Drivetrain - Giant Momentum User Manual

4.5 DRIVETRAIN

Some e-bike models come equipped with an
internal gear hub. Most models have an automatic
chain-tensioner that maintains proper chain
tension, similar to bikes with a rear derailleur.
On models without an automatic chain tensioner,
the chain tension must be checked and adjusted
manually.
Adjustmens should only be performed with
proper tools by a trained mechanic. Ask
your local Giant dealer for more information and
support on your e-bike's technical maintenance.
How to check the chain tension
To check the chain tension, hold the chain in
the middle section between the front and rear
sprockets.
∙ Move the chain up and down to check the
slack on the chain.
∙ There should be between 10-15mm of vertical
movement.
∙ If the movement is more or less, the chain
tension needs to be adjusted.
How to adjust the chain tension
Some models have horizontal drop-outs, others
may have sliding rear drop-outs and chain tension
adjustment screws. To adjust the chain tension,
the rear wheel or sliding dropout should be
released in to allow for horizontal movement of
the rear axle and sprocket.
∙ Release the axle nuts, or sliding dropout bolts
if applicable.
∙ Move the rear wheel backward or forward by
hand or by turning the adjustment screws to
achieve the proper chain tension.
∙ Fix the rear wheel in place by tightening the
axle nuts or dropout bolts.
∙ Always make sure the rear wheel is centred in
the frame.
Belt Drive
Read the belt drive manufacturer's operating
instructions provided with the e-bike for technical
specifications and requirements.
All models with belt drive have sliding rear drop-
outs and tension adjustment screws to adjust the
belt tension. The adjustment procedure for a belt
drive is the same as for a chain.
22
10-15mm