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Somespecialhigh-performancetireshaveunidirectionaltreads:theirtreadpatternisdesignedtoworkbetterinonedirection
thanintheother.Thesidewallmarkingofaunidirectionaltirewillhaveanarrowshowingthecorrectrotationdirection.Ifyour
bike has unidirectional tires, be sure that they are mounted to rotate in the correct direction.
The tire valve allows air to enter the tire’s inner tube under pressure, but doesn’t let it back out unless you want it to. There are
primarilytwokindsofbicycletubevalves:TheSchraederValveandthePrestaValve.Thebicyclepumpyouusemusthavethe
fittingappropriatetothevalvestemsonyourbicycle.AlleZipandiZipbicyclesuseSchraedervalves
TheSchraederislikethevalveonacartire.ToinflateaSchraedervalvetube,removethevalvecapandpushtheairhoseor
pumpfittingontotheendofthevalvestem.ToletairoutofaSchraedervalve,depressthepinintheendofthevalvestemwith
the end of a key or other appropriate object.
ThePrestavalvehasanarrowerdiameterandisonlyfoundonbicycletires.ToinflateaPrestavalvetubeusingaPresta
headed bicycle pump, remove the valve cap; unscrew (counterclockwise) the valve stem lock nut; and push down on the valve
stemtofreeitup.Thenpushthepumpheadontothevalvehead,andinflate.ToinflateaPrestavalvewithagasstationair
hose,you’llneedaPrestaadapter(availableatyourbikeshop)whichscrewsontothevalvestemonceyou’vefreedupthe
valve.Theadapterfitstheendoftheairhosefitting.Closethevalveafterinflation.ToletairoutofaPrestavalve,openupthe
valve stem lock nut and depress the valve stem.
Somebicyclescomeequippedwithsuspensionsystemswhicharedesignedtosmoothoutsomeoftheshocksencountered
whileriding.Therearemanydifferenttypesofsuspensionsystems—toomanytodealwithindividuallyinthismanual.Ifyour
bicycle has a suspension system of any kind, consult a qualified specialist to provide you with the appropriate adjustment and
maintenance instructions.
Failuretomaintain,checkandproperlyadjustthesuspensionsystemmayresultinsuspensionmalfunction,
which may cause you to lose control and fall.
Changingsuspensionadjustmentcanchangethehandlingandbrakingcharacteristicsofyourbicycle.Never
change suspension adjustment unless you are thoroughly familiar with the suspension system manufacturer’s instructions
and recommendations, and always check for changes in the handling and braking characteristics of the bicycle after a
suspension adjustment by taking a careful test ride in a hazard-free area.
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