Operation Manual

ROTWILD 2008/2009 – Ä nderungen vorbehalten / Subject to change _ 59
► Tyres
Tyres play an important role in ensuring ride comfort and grip on roads and tracks.
Off-road grip is provided by the tyre tread. Please follow these basic rules:
Rule 1: High tyre pressures are not suitable for off-road use. The
maximum and minimum pressure permitted for your tyres is
indicated on the tyre walls. Avoid leaving your MTB/Racing bike in
direct sunshine, the tyres may suffer and the pressure will
increase. With time, tyres always lose some air; this is particularly
the case if you use latex inner tubes. Check your tyre pressure
regularly, and pump up your tyres to the required pressure if
necessary. A conversion table for the two standard units of
pressure may be found in the care and maintenance section of
this manual. Pressure loss is greater the higher your tyre pressure
is.
Rule 2: Wide tyres provide better grip and rolling than narrow ones. Wide
tyres are particularly recommended for riding in autumn and
winter. Further, wide tyres roll better – assuming the same
pressure – than narrow tyres. The wind resistance of wide cross-
section tyres only plays a minor role at extremely high speeds.
Treadless tyres are the best solution on metalled surfaces (streets,
surfaced tracks).
Used tyres don’t belong in the dustbin. They can be completely
recycled, please ask your dealer!
There are matching tubes for all sizes of tyre; butyl tubes stay
inflated better than latex tubes.
The dimensions of shells and tubulars must match!
► Inner tubes
Inner tubes have a virtually unlimited lifespan. In the case of a puncture a tube can
be repaired with a conventional puncture repair kit – they will then function just as
well as before. Please remember the following whenever you install a new tube:
• The tube should not be pinched between the rim and the tyre bead.
• The tyres should not be unbalanced after installation, e.g. when one part of the
tyre is higher.
• The valve must be perpendicular to the rim.
• The rim tape must be suitable for high pressures, have the correct width, and
be undamaged and correctly installed.