Abakhweli abaninzi abatsha abasanda kuthenga aibhayisekile yasezintabeniandiwazi umahluko phakathi kwe21-speed, 24-speed, and 27-speed.Okanye yazi nje ukuba i-21-speed yi-3X7, i-24-speed yi-3X8, kunye ne-27-speed yi-3X9.Kwakhona umntu wabuza ukuba i-24-speed mountain bike ikhawuleza kune-27-speed one.Enyanisweni, umlinganiselo wesantya unika abakhweli amathuba amaninzi okukhetha.Isantya sixhomekeke kumandla omlenze womkhweli, ukunyamezela kunye nobuchule.Ngethuba nje unamandla amakhulu, i-21-speed one ayicothi kune-24-speed bike!Zingaphi iimayile ezinokukhwela ibhayisekile yasezintabeni?
Kwithiyori, kwi-pedaling cadence efanayo, i-27-speed bike iya kuhamba ngokukhawuleza kune-24-speed one.Kodwa eneneni, ngomlinganiselo ophezulu wegiya, i-pedaling iya kuba nzima kakhulu, kwaye i-cadence iya kuncipha ngokwendalo.Ukuba i-cadence iyancipha, isantya siya kuncipha ngokwemvelo.Ngamanye amaxesha abanye abasaqalayo bathenga iibhayisekile zasezintabeni baze bathi, “Ibhayisekile yam ilungile, kutheni kunzima kangaka ukuyinyola?” Isizathu sikukuba akazange akhethe umlinganiselo wegiya omfaneleyo xa ekhwela.

Okokuqala makhe sijonge umahluko phakathi kwe21-speed, 24-speed and 27-speed:

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

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

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

Umlinganiselo wegiya linani leegiya ezahlulwe ngenani leendiza

21-isantya esiphezulu somlinganiselo wegiya 3.43, ubuncinci bomlinganiselo wegiya 1

24-isantya esiphezulu umlinganiselo wegiya 3.82, umlinganiselo ophantsi wegiya 0.73 (0.69)

27-isantya esiphezulu umlinganiselo wegiya 4, ubuncinane bomlinganiselo wegiya 0.73 (0.69)

Koku siyawubona umahluko phakathi kwazo.I-27-speed kunye ne-24-speed inomlinganiselo omkhulu okanye omncinci we gear kune-21-speed, enokukwenza ukuba ukhwele ngokukhawuleza kwaye uqhube umzamo omncinci.Ngenxa yokuba i-24-speed chainwheel ayifani ne-21-speed one, i-chainwheel encinci inokufumana umlinganiselo we gear elula, i-advanteji enkulu xa unyuka.I-24-speed bike inokufikelela kwi-transmission ratio ye-1.07 nokuba isebenzisa umlinganiselo we-2X1 wesantya.Ukuba i-flywheel yi-11 ~ 32, inokufikelela kwi-transmission ratio ye-1 (umlinganiselo omncinci wokuhanjiswa kwe-21-speed yi-1).Ngoko i-advanteji ngaphezu kwe-21-speed bike ye-24-speed one ayikho kuphela kwi-gear ekhawulezayo, kodwa ngakumbi kwi-gear ecothayo, eyenza kube lula kwaye ibe namandla ngakumbi kuwe ukukhwela kwiindlela zentaba.Umkhweli omtsha ucinga kuphela ukuba i-24-speed bike ikhawuleza kune-21-speed bike.Mhlawumbi bambalwa abantu abahlula inani lamazinyo ecrank nganye kunye nekhasethi ukubona ukuba yintoni umahluko.

Ngokuphathelele i-27-speed mountain bike, i-flywheel yayo ifana ne-24-speed one.Umahluko ngowokuba eyona crank inkulu ngaphambili ilungelelaniswe ukusuka ku-42 ukuya ku-44, ilungele abantu abanamandla ngokwasemzimbeni.Ibhayisikili yeentaba ze-24-speed okanye i-27-speed mountain bike umehluko phakathi kweendawo ezahlukeneyo zebhayisikili eziye zaphuculwa kwiimodeli ezingcono kunye nebakala layo.