Bedienungsanleitung Bergamont CITY - 2019 (Seite 42 von 79) (Englisch)

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ENGLISHENGLISH TREKKING AND TREKKING‑PEDELEC | ORIGINAL OPERATING INSTRUCTIONSORIGINAL OPERATING INSTRUCTIONS | TREKKING AND TREKKING‑PEDELEC

b ca e fd

If you want to mount a new tyre, you need to observe 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 standardized size in millimetres which is more precise, e.g.

the number sequence 40-622 (d) means that the tyre is 40 mm in width when fully

inflated and has an inner tyre diameter of 622 millimetres. The other size is indicated

in inches (e.g. 28x1.5”).

Tyres must be inflated to the proper inflation pressure to provide an optimal

compromise between smooth running and riding comfort. Properly inflated tyres are

also more resistant to punctures. An insufficiently inflated tyre 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 (e). 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 on level ground decreases with growing pressure, but so does

comfort. Highly inflated tyres are therefore most suitable for heavy riders and for

riding on tarred roads. Therefore, adjust the pressure to your weight and your riding

habits.

Inflation pressure is often given in the old system of units, i.e. in psi (pounds per

square inch). The table (f) gives the most common pressure values in terms of both

systems.

Clincher and folding tyres 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.

Rims of clincher and folding tyres require in general a high-value rim tape over the

complete width of the rim base. This rim tape protects the inner tube from the braking

heat which could make the tyre burst.

DANGER!

Replace tyres with a worn tread or with brittle or frayed sides. Dampness and dirt

penetrating the tyre can cause damage to its inner structure. The tube might burst.

Risk of falling!

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 tube in the case of the most common system, i.e. the

clincher or folding tyres. There is a rim tape running around the rim well (a) to protect

the sensitive tube against the edges of the rim trough, which are often sharp.

Another common system comprises tubeless tyres which require specific rims

without boreholes and firmly screwed valves.

The wheels are subjected to considerable stress through the weight of the rider and

any carried luggage as well as through bumpy road surfaces and terrain. Although

wheels are manufactured with great care and delivered accurately trued, spokes and

nipples can lose a little tension on the ﬁrst kilometres. Ask your BERGAMONT dealer

to check and true up the wheels after you have bedded them in over about 100 to 300

kilometres or 5 to 15 hours of use.

After the bedding-in period, check the wheels regularly. It will, however, rarely be

necessary to retighten the spokes (b).

CAUTION!

Truing (retruing) wheels is a difﬁcult job which you should definitely leave to your

BERGAMONT dealer.

NOTE!

Tubeless tyres will not be considered any further in the following. Read the

manuals of the rim manufacturer, the tyre producer and ask your dealer for advice.

NOTES ON TYRES, INNER TUBES, RIM TAPE, INFLATION PRESSURE

The tyres 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 tyre carcass, the rubber compound and the

tyre tread. Your BERGAMONT dealer will be pleased to help you choose from the

numerous types of tyres (c).

psi bar psi bar

45 3.1 75 5.2

50 3.4 80 5.5

55 3.8 85 5.9

60 4.1 90 6.2

65 4.5 95 6.6

70 4.8 100 6.9

| 8 2 8 3 |

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