110
Wheels and tyres
CauTion
Burst tyres caused by penetrating foreign bodies.
Risk of accident and injury!
•
Check the tyres regularly for signs of damage and wear.
•
If you do not have the necessary expertise and the
required tools, you should ask your specialist dealer to
replace damaged or worn tyres.
noTiCe
Damage caused by fitting differently sized tyres than
those originally intended for use.
Risk of damage!
•
Consult your specialist dealer if you have any questions
about the correct tyre size.
The tyres keep the bicycle securely gripping the road. They trans-
fer the driving forces created by pedalling to the road and cushion
riding on uneven road conditions.
Different types of tyres are used depending on the intended use
of the bicycle.
The size of the tyre is indicated on the side of the respective tyre.
Various different details may be included here, for example:
–
Size in millimetres. If the tyre is described as ‘52-559’, this
means that the tyre is 52 mm wide when fully inflated and has
an inner diameter of 559 mm.
–
Size in inches. If the tyre is described as 26
×
2.35, this means
that the tyre is 2.35″ wide when fully inflated and has an inner
diameter of 26″.
With the exception of tubular tyres and UST tyres, rims and tyres
alone are not airtight. An inner tube filled through a valve is used
to keep the air inside the tyre.
1.
Check the tyres for cracks and damage caused by foreign
bodies.
2.
Check whether the profile of the tyres can be clearly felt.
•
If a tyre shows signs of cracks, is damaged or the profile depth
is insufficient, have the tyre replaced by your specialist dealer.
13.2.1.1
Valve types
All bicycles are fitted with one of the following types of valve (see
Fig. “Valve types”
):
–
Standard bicycle valve (Dunlop): held in place with a lock nut,
8.5 mm rim hole, maximum pressure 6 bar.
–
Schrader valve: held in place by a metal pin in the valve,
8.5 mm rim hole, maximum pressure 10 bar.
–
Presta valve: held in place by a metal pin in the valve, 6.5 mm
rim hole, maximum pressure 15 bar.
All three types of valve include a valve cap to prevent dirt from
getting into the valve.
