,bothsprocketsshouldbeinthesameplane,"perfectchainline".Inthecaseofderailergearedbicycles,,theworsethemechanicalefficientyofthedrivetrain."Correct"chainlineforaderailersystemisamatterofopinion,"simple"answerstothequestionofwhatconstitutesproperchainline:Oneviewisthatthemiddleoftheclustershouldlineupwiththemiddlechainring(orhalf-waybetweenthetwo,'pointofview,,obefarthertotherightalso,becausetheirmainpriorityisshiftingperformance,'spointofview,,consideraroadtriplevsamountainbiketriple:Witharoadtriple,youmostlyusethetwobiggerrings,asionallyused,,havingthecranksclose-inisgood,,thesmallringisusedmuchmoreoften,,:,,thisputstheinnerat41mm,,-50mmShimanospec,,butforframeswithoversizedseattubes,thelongerdimensionmaybeneeded,--42mmOlde
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