Bedienungsanleitung Stevens Race - 2014 (Seite 40 von 81) (Englisch)

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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. 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.

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