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Post by puregutz on Dec 27, 2006 22:35:44 GMT 8
try 172.5mm crank for ur height! wahahaha! EVS! |
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Post by <eVs10nacious< on Dec 28, 2006 9:44:40 GMT 8
178mm n nga lng!  EVS!  |
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Post by wadesingson on Dec 29, 2006 15:36:39 GMT 8
 dont use 175mm specially if you ride tagaytay at speed you might hit the rock garden daw PAGING PEAK3 where are you? |
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Post by pjax on Dec 29, 2006 23:11:20 GMT 8
i think he's strictly talking about "gear ratios". true that the leverage/mechanical advantage would change, but the gear ratios are the same think about it. say you have a 32x18 singlespeeder with 175mm cranks. that's a 32:18 gear ratio. then you swapped it with 170mm cranks. did the gear ratio change? no, it's still 32:18. although you have less leverage/mechanical advantage gear ratio is not affected by the length of the crank arms. that's why it's called gear ratio... just the gears. Oh yes they do. 2:1 will not feel the same with different length of cranks because they are not the same setup. The shorter the crank the more power you need to drive the same gear ratio. Lesser mechanical advantage. Same with tire diameter. Same gear ratio will not feel the same. You now lost 5 mm of leverage. |
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Post by Patrick on Dec 29, 2006 23:55:52 GMT 8
You sir will become a good lawyer someday... ;D fortunately im an engineer that doesnt speak well.
From my original post I meant that with the changing of crank arm length you will need to change gear ratios as well.
I didnt mean that they will be affected by the crank arm IE 32:16 will be different. I mean that they will affect how you use them. Dont take it literally.
My observation is based loosely also on trials background wherein a 170mm crank uses a diferent combination (gear ratios) than a 175mm crank to obtain the same torque, wherein changes are done using fractions in ratios.
Because precisely they will remain just that: gear ratios, when you change your leverage they will be left behind because, both of you are correct they remain the same just like what I meant. 32:16 before is the same now 32:16 but a lot heavier feel, so they are affected. Thats why you need to change your gear ratios . [ I didnt mean that but some miracle 32:16 (the ratio) which is equal to 2:1 will be not be equal anymore.]
Imaginary example lang, with hypothetical solution so I wont be misinterpreted:
With the new shorter crank your torque on a 32:16 will now be matched by a 32:17.
Get it? (I think you already did) ;D anyway for the others
You say 32:16 = 32:16, I say 175:32:16 <> 170:32:16,
Change to shorter crank arm,
gear ratio become heavy,
cadence change, rider hingal etc
need change gear ratio.
Kuha nyo? Anyway you will get used to it, some of you guys wouldnt even notice...;D
BTW this happened to a friend of mine whom I swaped my shinny XT casette 11T-34T to his crappy brand spider 11T-32T hmm SRAM ba yon? ;D because I needed his 18T from my 20T.
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Post by Poseur on Jan 11, 2007 21:48:57 GMT 8
i'm getting a headache. go with your height and the type of bike you're installing this on.
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Post by Patrick on Jan 11, 2007 22:28:52 GMT 8
too much pedalling ;D hehe
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Post by Poseur on Jan 13, 2007 14:34:36 GMT 8
^^ right! screw the pedalling part. it's meant as a foot peg. ;D
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Post by miles on Jun 5, 2007 15:40:00 GMT 8
im using 172.5 on my road, 170 on my FS and 175 on my HT, cant say if the difference is in the crankarm length or the weight of the bike 18lbs-road 24lbs-HT 48lbs-FS hehe
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Ka Verong
Free Rider
We only but have one world, preserve it... conserve it.. save it...
Posts: 383
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Post by Ka Verong on Jun 21, 2007 13:44:50 GMT 8
ang tatangkad nyo... (trans. you little giants) No one is using or is even comfortable with 165mm? | Leg Length | Crank Length | | 60 to 65cm | 150mm | | 66 to 70cm | 155mm | | 72 to 75cm | 160mm | | 75 to 78cm | 162.5mm | | 79 to 81cm | 165mm | | 82 to 83cm | 167.5mm | | 83 to 86cm | 170mm to 172.5mm | | 87 to 90cm | 175mm to 177.5mm | | 91 to 94cm | 180mm | | 94cm plus | 185mm |
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Post by >rocketman> on Jun 21, 2007 17:20:10 GMT 8
Im 5'11 near 6 ft I use 165s holzfeller crank arm on my ih sunday (bb ht is low)
and im comfortable with it.
evsjonga who is also tall use 165s race face on hi santa cruz V10.
to each his own,
its your bike and
it's you who will decide what crank arm length to use,
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Post by knobbyist on Jun 25, 2007 13:36:31 GMT 8
your height has a lot to do with your choice of crank arm length. but pedaling style is also a factor. if your a masher... 175 would be a good choice but if your a spinner... then 170 is the one. peace out!
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Ka Verong
Free Rider
We only but have one world, preserve it... conserve it.. save it...
Posts: 383
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Post by Ka Verong on Jun 25, 2007 15:36:23 GMT 8
I've read this many times... but I guess, this is more applicable to roadies. I'm 5'7" & I have 165, 170, & 175mm cranks depending on bike setup. for my XCs I have both 170 & 175mm. the 170 I prefer for touring while 175 for lotsa climbs. on my DH/FR I have 165mm, cause there's not much effort in pedaling downhill & its easier to spin high RPMs. your height has a lot to do with your choice of crank arm length. but pedaling style is also a factor. if your a masher... 175 would be a good choice but if your a spinner... then 170 is the one. peace out! |
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Post by jamen on Jun 28, 2007 11:44:25 GMT 8
i think height has nothing to do with the length of the cranks arms. you can always adjust your seatpost to have a good fit vertically. 170mm cranks are for fast spinners, caters usually for road bikers. now, if you want to decrease bouncing and optimize speed on rocky off-road trails, you may want to consider the longer and slower 175mm crank. |
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Post by Ben Dover on Jun 28, 2007 11:56:16 GMT 8
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Ka Verong
Free Rider
We only but have one world, preserve it... conserve it.. save it...
Posts: 383
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Post by Ka Verong on Jun 28, 2007 14:36:58 GMT 8
I think that'll work for people with polio. |
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berns
XC Rider
He who does only what is ask is a slave but he who does more is a free man
Posts: 113
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Post by berns on Jun 28, 2007 21:38:50 GMT 8
The longer the better!
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Post by glockbiker on Jul 13, 2007 11:53:00 GMT 8
In the US, most singlespeeders prefer 180mm cranks for maximum leverage. Gary Kemp, an SS rider who works at SDG (saddles) and is the president of OCOG (Orange Country One Gear) summed it up by saying: "LONGER IS DEFINTELY BETTER!".
I can assure you he was talking about crankarms and not about the male anatomy.
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Post by Alphabolt on Jul 14, 2007 12:05:40 GMT 8
In the US, most singlespeeders prefer 180mm cranks for maximum leverage. Gary Kemp, an SS rider who works at SDG (saddles) and is the president of OCOG (Orange Country One Gear) summed it up by saying: "LONGER IS DEFINTELY BETTER!". I can assure you he was talking about crankarms and not about the male anatomy. he can be talking about both ...It applies to both:) The shorter it is the more active you have to make it : perform  heheh |
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dont use 175mm specially if you ride tagaytay at speed you might hit the rock garden daw 
