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Broken Presta valve

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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)

Broken Presta valve

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Old 01-08-10 | 10:12 PM
  #26  
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Originally Posted by happypills
Here's something to keep in mind..... the maximum psi includes you on the bike too in addition to the air pressure in the tire already.....
I believe you're mistaken
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Old 01-09-10 | 01:48 AM
  #27  
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$2 at any bike shop in the US

https://www.treefortbikes.com/542_333...a-Adapter.html

Problem solved. NEXT.
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Old 01-09-10 | 04:58 AM
  #28  
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Originally Posted by elTwitcho
I believe you're mistaken
Seriously. Otherwise I'd have to invite a friend over to pump up my tires while I sat on the bike every time, and that would be tedious for all concerned.
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Old 01-09-10 | 09:05 AM
  #29  
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Originally Posted by bigvegan
Seriously. Otherwise I'd have to invite a friend over to pump up my tires while I sat on the bike every time, and that would be tedious for all concerned.
Dang! I guess I need to start making friends.
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Old 01-09-10 | 11:35 AM
  #30  
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How much does the pressure in the tires change with the rider sitting on the bike/not sitting on it anyway?
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Old 01-09-10 | 11:38 AM
  #31  
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Everyone's weight varies but it averages around 45,000 psi.
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Old 01-09-10 | 11:42 AM
  #32  
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Originally Posted by carleton


$2 at any bike shop in the US

https://www.treefortbikes.com/542_333...a-Adapter.html

Problem solved. NEXT.
Not at any bike shop, no. They are 94 cents + tax ($1.00) at my shop, and several others in the area.
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Old 01-09-10 | 12:41 PM
  #33  
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Originally Posted by rogwilco
How much does the pressure in the tires change with the rider sitting on the bike/not sitting on it anyway?
I imagine that depends on things like tire volume, how stiff the sidewalls of the tire are and the like, but I'd be pretty confident that the answer is not a significant amount at all
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Old 01-09-10 | 12:51 PM
  #34  
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Originally Posted by rogwilco
How much does the pressure in the tires change with the rider sitting on the bike/not sitting on it anyway?
It's inversely proportional to the cube root of the Q-factor.
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