Cannondale Synapse Carbon Owner's Manual page 64

PaRt ii
shiftinG GeaRs While PedalinG
CaUtion
Shifting under extreme pedaling pressure puts
a great amount of stress on components. While
most components can withstand an occasional
"power shift, " continual power shifting will most
assuredly damage some part of your drivetrain.
Whenever possible, ease up on your pedals
when shifting.
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