108
Wheels and tyres
13
Wheels and tyres
13.1
Wheels
13.1.1
Basic information
The wheel is made up of a hub, spokes and a rim. The tyre is fitted
in the rim of the wheel. Depending on the bicycle model, an inner
tube is fitted inside the tyre. The front wheel and its tyre together
are referred to as the front wheel; the rear wheel and its tyre are
referred to as the rear wheel.
Fig. Cross-section of a wheel and tyre (example)
1 Spoke
2 Rim
3 Rim tape
4 Rim wall
5 Inner tube
6 Tyre
7 Tyre tread
1
2
4
5
6
7
3
–
If an inner tube is included, rim tape is also fitted around the
inside of the rim to protect the tube from the rim base and the
spoke nipples.
–
If the tyre does not have an inner tube, road bikes are fitted
with so-called tubular tyres or mountain bikes are fitted with
UST tyres (Universal System for Tubeless).
The wheels are exposed to considerable stresses and strains due
to the weight of the rider and their luggage, as well as the uneven
conditions of the road.
•
After an initial riding period (at the latest after cycling 200 km,
using the bike for over 15 hours or after 2 months – depending
on which milestone is achieved first), you should get your spe-
cialist dealer to check the wheels and re-centre them.
•
You should check your wheels regularly following the initial
riding period.
13.1.1.1
Rims and spokes
WaRninG
Risk of falling due to blocked rim brakes or wobbling
wheels caused by the rims becoming laterally out of true.
Risk of accident and injury!
• Get your specialist dealer to true any untrue wheels.
