Okwera magalimoto ambiri atsopano omwe angogula kumenenjinga yamapiriSindikudziwa kusiyana pakati pa liwiro la 21-speed, 24-speed, ndi 27-speed. Kapena ingodziwani kuti liwiro la 21-speed ndi 3X7, liwiro la 24 ndi 3X8, ndipo liwiro la 27 ndi 3X9. Winawake anafunsanso ngati njinga yamapiri ya 24-speed ndi yachangu kuposa ya 27-speed. Ndipotu, chiŵerengero cha liwiro chimangopatsa okwera mwayi wosankha. Liwiro limadalira mphamvu ya mwendo wa wokwerayo, kupirira kwake ndi luso lake. Malinga ngati muli ndi mphamvu zambiri, ya 21-speed si yocheperapo kuposa njinga ya 24-speed! Kodi njinga yamapiri ingakwere makilomita angati?
Mwachidule, pa cadence yomweyi ya pedaling, njinga ya 27-speed imayenda mofulumira kuposa njinga ya 24-speed. Koma kwenikweni, ndi giya yokwera, pedaling idzakhala yolemera kwambiri, ndipo cadence idzachepa mwachibadwa. Ngati cadence ichepa, liwiro lidzachepa mwachibadwa. Nthawi zina oyamba kumene ena amagula njinga zamapiri nati, “Njinga yanga ndi yabwino, n’chifukwa chiyani zimakhala zovuta kuiyendetsa?” Chifukwa chake n’chakuti sanasankhe giya yomwe ikugwirizana naye akakwera.

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

Chingwe cha unyolo ndi crank cha liwiro la 21 48-38-28 chingwe cha unyolo 14~ 28

Chingwe cha unyolo ndi crank cha liwiro la 24 42-32-22 chingwe cha unyolo 11~ 30(11~ 32)

Chingwe cha unyolo ndi crank cha liwiro la 27 44-32-22 chingwe cha unyolo 11~ 30(11~ 32)

Chiŵerengero cha magiya ndi chiwerengero cha magiya ogawidwa ndi chiwerengero cha mawilo owuluka

Chiŵerengero chachikulu cha magiya a liwiro la 21 ndi 3.43, chiŵerengero chochepa cha magiya ndi 1

Chiŵerengero chachikulu cha magiya a liwiro 24 ndi 3.82, chiŵerengero chochepa cha magiya ndi 0.73 (0.69)

Chiŵerengero chachikulu cha magiya othamanga 27 4, chiŵerengero chochepa cha magiya othamanga 0.73 (0.69)

Kuchokera pamenepa tikutha kuona kusiyana pakati pawo. Magiya a 27-speed ndi 24-speed ali ndi chiŵerengero chachikulu kapena chaching'ono cha giya kuposa 21-speed, chomwe chingakupangitseni kukwera mofulumira ndikukupangitsani kukwera pang'ono. Chifukwa gudumu la 24-speed silofanana ndi gudumu la 21-speed, gudumu laling'ono la tcheni likhoza kupeza chiŵerengero cha giya chopepuka, chomwe ndi phindu lalikulu pokwera. Njinga ya 24-speed imatha kupeza chiŵerengero cha kufalikira kwa 1.07 ngakhale itakhala ndi chiŵerengero cha liwiro la 2X1. Ngati gudumu louluka ndi 11 ~ 32, imatha kupeza chiŵerengero cha kufalikira kwa 1 (chiŵerengero chochepa cha kufalikira kwa 21-speed ndi 1). Chifukwa chake ubwino kuposa njinga ya 21-speed ya 24-speed sikutanthauza giya yothamanga kwambiri yokha, komanso kwambiri mu giya yochedwa kwambiri, zomwe zimapangitsa kuti zikhale zosavuta komanso zamphamvu kwambiri kuti mukwere m'misewu yamapiri. Wokwera watsopano amangoganiza kuti njinga ya 24-speed ndi yachangu kuposa njinga ya 21-speed. Mwina anthu ochepa okha ndi omwe amagawanitsa mano a crank ndi kaseti iliyonse kuti aone kusiyana kwake.

Ponena za njinga yamoto ya mapiri ya liwiro la 27, gudumu lake lozungulira nthawi zambiri limakhala lofanana ndi la 24-speed. Kusiyana kwake ndikuti crank yayikulu yakutsogolo imasinthidwa kuchoka pa 42 mpaka 44, yomwe ndi yoyenera anthu omwe ali ndi mphamvu zabwino. Njinga yamoto yamapiri ya liwiro la 24 kapena njinga yamapiri ya liwiro la 27 ndi kusiyana pakati pa magawo osiyanasiyana a njinga yomwe yasinthidwa kukhala mitundu yabwino kwambiri yokhala ndi mtundu wake.