Gear Position Control - Shimano XTR Di2 Dealer's Manual

How to operate

Gear position control

„ Gear position control
This gear-shifting system is programmed to prevent shifting into gears that would lower the chain tension.
Therefore, if you try to shift into such gears, shifting may function differently from the basic operations.
The illustration below shows the gear positions that would lower the chain tension and the shifting operations performed when you shift into those
gears.
< Points to remember when shifting the front derailleur >
When you shift into the smallest chainring, shifting is controlled as follows.
GS
(a)
< Points to remember when shifting the rear derailleur >
When the chain position is in the smallest front chainring, gear shifting is controlled as follows.
GS
(a)
SGS SGS
(b) (a)
SGS SGS
(b) (a)
When the chain is in the range specified
in (a) or (b), operating the shifting switch
does not shift the front derailleur.
Instead, the rear derailleur is shifted
down through two gears.
When the chain position is outside the
range specified in (a) or (b), operating
the shifting switch shifts the front
derailleur to the smallest chainring.
(a)
From the smallest to the third
sprocket.
(b)
Smallest sprocket
When you try to shift into a smaller rear
sprocket, operating the shifting switch
does not shift the rear derailleur into the
range specified in (a) or (b).
(a)
From the smallest to the third
sprocket.
(b)
Smallest sprocket
44
NOTE
•
It is not recommended to use triple front
chainrings with a GS rear derailleur.
•
If you use combinations of front and rear
derailleurs besides those recommended,
the shifting-restricted range may become
larger.