Operation Manual
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2. Remove any foreign bodies (thorns, small stones, pieces of glass or similar items) by hand or carefully
with a small screwdriver. Check if air is then leaking out.
• If air is leaking out the inner tube has to be renewed. You may change the inner tube of the wheel
yourself. For instructions on how to do so, see section 15.5.1, Changing the inner tube and tyre.
7.1.2.5 Checking that the tyre is correctly fitted
1. Lift the front wheel.
2. Turn the front wheel by hand. The tyre must run smoothly. There must be no wobble or eccentricity.
3. Check the back wheel in the same way as the front wheel.
7.1.2.6 Checking valve position (not on tubeless tyres):
1. If necessary, remove the valve nut.
2. Check the valve position: The valves must be pointing towards the middle of the wheel.
7.1.2.7 Checking the air pressure
As a result of low tyre pressure
• the tyre and inner tube may move on the rim and result in the incorrect positioning of the valves. The valve
base may tear off during the journey and result in a sudden loss of pressure in the tyre.
• the tyre may come off the rim in curves.
• the likelihood of a breakdown is increased.
NOTE:
The required air pressure can vary by manufacturer and the model of tyre. Follow the manufacturer's instructions
for the correct tyre air pressure on the tyre side wall. If you have any questions, please contact your specialist bicy-
cle dealer. He or she will be pleased to advise you.
Some tyre pressures are indicated in “psi”. Convert the tyre pressure into bar using the following table.
psi
30 40 50 60 70 80 90 100 110 120 130 140
bar
2.1 2.8 3.5 4.1 4.8 5.5 6.2 6.9 7.6 8.3 9.0 9.7
Check the tyre pressure using a tyre pressure gauge. Suitable devices are available from specialist shops.
For details of their use, please refer either to the user manual supplied with the gauge, or consult your local
dealer.
For tyres with automatic valves you can also check and correct the air pressure at filling stations.
• If the pressure is too low: Increase the inflation pressure using a suitable pump.
• If the pressure is too high: Release the necessary amount of air via the valve, then check the inflation pres-
sure again.
NOTE:
A bike pump with pressure gauge allows you to check the inflation pressure while inflating. First allow a little air to
escape from the tyre, then inflate to the required value.
There are various types of valves (see section 4.7, Tyres). All valves can be fitted with a dust cap. In the case of a
Schraeder (Auto) valve or Dunlop valve, the pump head can be connected directly after removing the cap. In the
case of a Sclaverand (French) valve you first have to loosen the small lock nut on the valve as far as it will go, then
tighten it again completely after inflating the tyre. Have the use of the valves explained to you by your dealer.
7.1.3 Checking other points
1. Check whether there are any other loose items such as twigs, substance residues or similar items in
your wheels.
2. Remove such items carefully.
3. If you have had spoke reflectors fitted, check that these are firmly fitted in place.
4. If they are loose, please remove them completely.
5. Check whether your wheels have been damaged by these loose parts.
7.2 Inspecting the saddle and saddle post
WARNING Danger from serious falls
If the insertion depth of the saddle post is too small, it may be released from the frame while you are rid-
ing and lead to dangerous situations, falls and accidents. Furthermore, if the insertion depth of the saddle
post is too small, this may cause damage to the saddle post and frame.
• Pay attention to the correct insertion depth of the saddle post.