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9 Posts |
 Posted - 06/09/2009 : 13:57:09
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When making power requirement calculations for my groups human powered vehicle project, I encountered questions about rolling resistance which I have not been able to locate the answers to in my textbooks, through anyone I've asked, or through the internet.
To start, I can't find a value for rolling resistance for city tires. I can find values for road tires and a few mountain bike tires, but even those values often do not seem correct and contradict each other. I have heard I will have to contact a vendor for that. For now I have just used a range of values, but I will have to find a more specific value.
Further, how are the coefficients determined? A unitless value is given, but what all does that entail? The coefficient of rolling resistance has to be measured relative to a surface, but surfaces vary in roughness. How is that accounted for, or is there a general rule about a particular surface used for the value?
Could anyone please enlighten me on this subject and/or help me with a value to use for the calculation?
Thank you,
Lesley |
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2 Posts |
Posted - 06/22/2009 : 06:11:52
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just use your bike to run 
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2 Posts |
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1 Posts |
Posted - 01/26/2010 : 00:05:25
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| .. you also have a good explanation given in "Bicycle Science" by David Gordon Wilson, p208. |
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26 Posts |
Posted - 01/27/2010 : 03:05:38
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I’ve been visiting this site for some time, but only recently stumbled on the “Archives” you might start with issue no, 54, which give a series of values for CR.
Seems to me that we need a IHPVA Wiki.
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