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6.4. Shimano Di2
Shimano’s Di2 is the electronic version of the high-end drive groupset
from Shimano. Instead of cables the signal is transmitted by wires. The
rear and the front derailleurs are moved by small electrical motors. In case
of an oblique run of the chain the Di2 front derailleur is readjusted auto-
matically to avoid dragging noises and unnecessary wear.
The power supply is provided by a rechargeable battery that is mounted
to the frame or in the seat post.
6.4.1. Checking and Readjusting the Electric Gears
Clamp your bicycle into a workstand or ask a helper to hold your bicycle.
Turn the crank slowly and press the one of the two shifting switches re-
peatedly until the chain runs either on the outer or on the inner sprocket.
Adjust the limit stop to make sure the chain does not move beyond the
sprocket. Repeat the aforementioned procedure in the other extreme po-
sition.
Shift the gear to the largest sprocket and to the smallest chainring. Turn
the crank slowly backwards and check whether there is enough space be-
tween the pulley and the large sprocket. If this is not the case, turn the
bolt positioned in the rear clockwise.
Leave the chain on the chosen gear and adjust the front derailleur with
the bolt positioned towards the outside. The inner guide plate must be
positioned close enough to the chain to make sure the chain doesn’t fall
down and with sufficient place to make sure it doesn’t drag.
Shift to one of the medium gears. Press the button at the front switch
under the handlebars until the control lamp illuminates red. The rear de-
railleur can be finely adjusted now. Turn the crank and listen to the noise
of the chain while running. If the chain doesn’t roll off noiseless, press the
front button. With every push the rear derailleur moves inward by one
decimillimeter. If the noise gets louder, press the rear button.
The rear derailleur moves towards the outside in steps of one decimilli-
meter. Once the chain runs quietly press the button at the switch once
again – the red lamp goes off. Finish by shifting through all the gears to
check the proper functioning.
To adjust the limit stops follow the instructions described in chapter
“Checking and Readjusting the Mechanical Gears”.
The Gears
Danger:
Before using your new Di2 be
sure to go on a test ride in a
place free of trac and read
the operating instructions of
the gear manufacturer on the
STEVENS CD-ROM.
In case you want to change the function of the control buttons, ask your
bicycle dealer for help. The change has to be done with a special test de-
vice from Shimano which is also used for troubleshooting.
37


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