Tube pressure

[Pittenger5]

Since we're talking tire pressures for something I Have no clue with, how do you know what pressure to run when youre using tubes with a tubeless tire? For example, in the case of the motarded folk amongst us.

[catch2otwo]

depends on the tire maker

[Pittenger5]

I would think the tire wouldnt have much to do with it, more the tube manufacturer.

[catch2otwo]

pretty sure there is a psi recommendation on the tire itself. i only have used tubes in my dirtbikes never a sumo so not sure how it works with a road tire, but the tube should have no problem handling the 30 some odd psi.

[BLACK SQUIRREL]

pretty sure there is a psi recommendation on the tire itself. i only have used tubes in my dirtbikes never a sumo so not sure how it works with a road tire, but the tube should have no problem handling the 30 some odd psi.

I run my Motard @ like 22-24

and My dirtbikes at 12-11

[Awesome]

PSI = PSI whether it's in a tube or a tubeless tire.

[BLACK SQUIRREL]

PSI = PSI whether it's in a tube or a tubeless tire.

What PSI do you run?

[Awesome]

What PSI do you run?

All of them!

[Awesome]

Was that a serious question?

It depends on the tire, the track and the weather.

[Pittenger5]

PSI = PSI whether it's in a tube or a tubeless tire.

But wouldnt the tube have a different PSI than the tire? It's 2 seperate "layers" and profiles, so wouldnt the PSI of each be exclusive?

[GixerJockey]

But wouldnt the tube have a different PSI than the tire? It's 2 seperate "layers" and profiles, so wouldnt the PSI of each be exclusive?

No...

[Awesome]

But wouldnt the tube have a different PSI than the tire? It's 2 seperate "layers" and profiles, so wouldnt the PSI of each be exclusive?

Does the pressure push on the tire any more or less with a tube in between?

[Pittenger5]

No...

Ok, sounds good

[Pittenger5]

Does the pressure push on the tire any more or less with a tube in between?

I dont know how tubes work, does it fill in every available space air does, or are there gaps in places.

[Awesome]

I dont know how tubes work, does it fill in every available space air does, or are there gaps in places.

here's how it works: tubeless tires have invisible tubes in them.

[Pittenger5]

here's how it works: tubeless tires have invisible tubes in them.

Correct ... except dont most motards use tubes WITH tubeless tires?

[BLACK SQUIRREL]

The pressures are not based on the tube or the tire it is based in the power and weight of the machine and rider and how the tire reacts to that stuff (ie grip sidewall flex ect

[GixerJockey]

A tube fills all the available space between the rim and tire. Even if it didn't, any space in between isn't pressurized, so it wouldn't matter. When you inflate the tube, it pushes any ambient air out of the tire and fills that space with pressureized tube.


Bu to answer your original question. You only need worry about the pressure at the valve stem.

[xsiliconkid]

Correct ... except dont most motards use tubes WITH tubeless tires?

need tube if using spoked rim....as the rim is not air tight... unless it's a funky bmw with the spokes going to the outside of the rim....

[Pittenger5]

A tube fills all the available space between the rim and tire. Even if it didn't, any space in between isn't pressurized, so it wouldn't matter. When you inflate the tube, it pushes any ambient air out of the tire and fills that space with pressureized tube.

Gotcha. Makes sense.



(whats up with the parts)

[Kurlon]

My reading suggests that the tube's impact in tire pressure recommendations is based more on the tube adding thermal mass, therefore making the tire slower warming compared to the same setup run tubeless. So you tend to lower the pressures slightly to counter the extra thermal mass (and to a tiny extent, extra stiffness from the extra layer of rubber)?