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7.2. Rim Trueness, Spoke Tension
The spokes connect the rim to the hub in the middle of the wheel. An even
spoke tension makes for the true running of the wheel. If the tension of
individual spokes changes, e.g. as a result of riding too fast over a kerb
or due to spoke breakage, the tensile forces acting on the rim become
unbalanced and the wheel will no longer run true.
The functioning of your bicycle may even be impaired before you notice
the wobbling appearance of a wheel that has gone out of true.
With rim brakes the sides of the rims also serve as braking surfaces. An
untrue wheel can impair the braking effect.
It is therefore advisable to check the wheels for trueness from time to
time. For this purpose lift the wheel from the ground and spin it with
your hand. Watch the gap between rim and brake pads. If the gap varies
by more than a millimetre, you should ask a skilled mechanic to true up
the wheel.
7.3. Wheel Fastening with Quick-Releases
The wheels are fastened with the hub axles to the frame. Each axle is
clamped tight in its drop-outs by means of a quick-release.
If you have a quick-release, you do not need any tool. Just release the
lever, unscrew it a few turns, if necessary, and take out the wheel. This is
just as easy for a potential thieve!
For this reason you can replace the quick-releases by special locks. They
can only be opened and closed with a special, coded key or an Allen key.
The front wheel has normally drop-out catches which are intended to
hold the wheel safe in case the fastening gets loose.
Although the use of quick-releases is theoretically very easy, they have
repeatedly been the cause of accidents as a result of a wrong handling.
Quick-release retention mechanisms essentially consist of two manipu-
lable parts:
1. The hand lever on one side of the hub which creates a clamping force
via a cam when you close it.
2. The tightening nut on the other side of the hub with which the preload
on the threaded rod is set.
The Wheels
Danger:
Do not ride with untrue
wheels. In the case of extreme
side-to-side wobbles, the
brake pads can miss the rim
and get caught in the spokes!
This normally results in an
immediate blocking of the
wheels. Risk of falling!
Note:
Truing wheels is a difficult job
which you should definitely
leave to your STEVENS dealer!
42


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