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 what gears do you run?

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tzard
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PostSubject: Re: what gears do you run?   Thu Aug 14, 2008 8:36 pm

hahaha Jay promise wala talaga..hirap kasi ng panggabi

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zteg43
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PostSubject: Re: what gears do you run?   Sat Aug 16, 2008 7:24 pm

ito nakita ko lang sa OTN:

i created a way to calculate your gears while taking into consideration: gear ratio, crank length, and wheel size. i came up with this while trying to find out how my current gear on my mod would compare to my future gear on my stock. i wanted to know if it would effect my riding style at all.

Here's what you do:

1. devide the number of teeth on your front cog by the number of teeth in the rear to get your gear ratio.
*example: 18/12=1.5
2. multiply this by your wheel diameter in inches
*example: 1.5x20=30
3. multiply this number by pi. (this number is the aproximate distance you travel in one full pedal rotation.)
*example: 30xpi=94.2 (pi=3.141592654)
4. devide this number by your crank rotation circumferance (provided below)
*example: 94.2/39.08=2.41
-this number represents the ratio between how far you move your pedals
and how far your wheel moves. so if i crank my pedal 10 inches,
10x2.41=24.1 so i moved foreward 24 inches. cool huh?

crank rotation circumferances:
175mm cranks= 43.29 inches
170mm cranks= 42.05 in.
165mm cranks= 40.82 in.
158mm cranks= 39.08 in.
152mm cranks= 37.60 in. (monty x-alp cranks)

i just thought it would be cool to share this if anyone ever wanted or
ever will want to figure this out but couldn't. or maybe its just me...
but i did figure out that a mod with a 18/12 ratio and 158 mm cranks will have the same feel as a stock with a 18/15 ratio and 165 mm cranks... perfect.










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http://www.observedtrials.net/vb/showthread.php?t=8000&highlight=158mm+cranks+mod+gear

sana makatulong.

balik ako sa 12t sa rear ko. baka makatulong sa akin. hehe...
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zteg43
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PostSubject: Re: what gears do you run?   Sat Aug 16, 2008 7:31 pm

pero parang mabigat? galing na ako dun e. wahahaha!
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joolz
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PostSubject: Re: what gears do you run?   Sat Aug 16, 2008 11:04 pm

diko magets brads lashing kasi ako eh lakas tama hehehe

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tzard
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PostSubject: Re: what gears do you run?   Sun Aug 17, 2008 3:51 pm

HIRAP mATH hehehe

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raimun
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PostSubject: Re: what gears do you run?   Mon Aug 18, 2008 12:50 am

hmmm... yung dati kong gearing na 22-18 ang ratio is 2.37, tapos yung gamit ko ngayon na 22-21 ang ratio ay 2.03. 0.34 inches ang difference. parang maliit lang, no.

pero kung cocomputin yung 1.5 crank rotation ko (63 inches sa 170mm length)
149.31 inches ang 22-18 gearing at 127.89 inches naman sa 22-21. 21.42 inches ang difference. wah! ang laki! Sad
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zteg43
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PostSubject: Re: what gears do you run?   Mon Aug 18, 2008 4:28 pm

wehehe...pampagulo yan ng buhay. hahaha!
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patrick
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PostSubject: Re: what gears do you run?   Mon Aug 18, 2008 9:48 pm

Basta malaki ang epekto ng isang ipin at/o 5mm sa crank.
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benjo
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PostSubject: Re: what gears do you run?   Tue Aug 19, 2008 1:37 am

Hayup!! Sumasakit ulo ko sa mga compute-compute na yan!!
Eto nalang:
Kung ano gamit ng Marami + Kung saan ka comfortable = Good gear ratio... hehehe...
Diba!?!
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zteg43
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PostSubject: Re: what gears do you run?   Tue Aug 19, 2008 9:29 pm

hehe. ako kasi parang nalalambutan sa gear ko. minsan nabibigatan naman. ewan!
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tzard
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PostSubject: Re: what gears do you run?   Tue Aug 19, 2008 10:33 pm

hahaha nasanay ka kasi sa gearing ng pang jump bike...e di ba nga sabi mo, yung nasa parking lot tinitira mo...kaya magaan sa iyo ang gearing ng trials, pero kung nabibigatan ka, bro wag manigas ang hita pag naka rear wheel hehehe

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zteg43
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PostSubject: Re: what gears do you run?   Wed Aug 20, 2008 5:42 pm

wahahaha! oo nga e! lahat naninigas!!! pati si manoy!!! hahaha!!!
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tzard
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PostSubject: Re: what gears do you run?   Thu Aug 21, 2008 9:18 am

Hahaha baka nagagalit yan dahil sa mga naka post sa Off topic na crushes hehehe

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tzard
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PostSubject: Re: what gears do you run?   Thu Aug 21, 2008 9:42 am

raimun wrote:
hmmm... yung dati kong gearing na 22-18 ang ratio is 2.37, tapos yung gamit ko ngayon na 22-21 ang ratio ay 2.03. 0.34 inches ang difference. parang maliit lang, no.

pero kung cocomputin yung 1.5 crank rotation ko (63 inches sa 170mm length)
149.31 inches ang 22-18 gearing at 127.89 inches naman sa 22-21. 21.42 inches ang difference. wah! ang laki! Sad


Bro sa computation, ang layo ng naaabot mo..mga 30-35 grabe

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zteg43
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PostSubject: Re: what gears do you run?   Thu Aug 21, 2008 6:09 pm

malay ba natin dyan! hahaha! basta pansin ko, mas mabigat ang gear ratio, mas mahaba ang gap. nung naka 18/12 kasi ako, malayo take off ko para sa pedal up. at kahit umaandar, ako, ok lang. sa 18/15, medyo malapit ako sa aakyatin ko. di rin pwede kung mabilis ang andar, kasidi kumakagat ang gear, ampaw... dapat magbagal o full stop.

pero, lahat nasa timing at practice parin magtatapos...hehe...

18/14 siguro, ok na yun sa akin. try ko pag sinipag ako mag kalikot. di ko kasi makumpara sa gears nyo. ako lang kasi ang naka 158mm na crank arm e.
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patrick
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PostSubject: Re: what gears do you run?   Thu Aug 21, 2008 11:56 pm

Napansin ko pre sa home schooled mataas ang ratio o high speed, ang properly schooled mababa ang gearing pero mataas ang lundag. Tulad nina TRA, Kenny etc.
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zteg43
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PostSubject: Re: what gears do you run?   Fri Aug 22, 2008 12:27 pm

ganun ba? pero bakit sa otn, halos lahat ay 18:12 ang sinasabi kapag mod?
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tzard
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PostSubject: Re: what gears do you run?   Fri Aug 22, 2008 2:03 pm

dapat mag aral tayo lumundag whaever gearing we have

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PostSubject: Re: what gears do you run?   Fri Aug 22, 2008 4:52 pm

o nga. timing at praktis... yun lang talaga.
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tzard
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PostSubject: Re: what gears do you run?   Sat Aug 23, 2008 8:51 am

ako walang praktiz kaya walang timing hehehe

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PostSubject: Re: what gears do you run?   Sat Aug 23, 2008 12:36 pm

Hindi ko kabisado ang sa Mod Dyani pero ang usapan sa stock 18:16 sa mga batikan.Hindi nila nirerekomenda ang mataas pwera sa diskarte ni Vince na 18:15x175mm ata, may makaka confirm ba nito?
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PostSubject: Re: what gears do you run?   Sat Aug 23, 2008 3:51 pm

yun nga. kasi kung iisipin, logically,

26"+165mm+18:15 = 20"+158mm+18:12

compensated ang gear ratio sa wheel size at arm length.

kahit na iba ang kakalabasan sa equation na front cog divided by rear cog, halos pareho lang ang feel dahil sa distribution ng ratios at proportions sa crank arm at wheel size.

mas mahaba ang arm, mas gumagaan ang feel kahit pareho lang ang gamit na gear ratios.
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PostSubject: Re: what gears do you run?   Sun Aug 24, 2008 12:47 am

ang hirap ispelengin nitong gear ratio na ito wehehehehe

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PostSubject: Re: what gears do you run?   Sun Aug 24, 2008 11:05 am

Dyani yung computation mo mabigat ang gearing na yan pang stock para sa akin. Although sanay ako sa low gearing kasi habol ko all around advantage ay masasanay ako na sakto lang ang bira sa drivetrain.
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PostSubject: Re: what gears do you run?   Sun Aug 24, 2008 3:27 pm

mabigat nga. anyway, malalaki silang tao. kaya magaan para sa kanila yun. hahaha!!! though, nakuha ko yung mod ko, yun na ang set up. taga hk naman ang may-ari....
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