ChainlineIDouble
TripleChainline
自行车链条线设计参数
Chainline
ThisreferstohowstraightthechainrunsbetweenthefrontandrearsprocTriplelongerdimensionmaybeneeded,becausethefattubeplacesmm
thederailermechanismfarthertotheright.
Track/Coaster
-42thisrangeOne-SpeedmmNewerbikeswith120mmspacingnormallyuse42mmMostinternal
gearhubs
Rohloff54mmThisisclosetothechainlineoftheouterring
Speedhub(58mmofatypicalMTBtriple
w/13
tooth)
WhiteIndustriesENOhubsusethischainline,'salsofairlyclosetotheouterpositionofatypical"road"Alternatedouble.
ChainlineMeasurement-Front
Chainlineismeasuredfromthecenterlineoftheframetothecenterofthechain.
Youcanmeasurethefrontchainlinedirectlywithasimpleruler.
,,measuretothehalfwaypointbetweenthetworings.
ChainlineAdjustment-Front
Ifyouneedtoadjustthefrontchainline,thereareseveraldifferent
optionstoaccomplishit:
,ChangetheBottomBracket
Mostbottombracketsmadesincethemid-'90saresymmetrical,theystickoutthesame
,say,4
mmshorter,itwillmovethechainline2mmtotheleft,becauseitwillbe2mmshorter
oneachside.
Ifyougothisroutetoanarrowerchainline,makesurethattherewon'tbeaclearanceproblembetweentheframeandthecrankorchainring.
,BottomBracketSpacer
Ifyouneedtoincreasethechainline(movethechainringtotheright)youcanusually
addaspacerwasherbetweentheright-sidebottombracketmountingring(orcup)and
Sturmey-
,Idon't
knowofanysourceforaspacerthatwillfitanItalian(36mm)bottombracket.,
Ch
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