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Winora Algemene Manual

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7 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 inner tube. There is a rim tape running
around the trough of the rim to protect the sensitive inner tube against the
spoke nipples and the edges of the rim trough, which are often sharp .
The wheels are subjected to considerable stress through the weight of the
rider and any carried baggage as well as through bumpy road surfaces and
terrain. Although wheels are manufactured with great care and delivered
accurately trued, this does not prevent the spokes and nipples from losing
a little tension on the first kilometres/miles. Ask your bicycle dealer to check
and true up the wheels after you have bedded them in over about 100 to
300 kilometres (60 to 180 miles) or 5 to 15 hours of use.
Check the wheels regularly, especially after bedding them in. It will rarely be
necessary to tighten the spokes .
 

The tyres should provide the friction needed for carrying the bicycle forward
on the riding surface. At the same time they should grant minimum rolling
friction 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 type of tyre profile. Your bicycle dealer will be
pleased to help you choose from the numerous types of tyres .
If you want to replace a tyre, you need to consider 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 52-559 means that the tyre is
52 mm wide when fully inflated and has an inner diameter of 559 millimetres.
The other size is indicated in inches (26x2.35).
Mounting a new tyre of another dimension might possibly cause
the tip of your shoe to touch the front wheel while steering.
During compression of the suspension system a wheel can get
jammed, as well. Risk of an accident!
a
b
c
d
psi bar psi bar
30 2,1 90 6,2
40 2,8 100 6,9
50 3,5 110 7,6
60 4,1 120 8,3
70 4,8 130 9,0
80 5,5 140 9,7
Tyres have to be inflated to the correct air pressure. Properly inflated tyres
are also more resistant to punctures. An insufficiently inflated inner tube 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 . 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 decreases with growing pres-
sure, but so does comfort. Highly inflated tyres are therefore most suitable
for heavy riders and for riding on tarred roads.
Inflation pressure is often given in the old system of units, i.e. in psi (pounds
per square inch). The table below  gives the most common pressure
values in terms of both systems.
Tyres allowing an inflation pressure of 5 bars or more have to
be mounted on hook bead rims, identifiable by the designation
“C“. If you are in doubt or if you have any questions, please
contact your bicycle dealer!
The tyre 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.
This does not apply to the following tyre systems:
· The tubeless wheel/tyre systems (tubeless/UST-tyres/NoTubes sys-
tems). In this case, the rim and the tyre hold the air without an inner tube.
For more information read the chapter on UST tyres further below or the
respective instructions, before doing any work on such kind of tyres.
· Tubular tyres for road racing bicycles. This tyre provides an airtight de-
sign without inner tube. In case of a puncture there is no inner tube to be
removed or repaired. This particular design requires special rims without
rim flanges.
If you have a bicycle with tubeless tyres, please read the in-
structions of the tyre/rim manufacturer.
Treat your tyres well, in particular avoid sharp edges where pos-
sible! Never inflate your tyres beyond the maximum permissible
pressure, otherwise one of them might burst or come off the rim
during the ride. Risk of an accident!
There are three valve types in general use on today’s bicycles:
1. Sclaverand or Presta valves : This type is nowadays used on almost all
types of bicycles. It is designed to withstand extremely high pressures.
2. Schrader or car valve : This is an adapted car tyre valve which is
mainly used on mountain bikes.
3. Dunlop or Woods valve, the usual valve.
These three valve types are fitted with a plastic cap to protect them from
dirt.
a
b
c
d
… 60 …


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