Soon to be SS commuter
08-21-07 | 05:46 PM
#26
Cornucopia of Awesomeness
Joined: Oct 2004
Posts: 4,847
Likes: 0
From: not where i used to be
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 ******** ******.
08-21-07 | 05:48 PM
#27
spin
Joined: Jan 2005
Posts: 1,170
Likes: 0
From: Champaign, IL
Bikes: raleigh m-60, azonic steelhead, schwinn world sport fixed gear
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 ******** ******.
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 ******** ******.
08-21-07 | 05:53 PM
#28
big ring
Joined: Mar 2007
Posts: 5,838
Likes: 1
From: philadelphia
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."
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."
08-21-07 | 05:55 PM
#29
spin
Joined: Jan 2005
Posts: 1,170
Likes: 0
From: Champaign, IL
Bikes: raleigh m-60, azonic steelhead, schwinn world sport fixed gear
08-21-07 | 05:59 PM
#30
Cornucopia of Awesomeness
Joined: Oct 2004
Posts: 4,847
Likes: 0
From: not where i used to be
08-21-07 | 06:03 PM
#31
big ring
Joined: Mar 2007
Posts: 5,838
Likes: 1
From: philadelphia
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.
08-21-07 | 06:15 PM
#33
spin
Joined: Jan 2005
Posts: 1,170
Likes: 0
From: Champaign, IL
Bikes: raleigh m-60, azonic steelhead, schwinn world sport fixed gear
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
08-21-07 | 06:16 PM
#35
.
Joined: Jun 2007
Posts: 526
Likes: 0
08-21-07 | 06:24 PM
#36
Thread Starter
automobile gravitron
Joined: Aug 2007
Posts: 216
Likes: 0
From: event horizon
Bikes: Kona Blast, Scwinn Traveler, Older Stumpjumper, Lemond Maillot Juane, Surly Crosscheck
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.
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.
08-21-07 | 06:25 PM
#38
Hello.
Joined: Jun 2005
Posts: 2,902
Likes: 2
From: West Seattle
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.
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.
