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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 04-25-13, 12:37 AM   #1
DanWho
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Tire pressure and size

Last week I was reading and found a conversation where someone had listed tire pressures and tire size formulas to figure out max weights for tires and pressures. I was going to bookmark it then but the computer did a hiccup and after rebooting I have been unable to find it again. I'm sure that I'm not the only one that thought of bookmarking that page, could someone point me in the right direction please?

Thank you
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Old 04-25-13, 12:43 AM   #2
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page might be in your browser history if it was recent
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Old 04-25-13, 02:54 AM   #3
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about 1/2 way down in this page it has a chart like you talk about... but only goes to about 150lbs for rider weight :-/
http://janheine.wordpress.com/2010/1...-and-pressure/
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Old 04-25-13, 02:56 AM   #4
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and heres one even better
http://www.bccclub.org/documents/Tireinflation.pdf
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Old 04-25-13, 05:54 AM   #5
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This Bicycle Quarterly article is what I usually see quoted here (and can be found on Sheldon's pages).
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Old 04-25-13, 10:32 AM   #6
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Quote:
Originally Posted by donalson View Post
about 1/2 way down in this page it has a chart like you talk about... but only goes to about 150lbs for rider weight :-/
http://janheine.wordpress.com/2010/1...-and-pressure/
It's not 150 lbs rider weight, it is 150 lbs wheel load. Unlesss you are riding a unicycle (and, hey, that's cool, I don't judge) then wheel load and rider weight are !=.

From the paragraph before the graph in the article: "Note that the loads are given per wheel, not for the entire bike. For most bikes, you can assume between 40% and 45% on the front wheel, and 55% to 60% on the rear."
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Old 04-25-13, 11:19 AM   #7
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The articles are all pretty good, but the one I was reading gave formulas to work with so that you could tell the max weight the tire would take and the pressure needed for the combination of ride, rolling resistance and traction. I checked my page history, because of the crash it didn't save the last page I visited. Oh well, if nothing else I will just continue rereading everything over.
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Old 04-25-13, 12:32 PM   #8
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Originally Posted by Wilfred Laurier View Post
It's not 150 lbs rider weight, it is 150 lbs wheel load. Unlesss you are riding a unicycle (and, hey, that's cool, I don't judge) then wheel load and rider weight are !=.

From the paragraph before the graph in the article: "Note that the loads are given per wheel, not for the entire bike. For most bikes, you can assume between 40% and 45% on the front wheel, and 55% to 60% on the rear."
thanks for pointing that out... It's been a few years since I've read over that stuff and I just glanced over it this time... shame this forum doesn't have a rep system lol...
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Old 04-28-13, 01:01 PM   #9
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I still inflate both of my tires to 8.5 bar (700x25). Minimum indicated is 7.5 bar, and I don't really notice any difference in the front tire...
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