Bedienungsanleitung Stevens Allround Trekking Bikes - 2014 (Seite 41 von 83) (Englisch)

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The Wheels

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 ten-

sion 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 pad or, in the case of

disc brakes, between frame and rim or tyre. If the gap varies by more

than a millimetre, you should ask a skilled mechanic to true up the

wheel. Untrue rims can be an indication of tyres with ruptured sides or

broken axles or spokes.

7.3. Wheel Fastening with Axle-Nuts, Quick-

Releases or Shimano Thru Axles

The wheels are fastened with the hub axles to the frame. The axle is

clamped tight in the drop-outs by means of hexagon nuts or a quick-re-

lease.

7.3.1. Wheel Fastening with Axle-Nuts

Axle-nuts are usually released or tightened with a 15-mm-open-end

wrench.

You should take this tool with you on a cycle tour, as punctures can hard-

ly be repaired without this tool.

7.3.2. Wheel Fastening with Quick-Releases

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 reten-

tion mechanisms essentially consist of two manipulable parts:

a. The hand lever on one side of the hub which creates a clamping force

via a cam when you close it.

b. The tightening nut on the other side of the hub with which the

preload on the threaded rod is set.

Danger:

Do not ride with untrue

wheels. In the case of

extreme side-to-side wob-

bles, 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!

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