Operation Manual
104
9. If the leak is on the outside:
• Hold the inner tube next to the rim with a tyre, as it was mounted. Check the area of the tyre where
the hole is located in the inner tube. Often there is a thorn, a small stone or glass splinter in the tyre.
CAUTION Danger of cuts
If you feel the inside of the tyre with your thumb or fi nger, you might cut yourself on sharp-
edged objects if these are still in the tyre.
• Avoid moving your thumb and fi ngers quickly along the inside walls of the tyre.
• You should feel the walls of the tyre with extreme caution.
10. Remove the item causing the problem carefully with your fi ngernail, penknife or similar item. If the tyre
has been damaged or cut over a large area, it also has to be renewed.
If a tyre change is needed:
NOTE:
A new tyre is required if the tyre is visibly damaged and this damage goes beyond a small puncture.
11. Remove the old tyre completely from the rim.
12. Mount the new tyre with one side on the rim. Make sure that the arrow indicating the direction of move-
ment on the tyre (if present) is pointing in the direction of rotation when the bike is ridden.
If no tyre change is needed:
13. Pump up the new inner tube somewhat, so that it takes on its fi nal shape.
14. Insert the valve through the valve hole in the rim. The valve must be pointing towards the middle of the
wheel.
15. Now press the side of the tyre which is still outside the rim into the tube protector at the level of the
valve.
16. Press the external sides of the tyre into the tube protector at the same time around the circumference.
Start at the valve.
17. Opposite the valve the force required to press the tyre in may be greater. Use the tyre irons for this.
Make sure that you do not damage the inner tube.
18. Pump up the inner tube slightly.
19. Move the tyre to and fro around the circumference at right angles to the direction of travel. Ensure that
the tyre is positioned evenly on the rim and that the inner tube is not visible at any point.
20. Infl ate the tyre up to the prescribed air pressure. The permitted air pressure is indicated on the side wall
of each tyre.
21. Mount the wheel in accordance with section 13.1.2, Installing the front wheel and 13.1.4, Installing the
rear wheel.
22. Check the tyres. See section 7.1.2.4, Checking the tyre.