Shimano Nexus Service Instructions Manual page 7

Shift timing adjustment dial (AUTO riding mode)
The timing for automatic shifting can easily be adjusted by turning the dial on the side of the computer unit
(AI-8S40).
Using dial to adjust shift timing
(Make adjustments while the bicycle is stopped.)
Set the dial to approximately the
middle position, set the Riding
mode to D, and then test ride
the bicycle.
If the load on your legs feels too
heavy or too light with the dial
set to this position, use step (1)
and step (2) below to search for the shifting point
that is most suitable for you.
The dial has 8 steps of adjustment.
Be sure to make adjustments with the cover
installed.
Shifting/Suspension Select Switch (Manual mode)
Rear gear shifting is basically carried out automatically, but manual shifting is also available for riders who
would like to make us of it.
Press the mode select switch to set the mode to manual (MANU).
Shifting
Operation
Suspension can be manually changed while in either automatic mode (AUTO) or manual mode (MANU), but if a
switch is used to make a change while in AUTO mode, the mode will be automatically changed to MANU mode.
Suspension
Operation
(1) If load on
legs feels heavy
Turn dial to the left
Pressing the + switch shifts to a higher gear (heavier, faster).
Pedalling now has the sensation of requiring more power, but
the legs turn through the rotation more slowly.
Pressing the - switch shifts to a lower gear (lighter, slower).
Pedalling now has the sensation of being lighter.
Pressing the HARD switch changes the suspension to "hard".
This is best for riding up hills.
Pressing the SOFT switch changes the suspension to "soft".
This is best for regular riding.
Shift timing adjustment dial
(2) If load on
legs feels light
Turn dial to the right