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SHIMAno Di2 AnD HUB GEARS
The Di2 is the electronic version of the high-quality drive systems from
Shimano. Instead of using Bowden cables, signals are transmitted
by cable. The front and rear derailleurs or the gears in hub gears are
moved by small electric motors.
The power for this is supplied by a rechargeable battery that is attached
to the frame.
a
operation
Differing from the case with conventional shifters from Shimano, on the
Di2 there are just two control buttons
button switches to a higher gear, the other one to a lower gear.
G
I
b
MULTI-SPEED HUBS (InTERnAL GEAR HUBS)
operation and Control
The advantages of multi-speed hubs are their enclosed design. Unlike
derailleur gears the gear drive is within the hub body, only the primary
ratio from the chainring to the sprocket being outside. What is more, all
the gears can be shifted through with one gear shifter (c).
Provided that it is serviced regularly, the drive chain
c
paratively longer service life. And this applies even more if it is pro-
tected from the influences of the weather by a sealed chain box.
With multi-speed hubs normally the power transmission and the gear
ratio adjustment is guaranteed via one or several planetary gears,
depending on the number of gears. To change gears the pedal force
should be reduced shortly.
d
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(a+b)
to press. The one control
Make a test ride in a place free of traffic before you use your
new Di2 gears.
Read the operating instructions of the gear manufacturer,
which you can find on the enclosed CD.
(d+e)
In contrast to derailleur gears, multi-speed hubs cannot only be com-
bined with manually actuated brakes (rim, drum, roller or disc brakes),
but also with back-pedal brakes (roller or drum brakes) that are actu-
ated by a reverse rotation of the pedals. The most effective braking is
achieved with the pedals in the horizontal position (f).
I
There are some multi-speed hubs where the effects of the
back-pedal brake depend from the selected gear. Also ob-
serve the operating instructions of the manufacturer, which
are on the enclosed CD, and make yourself familiar with the
brake function before using your bicycle on public roads.
I
Removing and mounting the wheels
with derailleur gears. With this fact in mind read the chapter
"tyre puncture" and observe the notes given in the operat-
ing instructions of the manufacturer, which you can find on
the enclosed CD.
A
Always make sure changing gears makes as little noise as
possible and is absolutely jerk-free.
A
Make yourself familiar with the operation of your gears in
a place free of traffic and practise operating the shifters or
the twist grips as well as the brake system, before using
your bicycle on public roads.
Check, Readjustment and Maintenance
Multi-speed hubs require only little maintenance and need not be ad-
justed very often. Check the chain tension (h), in particular when re-
moving and mounting wheels, and read the chapter "chain - care
and wear".
has a com-
If the indexed gear change does not work trouble-free, then contact
your WHEELER bicycle dealer.
Adjusting multi-speed hubs
Switch to the 4th gear. Look from above at the right-hand side of the
hub. There you can see two yellow markings. These two markings must
be at the same height, i.e. they must produce a line.
(g)
is not the same as
e
f
f
g
h
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