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)

Soon to be SS commuter

Old 08-21-07, 05:46 PM
  #26  
baxtefer
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Originally Posted by abortionpunch View Post
The higher ratios give you the option to always go faster and accelerate QUICKLY.
Now abortionpunch is being a ******, but note how he didn't say that he was accelerating from a standstill.
If he's referring to accelerating while already moving (in a gear that puts his cadence in his powerband) then he has a point. (manual transmission analogy: passing a car in 4th, vs. passing in 1st). It is pretty hard to accelerate more if you're already spinning your gear out.

If he actually did mean accelerating faster from stoplights in a high gear, then he is a ******** ******.
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Old 08-21-07, 05:48 PM
  #27  
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Originally Posted by baxtefer View Post
Now abortionpunch is being a ******, but note how he didn't say that he was accelerating from a standstill.
If he's referring to accelerating while already moving (in a gear that puts his cadence in his powerband) then he has a point. (manual transmission analogy: passing a car in 4th, vs. passing in 1st). It is pretty hard to accelerate more if you're already spinning your gear out.

If he actually did mean accelerating faster from stoplights in a high gear, then he is a ******** ******.
but he did say always go faster
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Old 08-21-07, 05:53 PM
  #28  
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Originally Posted by lbthomps View Post
Hey abortionpunch go read this paper and then come back and tell us what gear ratios and gearings are most efficient


Effects of Frictional Loss on Bicycle Chain Drive Efficiency
Journal of Mechanical Design -- December 2001 -- Volume 123, Issue 4, pp. 598-605
ABSTRACT: "Chain drive efficiency has been studied to understand energy loss mechanisms in bicycle drive trains, primarily for derailleur-type systems. An analytical study of frictional energy loss mechanisms for chain drives is given along with a series of experimental measurements of chain drive efficiency under a range of power, speed and lubrication conditions. Measurements of mechanical efficiency are compared to infrared measurements indicating that frictional losses cannot account for the observed variations in efficiency. The results of this study indicate that chain tension and sprocket size primarily affect efficiency and that non-thermal loss mechanisms dominate overall chain drive efficiency."
That's not really relevant. Drivetrain resistnace is miniscule when compared to aero and rolling resistance.
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Old 08-21-07, 05:55 PM
  #29  
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Originally Posted by MIN View Post
That's not really relevant. Drivetrain resistnace is miniscule when compared to aero and rolling resistance.
It is relevant when he is claiming that 52x16 is more efficient than 42x16 or some other lower gear
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Old 08-21-07, 05:59 PM
  #30  
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Originally Posted by lbthomps View Post
It is relevant when he is claiming that 52x16 is more efficient than 42x16 or some other lower gear
in terms of just drivetrain efficiency, it actually is.
bigger chainring/cog = less bend in chain = less friction = higher efficiency.
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Old 08-21-07, 06:03 PM
  #31  
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Originally Posted by baxtefer View Post
in terms of just drivetrain efficiency, it actually is.
bigger chainring/cog = less bend in chain = less friction = higher efficiency.
Yes but in the larger picture - of all the factors that conspire against you to work harder on the bike- it's a non-issue because aero and rolling resistance plays a much more pronounced role.

The issue at hand is a discussion of torque.* Homeboy is claiming that he has torque enough to be a masher. It's not a baseless claim - people have different styles. Compare and contrast Jan Ulrich (masher who spins against a big gear) and Lance Armstrong (spins above 90 rpm all the time). Physiologically, the spinner is more efficient because mashing causes early muscle fatigue. However, both can put out the same power** at different RPMs.


* Torque is essentially the result of how hard (not how fast) you can press on the pedals.

**Power is the rate you can do that. To most cyclists, having low enough gears, power is the primary concern. If it starts to become too difficult to push on the pedals as the slope increases, you gear down and spin faster.
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Old 08-21-07, 06:05 PM
  #32  
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this thread is stupid
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Old 08-21-07, 06:15 PM
  #33  
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Originally Posted by baxtefer View Post
in terms of just drivetrain efficiency, it actually is.
bigger chainring/cog = less bend in chain = less friction = higher efficiency.
true but in that paper it also reveals that higher rpms are more efficient...But like MIN said its all for not once you start to take into the other factors that will affect your overall speed much more drastically
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Old 08-21-07, 06:16 PM
  #34  
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It was cool when it was just pictures of my sick new frame.
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Old 08-21-07, 06:16 PM
  #35  
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Originally Posted by abortionpunch View Post
And gordiep, it's always nice to see someone criticize another for things said that weren't in the kindest tone while simultaneously wishing them harm.
Didn't mean to hurt your feelings, sonny. Yeah, we're really a tough bunch 'round here. Full of contradictions.
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Old 08-21-07, 06:24 PM
  #36  
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No harm done, just an observation.


Admittedly this thread has delved into a more specific realm than I'm knowledgeable of. I'm working off of experience and trial and error. Time to read up.
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Old 08-21-07, 06:25 PM
  #37  
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Originally Posted by abortionpunch View Post
It was cool when it was just pictures of my sick new frame.
no ****.. it is a sick looking frame too..
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Old 08-21-07, 06:25 PM
  #38  
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Originally Posted by abortionpunch View Post
It was cool when it was just pictures of my sick new frame.
You mean your sick new conversion?

I would have responded earlier, but I'm stuck over on scrabulous.com talking to trailer park ladies about their cats and whooping their asses by hundreds of points.

Last edited by crushkilldstroy; 08-22-07 at 01:15 AM.
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Old 08-21-07, 08:19 PM
  #39  
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Originally Posted by crushkilldstroy View Post
You're nuts. I commute on a 44x17. Sayin'.

+1
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