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Clydesdales/Athenas (200+ lb / 91+ kg) Looking to lose that spare tire? Ideal weight 200+? Frustrated being a large cyclist in a sport geared for the ultra-light? Learn about the bikes and parts that can take the abuse of a heavier cyclist, how to keep your body going while losing the weight, and get support from others who've been successful.

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Old 01-08-07, 11:00 PM   #1
ratebeer
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WIll rolling resistance improve as I lose weight?

How much does weight play in rolling resistance? It will probably deform the tires more. WIll it affect the hubs as well? Is there a formula somewhere that will tell me what my rolling resistance will be at 180 pounds versus 220?
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Old 01-08-07, 11:40 PM   #2
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Originally Posted by ratebeer
How much does weight play in rolling resistance? It will probably deform the tires more. WIll it affect the hubs as well? Is there a formula somewhere that will tell me what my rolling resistance will be at 180 pounds versus 220?
This takes into account drag, rolling resistance, wind speed, altitude/air density, and temp/air density as well as grade! How's that!

http://www.kreuzotter.de/english/espeed.htm


Edit: Also tire size, pressure, riding position, and bike geometry
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Old 01-08-07, 11:44 PM   #3
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Also weight, and will give wattage results that agree closely with my bike computer, so the designer has a consistent algorithm.

You can get your brake HP even if you want by going to this site and entering your wattage output as a decimal portion of a kilowatt.
http://www.markhorrell.com/tools/power.asp
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Old 01-09-07, 12:23 AM   #4
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Wow, very cool. Thanks!

So Zabriskie's legendary TdF time trial was sustaining around 500 watts for the duration of the event?! Oh my.

This app is selling me new tires! Hehehe. They should have ads off to the side.
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Old 01-09-07, 07:33 AM   #5
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wow, I have some work to do to get to 500
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Old 01-09-07, 08:48 AM   #6
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Quote:
Originally Posted by ratebeer
Wow, very cool. Thanks!

So Zabriskie's legendary TdF time trial was sustaining around 500 watts for the duration of the event?! Oh my.

This app is selling me new tires! Hehehe. They should have ads off to the side.
Hmm, I never see ads at either one, but then again, I have popup blockers operating and don't use IE. I use Firefox and require specific authorization to be clicked before any added content or script can run.
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Old 01-09-07, 11:15 AM   #7
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Nice site. Glad someone is able to figure all that stuff out!
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Old 01-09-07, 11:20 AM   #8
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Originally Posted by Tom Stormcrowe
Hmm, I never see ads at either one, but then again, I have popup blockers operating and don't use IE. I use Firefox and require specific authorization to be clicked before any added content or script can run.
No, no no. Sorry, the site sold me new tires not because of ads. I just plugged in my touring tires versus racing slicks. I gained 1.1 mph! BOOM, SOLD!!! CHA-CHING!!
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Old 01-09-07, 11:23 AM   #9
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I think losing weight will increase resistance. After all, you will be much less round.

Wait, you were talking about tires?! (I have been pretty round myself in the past, not picking on anyone)
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