Abagibeli abaningi abasha abasanda kuthenga aibhayisikili lezintabaangiwazi umehluko phakathi kwe-21-speed, 24-speed, kanye ne-27-speed.Noma yazini ukuthi ama-21-speed yi-3X7, ama-24-speed yi-3X8, kanti ama-27-speed yi-3X9.Futhi othile ubuze ukuthi ibhayisikili lezintaba elinamagiya angu-24 liyashesha yini kunelejubane elingu-27.Eqinisweni, isilinganiso sejubane sinikeza abagibeli amathuba amaningi okukhetha.Ijubane lincike emandleni omlenze womgibeli, ukukhuthazela namakhono.Uma nje unamandla amakhulu, i-21-speed ayinensa kunebhayisikili lama-24-speed!Mangakhi amamayela ongawagibela ibhayisikili lezintaba?
Ngokombono, endaweni efanayo yokugibela ibhayisikili, ibhayisikili elinamajubane angu-27 lizogijima ngokushesha kunelejubane elingu-24.Kodwa empeleni, ngesilinganiso segiya eliphezulu, ukunyathela kuzoba nzima kakhulu, futhi i-cadence izokwehla ngokwemvelo.Uma i-cadence iyancipha, isivinini sizokwehla ngokwemvelo.Kwesinye isikhathi abanye abasaqalayo bathenga amabhayisikili asezintabeni bese bethi, “Ibhayisikili lami lihle, kungani kunzima kangaka ukulishaya?” Isizathu siwukuthi akazange akhethe isilinganiso segiya elimfanelayo lapho egibele.

Okokuqala ake sibheke umehluko phakathi kwe-21-speed, 24-speed kanye ne-27-speed:

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)

Isilinganiso segiya yinani lamagiya ahlukaniswe ngenani lama-flywheels

21-isivinini esiphezulu segiya isilinganiso 3.43, ubuncane begiya isilinganiso 1

24-speed esiphezulu segiya isilinganiso 3.82, ubuncane begiya isilinganiso 0.73 (0.69)

27-speed esiphezulu segiya isilinganiso 4, ubuncane begiya isilinganiso 0.73 (0.69)

Kulokhu siyawubona umehluko phakathi kwabo.Amagiya angu-27 namagiya angu-24 anegiya elikhudlwana noma elincane kune-21-speed, elingakwenza ukuthi ugibele ngokushesha futhi likwenze ungabi namandla okugibela.Ngenxa yokuthi i-24-speed chainwheel ayifani ne-21-speed one, isondo elincane le-chain lingathola i-lighter gear ratio, okuwusizo olukhulu uma ukhuphuka.Ibhayisikili elinamagiya angu-24 lingakwazi ukufinyelela isilinganiso sokudlulisela esingu-1.07 noma lisebenzisa isilinganiso sejubane esingu-2X1.Uma i-flywheel ingu-11~32, ingakwazi ukufinyelela isilinganiso sokudlulisela esingu-1 (isilinganiso esincane sokudlulisela esingu-21-speed singu-1).Ngakho-ke inzuzo ngaphezu kwebhayisikili elingu-21-speed elilodwa alikho egiyeni elisheshayo kuphela, kodwa lingaphezulu egiyeni elihamba kancane, okwenza kube lula futhi kube namandla ngawe ukugibela emigwaqweni yasezintabeni.Umgibeli omusha ucabanga kuphela ukuthi ibhayisikili elinamagiya angu-24 liyashesha kunebhayisikili elinamajubane angu-21.Mhlawumbe bambalwa abantu abahlukanisa inani lamazinyo e-crank ngayinye nekhasethi ukuze babone ukuthi uyini umehluko.

Mayelana nebhayisikili lezintaba elinamagiya angu-27, i-flywheel yalo ivamise ukufana nele-24-speed.Umehluko wukuthi i-crank enkulu yangaphambili ilungiswa isuka ku-42 iye ku-44, elungele abantu abanamandla amahle.Ibhayisikili lezintaba ezingama-24-speed noma ibhayisikili lezintaba ezingu-27-speed umehluko phakathi kwezingxenye ezihlukahlukene zebhayisikili ezithuthukisiwe zaba onobuhle abangcono ngebanga lalo.