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 Gear Ratio

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Abe
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PostSubject: Gear Ratio   Sat Jan 09, 2010 12:53 pm

Guys, meron akong ginawa formula para ma-compute ang gear ratio ratio base sa gearing relations at wheel size and crank arm length. Hope this helps.
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zteg43
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PostSubject: Re: Gear Ratio   Sat Jan 09, 2010 7:20 pm

what the pak?!!!!!

ito ang adik! gumawa pa ng sariling equation!

paano to ser? gamit ko now is 170mm arm, 18tffw, 12t cog? nabibigatan kasi ako sa 158mm x 18t x 12t... i used a longer arm for leverage.

ok kaya ang 170mm x 18t x 15t, sa mod???

it seems na ganun halos ang gamit nila joelou at jervy.
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zteg43
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PostSubject: Re: Gear Ratio   Sat Jan 09, 2010 7:35 pm

teka ser. walang 19 na wheel. considered as 20 parin yun. 19 lang ang rims, pero dahil sa 2.5 ang gulong, pag may hangin na yun, ang outer diameter ay 20 na rin. 19 lang ang inner diameter ng tire para ma-compensate ang pagiging 2.5 nya and being 20 at the same time.
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patrick
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PostSubject: Re: Gear Ratio   Sat Jan 09, 2010 9:40 pm

Ayuz
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joolz
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PostSubject: Re: Gear Ratio   Sat Jan 09, 2010 10:20 pm

ako naman pa compute:

sa stock ko: 16-14

kay jeprox: 22-21

hehehe

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Abe
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PostSubject: Re: Gear Ratio   Sat Jan 09, 2010 11:32 pm

zteg43 wrote:
what the pak?!!!!!

ito ang adik! gumawa pa ng sariling equation!

paano to ser? gamit ko now is 170mm arm, 18tffw, 12t cog? nabibigatan kasi ako sa 158mm x 18t x 12t... i used a longer arm for leverage.

ok kaya ang 170mm x 18t x 15t, sa mod???

it seems na ganun halos ang gamit nila joelou at jervy.

@ Dyani:
* sa 170mm x 18t(front) x 15t (rear) x 20" = 1.793 (mukang masyadong magaan)
* sa 170mm x 18t(front) x 12t (rear) x 20" = 2.241 (looks ideal, testingin natin bukas kung totoo yung nasa formula)
* sa 158mm x 18t(front) x 12t (rear) x 20" = 2.411 (mabigat nga, kaya pala sumasakit likod ko tuwing ginagamit ko Monty ko, pwersado)
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Abe
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PostSubject: Re: Gear Ratio   Sat Jan 09, 2010 11:40 pm

joolz wrote:
ako naman pa compute:

sa stock ko: 16-14

kay jeprox: 22-21

hehehe

@ Joolz
* sa 175mm x 16t(front) x 14t (rear) x 26" = 2.156 (mukang ok)
* sa 170mm x 16t(front) x 14t (rear) x 26" = 2.22 (mas mukang ok)

* sa 175mm x 22t(front) x 21t (rear) x 26" = 1.976 (mukang masyadong magaan)
* sa 170mm x 22t(front) x 21t (rear) x 26" = 2.035 (mukang ok)
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Abe
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PostSubject: Re: Gear Ratio   Sat Jan 09, 2010 11:54 pm

Pero napansin ko lang, may mga iba pang factors na nakaka-apekto sa feel ng gearing tulad ng:
1. Chainstay length ( like, its easier to balance kung shorter ang CS)
2. length ng stem and height ng bars (mas madaling hatakin kung mataas ang bars)
3. length ng bike (hirap hatakin pag masyado mahaba ang wheel base)
4. height ng rider ( mas madali para sa matatangkad na riders gumamit ng ibat-ibang sizes ng trial bikes dahil madali nila maadjust yung balance point dahil nga mahahaba ang mga braso nila at binti)
.....so ibig sabihin, riders preference pa rin ang gearing...
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davidoff
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PostSubject: Re: Gear Ratio   Sun Jan 10, 2010 5:51 am

Ayos abe! hehehe
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patrick
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PostSubject: Re: Gear Ratio   Sun Jan 10, 2010 6:32 am

Ni compute ko yung 170x18x16 ko panag equal lang pala sa 175x22x19 ko as in halos equal pero bakit parang ang luwag nung 18-16 ko? Baka nasanay na ako sa luwag hehe
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zteg43
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PostSubject: Re: Gear Ratio   Sun Jan 10, 2010 6:53 pm

ah... sige try ko naman 158mm x 18t x 15t. baka ok...
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zteg43
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PostSubject: Re: Gear Ratio   Wed Jan 13, 2010 11:27 pm

di ko makuha ito... paano ulit? hahaha!

what if 158mm x 18x 15 x 20???
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benjo
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PostSubject: Re: Gear Ratio   Thu Jan 14, 2010 4:38 pm

hanep toh abe!!
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Abe
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PostSubject: Re: Gear Ratio   Fri Jan 15, 2010 10:54 pm

@ Dyani:
158mm x 18x 15 x 20 = 1.929 (masyado magaan),
mas mukang ok yung 158mm x 18x 13 x 20 = 2.226

@ Benjo:
Musta na ser, may bike na ba u? Thank you nga pala sa pads na bigay mo dati.
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zteg43
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PostSubject: Re: Gear Ratio   Sat Jan 16, 2010 12:39 am

yung gamit ni ian, 165mm x 18t x 14t x 20...

baka macompensate ang length ng arm. hehehe...
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