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Old 11-15-10, 08:04 PM   #1
randya
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Emergency Bike Pump Lets You Fill Bike Tires From Car Tires



http://blog.makezine.com/archive/201..._air_from.html

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Old 11-15-10, 08:19 PM   #2
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Car tires. nah.

Truck tires have much higher pressure.
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Old 11-15-10, 08:42 PM   #3
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Except for the pressure problem, it's a great idea. We all know how difficult it is to blow up a bicycle tire using an actual pump.
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Old 11-15-10, 09:06 PM   #4
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Thaaaaaat's GENIOUS! As long as the driver of the car doesn't show up while you're nabbing his air.

Typical car tires are at ~30-35 pounds, which is fine pressure for a desperate MTB or townie bike tire. Road bikes might need to find a nice big cargo truck of some sort- you might get 50-60 pounds out of them.

Two non-locking air chucks might be a better setup- you wouldn't need to flip/lock the two levers, and attaching/detaching your 'pump' in a hurry would be a non-issue. You'd just need some good hand strength.
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Old 11-15-10, 09:16 PM   #5
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Or you could not be an ass and take some air from your other tire.
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Old 11-15-10, 09:22 PM   #6
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Thaaaaaat's GENIOUS! As long as the driver of the car doesn't show up while you're nabbing his air.

.
I had exactly the same reaction. That's one way to get back at the cagers.
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Old 11-15-10, 10:06 PM   #7
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Except for the pressure problem, it's a great idea. We all know how difficult it is to blow up a bicycle tire using an actual pump.
A road-morph pump is pretty easy to get up to 100 psi.
The above idea is a waste of pannier space.
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Old 11-16-10, 07:45 AM   #8
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Originally Posted by GamblerGORD53 View Post
Car tires. nah.

Truck tires have much higher pressure.
Not hardly... most car tires run about 32 PSI, but due to the volume of the car tire, hold quite a bit more air. Bike tires on the other hand may range from 35 PSI to 120 PSI, depending on the type of tire and tube. My beach bike with fat tires holds 35 PSI, my commuter holds 85 PSI, and my road bike 120 PSI; all the tires on all my bikes probably don't equal the volume of one of my truck tires.

Commercial or heavy duty truck tires do run at higher pressures.
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Old 11-16-10, 08:05 AM   #9
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Truck tires usually run at 100psi.

Doesn't matter how much air is in a car tire, you're not getting more pressure then what's in there. I second the road morph, I use the turbo morph which has a fold out dial guage for easier reading.
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Old 11-16-10, 08:55 AM   #10
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Or you could not be an ass and take some air from your other tire.
Or be an even bigger one and steal it from 5 other bikes....
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Old 11-16-10, 11:43 AM   #11
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So the idea is to take air from someone else's tire assuming that the tire available would have enough pressure (almost certainly not true).

One problem is that generally when I have a flat, I am out where there are no trucks or cars parked nearby. So I just carry a hand pump and pump up my tire.
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Old 11-16-10, 12:08 PM   #12
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It's bigger than two CO2 cartridges and the nozzle. Useless. Might cost less, but I'll tell you what does cost a lot: The beat down you get when someone catches you nabbing their air.

Spend $15, buy the CO2 system. Or spend $30 and get a usable frame pump.
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Old 11-16-10, 12:23 PM   #13
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Seems like it would be illegal somehow. Stealing air? Hm..... Is that theft or vandalism?
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Old 11-16-10, 12:52 PM   #14
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Or be an even bigger one and steal it from 5 other bikes....
Hahaha! Half full, three-quarters, 7/8 ... a new twist on Zeno's paradox.
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Old 11-16-10, 12:59 PM   #15
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A road-morph pump is pretty easy to get up to 100 psi.
The above idea is a waste of pannier space.
I know. I was being facetious.
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Old 11-16-10, 01:07 PM   #16
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No, the air is going to flow from your bike tire into the car tire.
Useless unless you ride MTB off road, where you're not going to find a car handy , anyway.
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Old 11-16-10, 01:17 PM   #17
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Hahaha! Half full, three-quarters, 7/8 ... a new twist on Zeno's paradox.
First fill up from the cruiser, high volume will mean most of their pressure will transfer. Then work your way up the line, leaving the highest pressure tire for last.
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Old 11-16-10, 02:16 PM   #18
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I know. I was being facetious.
OK, but it did sound just like those who actually do whine about hand pumps.
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