Biketec AG Flyer, Operating Manual

Page: 46 / 94

42
Wheels
Modern rims from size 24” up-
wards have a marking which
shows rim wear. On the rim
surface there are coloured points or
grooves embossed which help you
gauge the level of wear.
If these markings are worn away or
no longer recognisable in one or more
places, the rim has to be replaced.
There are embossed markings which
disappear or colourful markings which
become visible if the rim has been used
for some time. If they appear, the rims
also have to be replaced. Please allow
a specialist retailer to check the rims at
the latest when you have worn out two
pairs of brake pads.
Tyres are available in various
dimensions. The tyre dimen-
sions are stated with normed
information.
• Example 1 : “46-622” states that the
tyres have a width of 46 mm and the
rim has a diameter of 622 mm
•
Example 2
: “28 x 1.60 inches” states
that the tyre has a diameter of 28
inches and a width of 1.60 inches
In general, air pressure is stated in the
unit PSI. A table for converting the air
pressure from PSI into bar is printed in
chapter 33.4 “Technical information”.
Tyres are subject to wear due
to their constant use. Check
the profile depth at regular in-
tervals, as well as the tyre pressure and
condition of the side walls of the tyre.
Grooves as a wear indicators
19. Tyres and inner tubes
19.1 Tyres
Tyres are produced in different types. The tyre
profile differs from type to type. This governs
how effective the tyres are on different surfac-
es as well as the rolling friction.
The permitted tyre pressure
may not be exceeded when
inflating the tyres. Otherwise
this could lead to the danger of a tyre
exploding.
The tyres have to be pumped up with
at least the stated minimum tyre pres-
sure. If the tyre pressure is too low,
there is a possibility that the tyre could
free itself from the rim.
On the side surface of the tyre, there
is information on the maximum permit-
ted tyre pressure and generally also on
the minimum permitted tyre pressure.
If you replace the tyres, only ex-
change them for the same model with
the same dimensions and profile. The
bicycle’s handling could otherwise be
negatively affected. This can in turn re-
sult in accidents.