How to re-seat a tyre bead in Iceland

http://www.youtube.com/watch?v=Mk9n2qyTPic

Could this be fake? The shadow looks a bit weird to me on the tyre.

The diagram didn't show how the air gets into a pressurized chamber. Since it's a clincher type tire, and clincher rims don't hold air pressure at all, I'm guessing this tire uses a regular bike tube, and there's an external device from the tire to the tube valve similar to the valve on a bike pump. I'm seeing something like that in the photos of the wheel before the ride. This device would also have to contain a gauge so it would know when to stop putting the air into the chamber.

The only advantage this product provides is eliminating regular maintenance pumping (10 strokes once every few weeks). It does not eliminate the pumping needed when you get a proper flat, because you can't roll with no air in it at all. This product would be aimed only at recreational cyclists who want to occasionally avoid using a pump. Seriously?

Also given that the pump's life is over once that outer tube got cut, that's the whole point of the tire gone. I guess it'd still continue to function as a normal tire, but where's the fun in that?>> ^albrite30:

>> ^GenjiKilpatrick:
..what happened when you get a couple nails/shards of glass in 'em?

I was wondering that too. I would suspect that they would have to buy a new outer tube to surround the aluminum. Great idea, but perhaps not cost effective yet.
[edit]

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.

>> ^Fantomas:

I wish I was self inflating
you can't reach your own valve?

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.

>> ^Fantomas:

I wish I was self inflating


They have pills for that now.

>> ^Nexxus:

It doesn't seem very reliable as that part of the tire would wear down first. One hard brake lockup, and it's useless.


Exactly, that is a major flaw: the mini tube seems to be serious flaw unless it is made of something far more durable than normal tires.

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.

Your video, Self Inflating Tyre, has made it into the Top 15 New Videos listing. Congratulations on your achievement. For your contribution you have been awarded 1 Power Point.

>> ^GenjiKilpatrick:

..what happened when you get a couple nails/shards of glass in 'em?


I was wondering that too. I would suspect that they would have to buy a new outer tube to surround the aluminum. Great idea, but perhaps not cost effective yet.

I wasn't really a Alexander fan, but a Diogenes fan. Probably one of my most famous favorite philosophers, what other philosopher got into fights with people for being a dick?! One thing I did like about Alexander was his courage that was down right fool hearty. My favorite story is about Siege of Tyre where they build a road to an island, and the he climbed the battlements ahead of his troops and jumped over the wall and started fighting. His soldiers didn't, and slow to realize of his decision, they finally noticed Alexander fighting the city Guard completely by himself. This rallied his troops to the point that the Island of Tyre was taken by an ancient army without a navy, a thing of legend.

Sad to say, I have only a superficial knowledge of the teachings of the famous Thomas Aquinas. Most of my energies have been on more secular minds. With that said, though, some of my favorite Christian minds are Søren Kierkegaard and George Berkeley. I didn't realize that Existentialism actually has a Christian heritage, I found that rather shocking as most christian's seem rather dogmatic when it comes to finding meaning in their lives. It struck me as interesting that there wasn't a unified feeling among christions to the deeper questions of meaning in life.

George Berkeley's metaphysics are awesome. He represents the only metaphysical experience of the universe that I think humans minds could fully comprehend. Granted, that doesn't mean it is correct, but I think the human mind is really only satisfied with the notion of minds, it is why "Gods" have always been with us, we need minds to be in control.

Sadly, though, even those great christian minds could not save my faith. There were to many problem I had with Christianity and the Bible that my faith was finally crowded out by doubt. You might call me the seed that fell among the thorns that was quickly drowned out of the sun. To me, though, my "Thorns" are truth and knowledge, so I hardly feel embittered or lessened.

In reply to this comment by Lawdeedaw:
Ah, Alexander. I don't know why I think of him a hero--he was bloodthirsty and ruthless, but I guess I admire him neverthelss. (Saw your quote by him.)

BTW, a really good religious scholar (The only one I like) is Aquainis (SP?)