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Got a flat?

by RL Policar

Our buddies from Blue Collar MTB originally posted this…

When commuting around town it’s best to carry around as little gear as possible. So most of us usually end up with one of those tiny hand pumps that take about a half hour to fill a tire up with. Instead, why not steal some air from those evil SUVs people are driving around?

SUV Pump

Learn how to make your own SUV Pump HERE.

 
Burley nomad 229

7 Responses to “Got a flat?”

  1. [...] uecollarmtb.com/2006/03/28/borrow-some-air-automatic-bike-pump/”>Borrow some air. via Commute by Bike This entry was posted on Tuesday, March 2 [...]

  2. Jeff says:

    Aren’t car tires only pumped up to 45 – 55 PSI? This wouldn’t do much for a road bike that needs 110 PSI.

  3. RL Policar says:

    You’re right Jeff. I’m no scientist, but I would think the volume of the Hummer’s tire could make up for the needed air to fill a bicycle tire.

  4. Jay says:

    RL and Jeff,

    The volume of the Hummer tire won’t cause the road bike tire to inflate to 110psi, unless you stacked 5 Hummers on top of each other and sucked the air out of the tires from the Hummer on the bottom. I don’t think the intent is to pump it up to the max on your road tires, but just to get you enough air to make it home when you have a flat.

  5. Moe says:

    I guess I’m in luck! My Kona Smoke tires only need 40 PSI!

  6. OkiMike says:

    That’s 110psi, meaning pounds per square inch. Since the Hummer has much more volume (all the space inside the tire), there’s plenty of air to go around. The trick is to work the pressure up. But since there’s the weight of the body of the Hummer pushing down on the tire, voila!, instant work.

  7. distipel says:

    Just to finish this off: A 40 psi tire could only raise the pressure of a bike tire to 40 psi, no matter how big the car (or hummer) tire. Think of it this way: the air in our atmosphere is at roughly 14 psi, but the atmosphere won’t pump up bike tires to 110 psi, even though there is lots more air in the atmosphere. When you connect two tires by an open tube, both will always end up with the same pressure, regardless of size. If you don’t believe me, try it out.

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