49
wheeler dirt, freeride, downhill bikeS
– Special featureS
Dirtbiking, freeriding, fourcross, dual slalom and downhill riding are
among the most challenging types of cycling. Jumps, riding the stairs,
downhill races and sharp bends in difficult or extremely rough terrain
etc. are an undue stress for rider and material and require a WHEELER
bicycle that is highly durable and, if necessary, fitted with an efficient
suspension system.
A cross-country, touring or marathon mountain bike would fail, resulting
in a serious accident. Ask your WHEELER bicycle dealer for a bicycle
that is suitable for the type of sport you intend to perform.
Even though the above-mentioned specialized types of WHEELER bicy-
cles are built for sport cycling and hard use, their resistance to stress
is limited.
In particular the following actions may cause an undue stress for the
material and result in failure:
- Incorrect jumps on sharp edges, jumps with a landing on the front
wheel, too short jumps or tricks that are not completed before the
landing
- Landing on the counter slope or between two slopes; on flat ter-
rain: jumps with rotation crosswise to the lane or with the hands
removed from the handlebars/the feet removed from the pedals
Be sure to also avoid the following, as this would put too much stress
on the material resulting in premature wear or failure:
- Undue stress for the chain by riding with too low chain tension
- Inappropriate grinding (sliding on chain or chainring or sliding on
frame and drop-outs)
- Undue stress for the wheels by riding with too low air pressure
- Undue stress for the frame and bicycle parts by riding with a too
soft suspension
a
Dirt, fourcross, dual slalom, downhill and freeride
WHEELER
bicycles are true-bred sports bicycles
(e-h)
. For your own
safety, do not overestimate your cycling skills. Please note
that though looking easy the tricks of a professional are
hazardous to your life and limb. Always protect yourself
with appropriate and suitable clothing.
a
Due to the specific intended use, some dirt bikes are fitted
with only one brake. Do not ride these
WHEELER
bikes on
public roads, but only on signposted tracks and lanes.
g
If carbon components on your
WHEELER
bicycle produce
any creaking or cracking noises or show any external sign
of damage, such as gouges, cracks, dents, discoloura-
tions etc., do not use the bicycle any longer. Contact your
WHEELER bicycle dealer immediately; he will check the
component thoroughly.
g
Do not combine carbon handlebars with bar ends, unless
they have been specifically approved. Do not shorten car-
bon handlebars or clamp the brake and shift levers more
in the middle than indicated or needed.
risk of breakage
!
g
Make sure all carbon clamping areas are absolutely free of
grease and other lubricants. Grease would penetrate the
surface of the carbon material, reducing the coefficient of
friction, a reliable clamping within the prescribed torque
value being hence no longer provided. once greased, car-
bon components may never again ensure reliable clamping.
Use a special carbon assembly paste
(a+b)
instead as of-
fered by various manufacturers.
a
Do not clamp a carbon frame or seat post in the holding
jaws of a workstand! The components may sustain dam-
age. Mount a sturdy (aluminium) seat post
(c)
instead and
use it to clamp the frame, or chose a work stand that holds
the frame at three points inside the frame triangle or that
clamps the fork and bottom bracket shell.
a
Most clamps of bicycle carrier systems are potential sourc-
es of damage to large-diameter frame tubes! As a result
thereof carbon frames can fail during use without previous
warning. Suitable, special-purpose models are, however,
available in the car accessory trade. Inform yourself there
or ask your
WHEELER
bicycle dealer for advice.
i
Protect the exposed areas of your carbon frame (e.g. the
underside of the down tube) against rubbing cables or
stone chips with special pads
(d)
your WHEELER bicycle
dealer keeps for sale.
a
b
c
d
48
e
f
g
h
Содержание Cross
Страница 70: ......
