Figure 22/2
Figure 22/1
There are great differences between the methods used to set the
different systems. Usually two markings need to be aligned on the hub
or the Bowden cable. With hub gears, too, the required speed is set
through the correct tension of the shift cable. To set the shifting path,
most grip shifts are equipped with an adjustment screw, with the
exception of the 14-speed “Rohloff” hub gear design, the so-called
“Speedhub 14/500”. Due to the relatively small differences between
speed settings, this hub gear is designed primarily for the needs of
mountain bike riders who prefer a sporty riding style, but it is also
suitable for those using of touring and trekking bikes.
Correctly setting the shifter requires dexterity and experience. If
you would rather not perform this setting by yourself, turn to a
specialist service centre. An incorrectly adjusted shift system can cause
serious mechanical damage to your bicycle. To ensure the correct
setting, please read the user guide provided by the manufacturer of the
shift system.
Hub gear
The epicyclic gearing inside the rear hub controls the gear ratio
between the ring gear and the hub. The inner sun gear uses an arm
to shift between gears (3-speed hub gear).
This gear design is becoming increasingly popular due to its
minimal maintenance need.
Thanks to its integrated design, the greatest part of the gear system
is located inside the hub, which makes it almost fully resistant to
dust and other forms of contamination. A great variety of hub gears
can be found on the market today, from which the most widely used
are the products of SRAM and SHIMANO. With 3-, 4-, 5-, 7- or 8
speeds, an automatic shifting system and different brake systems
(e.g. rim brakes), these shift systems can satisfy every individual
need.
A further advantage of hub gears is that the chain is not actively
involved in the shifting process, but always moves along a straight
line, which greatly reduces its wear in comparison with external shift
systems.
Nowadays, almost all hub gears are controlled by a grip shift which
indicates the speed setting.
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