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82
GEARS
CHECKING AND READJUSTING
SHIMANO Di2
The Di2 is the electronic version of the high quality
shifting groupsets from Shimano. Instead of cables
the signal is transmitted by wires. The rear and the
front derailleurs are moved by small electrical mo-
tors. With an oblique running chain the Di2 front
derailleur is even readjusted automatically to avoid
grinding noises and unnecessary wear.
The power supply is provided by a rechargeable bat-
tery that is mounted to the frame.
CONTROL
With the Di2 you no longer have to move inwards the
entire brake lever or the lever of the conventional
Dual Control shift lever from Shimano, but only to
gently push control buttons. Shifting with the oblong
control button on the side of the brake lever shifts to
the larger chainrings/sprockets. Pushing the trian-
gular control button that is located behind the brake
lever makes the chain move to the smaller chainrings/
sprockets.
There is the option to have the control button func-
tion changed by your bicycle dealer if desired. The
only thing necessary to do so is a special test device
from Shimano that is also used for troubleshooting.
Di2 front derailleur
Rear derailleur
Before using your new Di2-shifting sys-
tem, be sure to do a test ride in an area free
of traffic.
Be sure to read the enclosed operating
i
instructions of the gear manufacturer.
BATTERY
A new, fully charged battery allows you to ride approx.
1,000 km (620 miles). An about 25 % charged battery
still runs approx. 250 km (150 miles).
With a weak battery the front derailleur is the first
component to stop working, followed by the rear de-
railleur. In this condition you can still ride some more
kilometres and shift with the rear derailleur. The bat-
tery should, however, be recharged as soon as pos-
sible. When the battery is empty the rear derailleur
remains in the previously chosen gear. Shifting into
another gear is impossible from that moment on!
You can check the battery's state of charge at any
time. Push one of the control buttons and hold it 0.5
seconds at least. The LED on the control unit indi-
cates the state of charge:
- green light is one for about 2 seconds:
battery's state of charge 100 %
- green light blinks 5 times:
battery's state of charge about 50 %
- red light is one for about 2 seconds:
battery's state of charge about 25 %
- red light blinks 5 times:
battery's state of charge empty
Over time, the capacity of the battery will degrade
and so will the distance you will be able to ride. This
process is inevitable. When the achievable distance
you will be able to ride no longer meets your require-
ments, you must replace the battery.
CHECKING AND READJUSTING
GEARS
83
Di2 battery
Recharge the battery only with the charger
delivered together with the battery!
Keep a nearly charged battery (50 % or
more) that is not used for a longer period
of time in a dry, cool place and out of the reach of
children. After six month at the latest you should
check the state of charge. Mount the protective
cover on the battery's contact area prior to stor-
age.
Recharging the (empty) battery will take
i
about 1.5 hours.
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