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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 06-13-07, 08:05 AM   #1
krucial
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anyone run < 160mm cranks?

I am entertaining thoughts of building up a crankset with short short bulletproofs. Technically, reducing crank length and also decreasing gear-inches, proportionally, should produce the same amount of energy expended per gear inch right?
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Old 06-13-07, 08:12 AM   #2
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energy per gear inch?

It will keep the gain the same if that is what you mean. You foot will move the same distance compared to how far the bike moves forward. You will have to spin very fast and not move your leg much though which is likely to be incredibly inefficient.

Why do you want to do this?
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Old 06-13-07, 08:15 AM   #3
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pedal strike??? low bb??
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Old 06-13-07, 11:12 AM   #4
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small femur id say
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Old 06-13-07, 01:02 PM   #5
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I run 140's (bulletproof), believe it or not. Been riding on them for about 3 years.
I like it because I can fall off of curbs and not have to care what position my feet are in. Zero pedal strike.
Plus I spin. A lot. I like spin.
I've also raced with them in a couple duathlons.

I've also got regular 165s on other bikes, so I'm not THAT weird.
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Old 06-13-07, 01:08 PM   #6
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Give it a try! All ss/fgers know that you can get away with all kinds of improbable sounding ****, and this could be fun. Use rabbit or a similar gear calc to find equivalent gain ratios.
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Old 06-13-07, 01:23 PM   #7
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small femur id say
It's a perfectly nice size!
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Old 06-13-07, 01:34 PM   #8
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Quote:
Originally Posted by jankon73
I run 140's (bulletproof), believe it or not. Been riding on them for about 3 years.
I like it because I can fall off of curbs and not have to care what position my feet are in. Zero pedal strike.
Plus I spin. A lot. I like spin.
I've also raced with them in a couple duathlons.

I've also got regular 165s on other bikes, so I'm not THAT weird.
How tall are you?
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Old 06-14-07, 07:11 AM   #9
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I'm an even 6' tall. Long legs.
I dunno, it just feels better for me than 170/175/180s.
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Old 06-14-07, 07:40 AM   #10
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Quote:
Originally Posted by jankon73
I'm an even 6' tall. Long legs.
I dunno, it just feels better for me than 170/175/180s.
That is really weird. Hope that works out for you in the long term.
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Old 06-14-07, 07:44 AM   #11
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My ladypal's bike has 155s. She's 4'11" and rides a 43cm frame w/ 650C wheels. They're a regular set of fluted campy pista cranks that were milled down for a jr racer... it seems to work for her.
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Old 06-14-07, 12:28 PM   #12
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Here something interesting I found about crank while browsing around

Why crank length is(n't) important.

EDIT: If you combine this with sheldonbrown Crank and Gain ratio info it make sense

http://www.sheldonbrown.com/cranks.html

Last edited by DanPT; 06-14-07 at 12:35 PM.
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