Currie tech IZIP - Below the Bar Shifters

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Manymountainstylebicyclesnowuseashift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)leftshifterwith
your index finger moves the chain from a larger to a smaller chainwheel.
To select a higher gear pull 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.Pleaserefertopages114-115foradditionalinstructionsin
“How Things Work”.
Lefthandlever  Righthandlever