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.
-- rcarty, Aug 14 2013

CO2 inflator http://www.aerotech...e_bgCFQya4Aod6AsAuA
[bs0u0155, Aug 14 2013]

Push-pull designs... http://www.ems.com/...e_bgCFcuj4AodPxgAYA
[bs0u0155, Aug 14 2013]

Would that not just give you two half-flat tyres?
-- MaxwellBuchanan, Aug 14 2013


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.
-- rcarty, Aug 14 2013


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.
-- MaxwellBuchanan, Aug 14 2013


Folding bikes typically have small tires, like those on kids bikes. This would probably be a practical device for those.

I still think bikes should be air operated, so ideally bike tires would be inflated by the bike itself.
-- rcarty, Aug 14 2013


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>
-- bs0u0155, Aug 14 2013


Abstracting air from high-pressure truck and bus tyres would work well, given the disproportionate volumes. A pressure regulator would be highly advisable.

Buses have the advantage that they make predictable stops.

Aircraft tyres would be even better, being filled with dry Nitrogen. They also make predictable stops.
-- 8th of 7, Aug 14 2013



random, halfbakery