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It can be a hassle to carry a bicycle pump everywhere you go. Instead use this short length of tube with valves on both ends. Connect one end to your tire, and the other to another bicycle to instantly top-up your air pressure.
CO2 inflator
http://www.aerotech...e_bgCFQya4Aod6AsAuA
[bs0u0155, Aug 14 2013]
Push-pull designs...
http://www.ems.com/...e_bgCFcuj4AodPxgAYA
[bs0u0155, Aug 14 2013]
[link]
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Would that not just give you two half-flat tyres? |
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Yes, I suppose because the pressures would balance out. I guess the valves would have to be one-way, you know the kind with the ball inside that blocks the passage. This would only work once connected to bikes with higher air-pressure. For example connecting a 60psi mountainbike tire with a 120psi racing bike tire. |
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But the mountain bike tyre will be perhaps three or
four times the volume of the racing tyre. This could
work if you had one flat tyre amongst many, taking a
little air from each, but not so well as a one-to-one. |
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Folding bikes typically have small tires, like those on kids bikes. This would probably be a practical device for those. |
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I still think bikes should be air operated, so ideally bike tires would be inflated by the bike itself. |
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In the urban environment, you could steal it from
truck/van tyres, nice high pressure and lots of
volume relative to the bike tire. However, you can
get some pretty small pumps. <link> |
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Abstracting air from high-pressure truck and
bus tyres would work well, given the
disproportionate volumes. A pressure
regulator would be highly advisable. |
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Buses have the advantage that they make
predictable stops. |
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Aircraft tyres would be even better, being
filled with dry Nitrogen. They also make
predictable stops. |
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