That's very true. The simple fact that because the pressure of the tire off the rim is going to be normalized with the atmospheric pressure, even if you seated the tire back on manually, you'd have a zero pressure delta between outside the tire and inside. For a tire to run properly, usually you have to have a difference of approximately 30 psi. So yea, case closed. THANKS!>> ^messenger:

That might work better, but to pressurize a tire, you need significantly more gas than just the little bit that comes out of the spray can, and it must be at ambient temperature too to count. Clearly, the only reason this inflates the tire at all is the heat. Here's a thought experiment that disproves the "stays inflated" myth:
Consider that you need to have much more gas inside the tire than outside for it to stay inflated at ambient temperature. Before lighting the gas, there's the same pressure inside and outside the tire because the two areas are contiguous. When she lights the fire, the gas inside expands rapidly, and lots of it escapes, so now, while there's a greater volume of gas inside the tire than before, this is due to a greatly reduced density, so there's actually less gas inside than before, which is why there was a vacuum. Using heat, there will always be less gas inside than before. It's not even worth experimenting. The only way something like this could work is with compressed gas, which you certainly wouldn't want to do because that would blow the tire up if it were lit on fire.
I think there are self-inflating tires already on the market that have compressed gas cartridges built in, triggered by a sensor that fixes flats by spraying a sealant inside, then lots of pressurized gas, probably CO2. They don't use fire.>> ^rottenseed:
So the limiting reactant would be the starter fluid and the air in the tire. Oxygen to be more exact. Because you want enough forces to seat the tire, but not so much it removes all of the gases from the tire, maybe they should have tried less starter fluid. If that's depleted in the reaction quickly leaving enough energy to seat the tire, but also enough oxygen left over from the reaction, you might end up with a working tire.
Somebody please double check my thought process, but I think it's definitely worth more experimentation.

Basically bath salts are extremely dangerous stimulants that kids are using because kids will do anything to get high and marijuana is still illegal.

The thumbnail image for this video has been updated - thumbnail added by Barseps.

>> ^chilaxe:

@Jinx
I hate to interrupt your anti-intellectual parade and your lack of real facts or non-ignorant assertions, but have you heard of this great new site called Google.com?
Google search: muslim welfare rate europe OR britain OR sweden

Haha, anti-intellectual.

I was taking issue with your "once Europe is majority Muslim". I've read tripe like that before in a paper...what was it called again. Oh yah. The Daily Mail. Or was it The Sun. I forget.

Heres something for you to mull over: http://www.telegraph.co.uk/news/uknews/1542427/One-third-of-homes-dependent-on-benefits.html
Oh, and before you say the majority of that 1/3 are Muslim consider that the 2001 census shows that only 2.7% of the UK is Muslim. Somewhat less than the 15.5% who identify as "no religion", but I don't see anybody expecting them to "take over Europe". So ok, 40%>33%, but its hardly the case that Islam is climbin in our windows and snatchin our welfares up. Its much the same story in the rest of Europe. Edumacate yourself thx.

Ps. I hate Islam, I just hate this distortion of reality more.

>> ^chilaxe:
@Jinx
I hate to interrupt your anti-intellectual parade and your lack of real facts or even non-ignorant assertions, but have you heard of this great new site called Google.com?
Google search: muslim welfare rate europe OR britain


Without wanting to be the second person to invoke your wrath, any chance you could link to specific articles instead of a link to the Google home page please? Preferably From sources within the EU or the UK, thankyouverymuch

@Jinx

I hate to interrupt your anti-intellectual parade and your lack of real facts or non-ignorant assertions, but have you heard of this great new site called Google.com?

Google search: muslim welfare rate europe OR britain OR sweden

after about a minute all i could hear was "psi lance"

You'll probably never feel the difference, even in a side-by-side comparison, and even if you can, it's not like you're inflating all the time:

1) Inflating from 22 to 52 psi takes maybe 40 strokes of a small, cheap hand pump, and a bit of effort (if your tires take longer or are more difficult to inflate, it's probably because they're higher pressure). Now stretch that same job over 3.5 minutes at (guessing this guy's cadence) a moderate 80 pedal revolutions/minute.

80 revs x 3.5 mins = 280 pedal revolutions
280 revs x 2 pedal strokes (right and left) per revolution = 560 pedal strokes

40 pump strokes / 560 pedal strokes = 1:14, or a touch over 7%

So per stroke you're doing 7% of the work of a hand inflation job. That's just about negligible, considering you're doing it with super-efficient pedal power, not an awkward bike pump.

2) Furthermore, that would only be for the first mile. Everything after that would be just like a normal bike because it would stop pumping. When the tire got a little under-inflated, it would pump for a couple spins of the tire, then be done. You'll never know.>> ^grinter:

>> ^dannym3141:


The tire should resist being compressed by an amount which would largely depend on the work needed to raise the bike and its rider by fractions of a milimetre per turn of the pedal which would not be very much extra energy to put in. You're also spreading that "pumping up the tire" energy over thousands of pedal turns. I'm almost certain it'd be negligible.
It's similar to putting a dynamo on a bike to power a light - that light requires energy to run, and it has to come from somewhere (the dynamo resists the motion of the wheel turning) - meaning you have to pedal ever so slightly harder. You wouldn't notice.

Well, you sort of hit on my point. At first it seems like it would be very little energy, but you are doing the same (or similar) amount of work as you would do when inflating the tire directly (the same job is getting done). I know that others have claimed that they don't get tired when blowing up a tire (no pun intended), but for me it is enough of a job that I wouldn't want to be doing it the entire duration of every bike ride that I ever take.
Similarly, most commuters and people riding bikes for sport don't want to deal with the extra energy (and mass) it takes to drive a dynamo powered headlamp, so they choose a battery powered model instead.

Ok. It looks like we mostly agree on the subject, but just have different opinions on whether it would bother us. I ride a lot too. I guess I'm just too picky.

In reply to this comment by dannym3141:
>> ^grinter:

>> ^dannym3141:
>> ^grinter:
It might actually save money if you could get it to work on car tires. Under inflation can seriously shorten the life of your car tires.
another thought: think about how tired you get pumping a tire from 22 to 52 psi. With the self inflating tire you are still doing the same amount of work.. and while the tire stops filling after reaching the desired pressure, it looks like you keep on working the mechanism with every pedal stroke. That kind of wasted energy can really add up.
Of course, energy is wasted through movement of the tires all the time anyway - just feel them after a ride; they are hot. The trick must be in getting the energy wasted by the pump mechanism to overlap with that energy that would be wasted even with a normal tire.

The tire should resist being compressed by an amount which would largely depend on the work needed to raise the bike and its rider by fractions of a milimetre per turn of the pedal which would not be very much extra energy to put in. You're also spreading that "pumping up the tire" energy over thousands of pedal turns. I'm almost certain it'd be negligible.
It's similar to putting a dynamo on a bike to power a light - that light requires energy to run, and it has to come from somewhere (the dynamo resists the motion of the wheel turning) - meaning you have to pedal ever so slightly harder. You wouldn't notice.

Well, you sort of hit on my point. At first it seems like it would be very little energy, but you are doing the same (or similar) amount of work as you would do when inflating the tire directly (the same job is getting done). I know that others have claimed that they don't get tired when blowing up a tire (no pun intended), but for me it is enough of a job that I wouldn't want to be doing it the entire duration of every bike ride that I ever take.
Similarly, most commuters and people riding bikes for sport don't want to deal with the extra energy (and mass) it takes to drive a dynamo powered headlamp, so they choose a battery powered model instead.


Well i mean obviously cyclists cycling for sport won't use any lights to avoid weight, and they have to accurately control such things.

We're talking about the kind of difference between going up some stairs and going up some stairs with a jacket on and after a big meal. It's completely unnoticeable to your strong leg muscles to carry that meal and the jacket up the stairs, but if you stood at the bottom and tried to throw them both up you'd probably find that a bit tiring. Know what i mean? I get your point but i just don't think you'd notice. I cycle a lot and the tiniest things can make it feel easy or tiring, would you notice a miniscule change?

Fair enough though if the potentially large eventual added up calories puts you off.

>> ^grinter:

>> ^dannym3141:
>> ^grinter:
It might actually save money if you could get it to work on car tires. Under inflation can seriously shorten the life of your car tires.
another thought: think about how tired you get pumping a tire from 22 to 52 psi. With the self inflating tire you are still doing the same amount of work.. and while the tire stops filling after reaching the desired pressure, it looks like you keep on working the mechanism with every pedal stroke. That kind of wasted energy can really add up.
Of course, energy is wasted through movement of the tires all the time anyway - just feel them after a ride; they are hot. The trick must be in getting the energy wasted by the pump mechanism to overlap with that energy that would be wasted even with a normal tire.

The tire should resist being compressed by an amount which would largely depend on the work needed to raise the bike and its rider by fractions of a milimetre per turn of the pedal which would not be very much extra energy to put in. You're also spreading that "pumping up the tire" energy over thousands of pedal turns. I'm almost certain it'd be negligible.
It's similar to putting a dynamo on a bike to power a light - that light requires energy to run, and it has to come from somewhere (the dynamo resists the motion of the wheel turning) - meaning you have to pedal ever so slightly harder. You wouldn't notice.

Well, you sort of hit on my point. At first it seems like it would be very little energy, but you are doing the same (or similar) amount of work as you would do when inflating the tire directly (the same job is getting done). I know that others have claimed that they don't get tired when blowing up a tire (no pun intended), but for me it is enough of a job that I wouldn't want to be doing it the entire duration of every bike ride that I ever take.
Similarly, most commuters and people riding bikes for sport don't want to deal with the extra energy (and mass) it takes to drive a dynamo powered headlamp, so they choose a battery powered model instead.


Well i mean obviously cyclists cycling for sport won't use any lights to avoid weight, and they have to accurately control such things.

We're talking about the kind of difference between going up some stairs and going up some stairs with a jacket on and after a big meal. It's completely unnoticeable to your strong leg muscles to carry that meal and the jacket up the stairs, but if you stood at the bottom and tried to throw them both up you'd probably find that a bit tiring. Know what i mean? I get your point but i just don't think you'd notice. I cycle a lot and the tiniest things can make it feel easy or tiring, would you notice a miniscule change?

Fair enough though if the potentially large eventual added up calories puts you off.

>> ^dannym3141:

>> ^grinter:
It might actually save money if you could get it to work on car tires. Under inflation can seriously shorten the life of your car tires.
another thought: think about how tired you get pumping a tire from 22 to 52 psi. With the self inflating tire you are still doing the same amount of work.. and while the tire stops filling after reaching the desired pressure, it looks like you keep on working the mechanism with every pedal stroke. That kind of wasted energy can really add up.
Of course, energy is wasted through movement of the tires all the time anyway - just feel them after a ride; they are hot. The trick must be in getting the energy wasted by the pump mechanism to overlap with that energy that would be wasted even with a normal tire.

The tire should resist being compressed by an amount which would largely depend on the work needed to raise the bike and its rider by fractions of a milimetre per turn of the pedal which would not be very much extra energy to put in. You're also spreading that "pumping up the tire" energy over thousands of pedal turns. I'm almost certain it'd be negligible.
It's similar to putting a dynamo on a bike to power a light - that light requires energy to run, and it has to come from somewhere (the dynamo resists the motion of the wheel turning) - meaning you have to pedal ever so slightly harder. You wouldn't notice.


Well, you sort of hit on my point. At first it seems like it would be very little energy, but you are doing the same (or similar) amount of work as you would do when inflating the tire directly (the same job is getting done). I know that others have claimed that they don't get tired when blowing up a tire (no pun intended), but for me it is enough of a job that I wouldn't want to be doing it the entire duration of every bike ride that I ever take.
Similarly, most commuters and people riding bikes for sport don't want to deal with the extra energy (and mass) it takes to drive a dynamo powered headlamp, so they choose a battery powered model instead.

>> ^grinter:

It might actually save money if you could get it to work on car tires. Under inflation can seriously shorten the life of your car tires.
another thought: think about how tired you get pumping a tire from 22 to 52 psi. With the self inflating tire you are still doing the same amount of work.. and while the tire stops filling after reaching the desired pressure, it looks like you keep on working the mechanism with every pedal stroke. That kind of wasted energy can really add up.
Of course, energy is wasted through movement of the tires all the time anyway - just feel them after a ride; they are hot. The trick must be in getting the energy wasted by the pump mechanism to overlap with that energy that would be wasted even with a normal tire.


The tire should resist being compressed by an amount which would largely depend on the work needed to raise the bike and its rider by fractions of a milimetre per turn of the pedal which would not be very much extra energy to put in. You're also spreading that "pumping up the tire" energy over thousands of pedal turns. I'm almost certain it'd be negligible.

It's similar to putting a dynamo on a bike to power a light - that light requires energy to run, and it has to come from somewhere (the dynamo resists the motion of the wheel turning) - meaning you have to pedal ever so slightly harder. You wouldn't notice.

I don't get tired at all with a full sized bicycle pump. Bicycle tires just aren't that big. If i could do it with my legs, I doubt I'd even feel it.

>> ^grinter:

think about how tired you get pumping a tire from 22 to 52 psi.

It might actually save money if you could get it to work on car tires. Under inflation can seriously shorten the life of your car tires.

another thought: think about how tired you get pumping a tire from 22 to 52 psi. With the self inflating tire you are still doing the same amount of work.. and while the tire stops filling after reaching the desired pressure, it looks like you keep on working the mechanism with every pedal stroke. That kind of wasted energy can really add up.
Of course, energy is wasted through movement of the tires all the time anyway - just feel them after a ride; they are hot. The trick must be in getting the energy wasted by the pump mechanism to overlap with that energy that would be wasted even with a normal tire.

>> ^handmethekeysyou:

You're right, still not a single study or report devoted to statistics.
Lots moe sensationalist stories, though.>> ^Opus_Moderandi:
>> ^handmethekeysyou:
I tried googling this. Not a single report or study devoted to "
how many traffic stops per year result in shootings" on the first page. Unsurprisingly, many sensationalist news stories.>> ^MrFisk:
How many cars are pulled over in the U.S., in a year? How many result in a fatality to the officer? I'm trying to figure out if it's more likely they'll be shot, hit by lightning, or bitten by a shark.


Try googling "cop killed during traffic stop"



Weird... I guess you'll have to do it yourself.