Okwera ambiri atsopano omwe angogula anjinga yamapirisindikudziwa kusiyana pakati pa 21-liwiro, 24-liwiro, ndi 27-liwiro.Kapena dziwani kuti 21-liwiro ndi 3X7, 24-liwiro ndi 3X8, ndi 27-liwiro ndi 3X9.Komanso wina adafunsa ngati njinga yamapiri ya 24-speed ndi liwiro kuposa 27-liwiro.M'malo mwake, kuchuluka kwa liwiro kumangopatsa okwera mwayi wosankha.Kuthamanga kumadalira mphamvu ya mwendo wa wokwerayo, kupirira ndi luso.Malingana ngati muli ndi mphamvu zazikulu, 21-speed imodzi sichedwa kuposa 24-speed bike!Kodi njinga yamapiri ingakwere mailosi angati?
Mwachidziwitso, pamtunda womwewo, njinga ya 27-speed idzathamanga kuposa 24-liwiro.Koma kwenikweni, ndi chiŵerengero cha magiya apamwamba, kupondaponda kumakhala kolemera kwambiri, ndipo cadence idzachepa mwachibadwa.Ngati cadence ichepa, liwiro lidzachepa mwachibadwa.Nthawi zina ena ongoyamba kumene amagula njinga za m’mapiri n’kunena kuti, “Njinga yanga ndiyabwino, n’chifukwa chiyani ndi yovuta kuiponda?” Chifukwa chake n’chakuti sanasankhe magiya oyenerera akamakwera.

Choyamba tiyeni tiwone kusiyana pakati pa 21-liwiro, 24-liwiro ndi 27-liwiro:

21-speed chainwheel & crank 48-38-28 flywheel 14 ~ 28

24-speed chainwheel & crank 42-32-22 flywheel 11 ~ 30 (11~ 32)

27-speed chainwheel & crank 44-32-22 flywheel 11 ~ 30 (11~ 32)

Chiŵerengero cha gear ndi chiwerengero cha magiya omwe amagawidwa ndi chiwerengero cha ma flywheels

21-speed maximum gear ratio 3.43, chiwerengero chochepa cha gear 1

24-speed maximum gear ratio 3.82, osachepera 0.73 (0.69)

27-speed maximum gear ratio 4, osachepera giya chiŵerengero 0.73 (0.69)

Kuchokera apa tikutha kuona kusiyana pakati pawo.Ma 27-liwiro ndi 24-liwiro ali ndi zida zazikulu kapena zazing'ono kuposa 21-liwiro, zomwe zingakupangitseni kukwera mwachangu ndikupangitsa kuti musamavutike kwambiri.Chifukwa gudumu la 24-speed chain wheel silofanana ndi 21-liwiro, tcheni chaching'onocho chimatha kupeza giya yopepuka, yomwe ndi mwayi waukulu pokwera.Njinga ya 24-speed imatha kukwaniritsa chiŵerengero cha kufala kwa 1.07 ngakhale imagwiritsa ntchito liwiro la 2X1.Ngati flywheel ndi 11 ~ 32, ikhoza kukwaniritsa chiŵerengero chotumizira 1 (chiŵerengero chocheperako cha 21-liwiro ndi 1).Kotero ubwino pa njinga ya 21-speed 24-speed imodzi sikuti mumangoyenda mofulumira kwambiri, koma mukuyenda pang'onopang'ono, zomwe zimapangitsa kuti zikhale zosavuta komanso zamphamvu kuti muyende pamisewu yamapiri.Wokwera watsopano amangoganiza kuti njinga ya 24-speed ndi yothamanga kuposa 21-speed bike.Mwina anthu ochepa amagawaniza chiwerengero cha mano pa crank iliyonse ndi kaseti kuti awone kusiyana kwake.

Ponena za njinga yamapiri 27-speed, flywheel yake nthawi zambiri imakhala yofanana ndi 24-liwiro.Kusiyana kwake ndikuti crank yayikulu yakutsogolo imasinthidwa kuchokera ku 42 mpaka 44, yomwe ili yoyenera kwa anthu omwe ali ndi mphamvu zabwino.Bicycle yamapiri a 24-speed kapena 27-speed phiri bike ndi kusiyana pakati pa mbali zosiyanasiyana za njinga zomwe zasinthidwa kukhala zitsanzo zabwino ndi kalasi yake.