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7. The Wheels
The wheels of your bicycle create the contact to the road or track you are
riding on. They are subject to considerable stress through the weight
of rider, the luggage and through bumpy road surfaces or ground. Al-
though the wheels are manufactured with great care and delivered
accurately trued, this does not prevent the spokes from losing a little
tension on the first kilometres. Ask your STEVENS dealer to true up the
wheels after you have bedded them in over about 100 to 300 kilometres
(60 to 180 miles). Check the wheels regularly after you have run them in.
It will rarely be necessary to tighten the spokes.
The wheel consists of hub, spokes and rim. The tyre is mounted onto the
rim so that it encases the inner tube. There is a rim tape running around
the base of the rim to protect the sensitive inner tube against the spoke
nipples and the edges of the rim base, which are often sharp.
7.1. Tyres, Tubes, Rim Tapes, Valves, Inflation
Pressure
The tyres provide grip and traction on the road which is absolutely nec-
essary for braking, accelerating and taking turns.
In addition, they provide smooth running and riding comfort by absorb-
ing inferior shocks. The cross-country mobility or the inclination of the
road depends on the nature of the tyre carcass and the tyre tread. As
some of the requirements are mutually exclusive, there are many differ-
ent tyre types for different uses. Ask your STEVENS dealer to inform you
about the best tyre for you.
If you want to replace a tyre, you need to consider the actual size of the
old tyre. It is marked on the side of the tyre. There are two designations:
One of the sizes is the standardised size in millimetres which is more
precise, the number sequence 42 - 622 means that the tyre is 42 mm
wide when fully inflated and has an inner diameter of 622 millimetres.
The other designation for this tyre reads 28 x 1.60 which refers to inch-
es. Tyres have to be inflated to the correct air pressure in order to work
properly. Adequately inflated tyres are also more resistant to flats. An
insufficiently inflated inner tube can easily get pinched (“snake-bit-
ten”), 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 specifi-
cations makes for better cushioning and is therefore best for off-road
cycling. Rolling resistance decreases with growing pressure, but so does
comfort. A high tyre pressure is therefore most suitable for riding on
tarred roads. A higher pressure hardly means a lower resistance, it only
makes the tyre harder.
Ask your STEVENS dealer for advice. Inflation pressure is often given in
the old system of units, i.e. in psi (pounds per square inch). The table
on the right gives the most common pressure values in terms of three
systems. 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.
The tube is pumped up via a valve.
The Wheels
39


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