Properly inflated
tires are also more resistant to punctures. An insuf-
ficiently inflated tire can easily get pinched (“snake-
bite”), when it goes over a sharp curb.
The air pressure recommended by the manufacturer
is given on the tire side or on the type label (e) . The
lower of the two pressure specifications makes for
better cushioning for lightweight riders and is there-
fore best for cycling on a rough surface.