Thumb Shifters; Below The Bar Shifters - Dynacraft SINGLE SPEED Owner's Manual

Thumb Shifters (Top Mounted)
Left hand lever Right hand lever
Many mountain style bicycles are equipped with shifters
mounted on the top of the handlebars and operated by
the thumbs. To select a lower, easier gear, shift to a bigger
rear cog and a small chainwheel. Pull the left shifter back
to operate the rear derailleur. To select a higher, harder
gear, shift to a smaller rear cog and a larger chainwheel.
Push the left shifter forward for the front, and pull the right
lever back for the rear.
Bottom Gear
Top Gear
(Easier)
(Harder)
Large rear sprocket
Small rear sprocket
Small chainwheel
Large chainwheel
Left hand lever back
Left hand lever forward
Right hand lever forward
Right hand lever back

Below the Bar Shifters

Many mountain style bicycles now use a shift lever
Left hand lever Right hand lever
arrangement mounted on the underside of the handlebars,
which use two levers operated by the thumb and index
finger. To select a lower gear, push the larger (lower) right
shifter with your thumb to engage a larger rear cog. One
firm push shifts the chain one cog, continuing to push will
move the chain over multiple cogs. Pulling the smaller
(upper) right lever with your index finger to engage a
smaller rear cog. Pushing the larger (lower) left lever with
your thumb will move the chain from a smaller to a
larger chainwheel.
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BEFORE YOU RIDE