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39
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. Although
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 on the road which is absolutely necessary for
braking, accelerating and taking turns. In addition, they provide smooth
running and riding comfort by absorbing inferior shocks. The cross-coun-
try 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 different 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 pre-
cise, the number sequence 23 - 622 means that the tyre is 23 mm wide
when fully inflated and has an inner diameter of 622 millimetres. The oth-
er designation for this tyre reads 23 x 7/8 which refers to inches.
Tyres have to be inflated to the correct air pressure in order to work prop-
erly. Adequately inflated tyres are also more resistant to flats. An insuffi-
ciently inflated inner tube can easily get pinched (“snake-bite”), when it
goes over a sharp kerb.
The Wheels
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 and is therefore best for light-weigh riders
riding over uneven roads. Rolling resistance decreases with growing pres-
sure, but so does comfort. A high tyre pressure is therefore best heavy-
weight riders riding on tarred roads. A higher pressure hardly means a
lower resistance, it only makes the tyre harder.
Caution:
Observe the specications
on the maximum pressure in
the operating instructions of
the rim manufacturer on the
STEVENS CD-ROM.
40


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