Anybody seen "sweating" on tubeless tyres?

[Globalti]

There's an interesting discussion going on on Singletrack about this, they are mostly mountain bikers so I thought I'd nip over here and ask if anybody with road tyres filled with latex has noticed sweating on the tyres.

Opinion is divided between water from the latex solution and oil used as an improver for the rubber.

??

 

[dan_bo]

Oil feels oily. Water feels watery.

 

[Racing roadkill]

That's a common problem with tubeless tyres. It's a type of osmosis, the water from the latex solution passes through the tyres by osmosis.

 

[Globalti]

But people on STW report that it's an oily liquid that doesn't evaporate.

If it was water, it would be passing through the molecular structure of the rubber in the same way that air escapes slowly. This is not osmosis; osmosis is a process of molecular migration through a permeable barrier into a solution of greater concentration.

 

[fossyant]

Read the same thread. I've not gone tubeless yet.

 

[Racing roadkill]

But people on STW report that it's an oily liquid that doesn't evaporate.

If it was water, it would be passing through the molecular structure of the rubber in the same way that air escapes slowly. This is not osmosis; osmosis is a process of molecular migration through a permeable barrier into a solution of greater concentration.

Yeah thanks for the science lesson ( not ) it's reverse osmosis.

 

[Jody]

But people on STW report that it's an oily liquid that doesn't evaporate.

If it was water, it would be passing through the molecular structure of the rubber in the same way that air escapes slowly. This is not osmosis; osmosis is a process of molecular migration through a permeable barrier into a solution of greater concentration.

Yes it is an oily substance that doesnt dry, so part of the stans fluid. Happens on my nobby nics where after a year is start developing wet patches on the sidewalls and in between the tread. This doesn't correspond to where the tyre has been punctured. When I posted it up on STW and from what I can gather from looking up online it seems to be limited to a vertain few manufacturers. I was told its not an issue and keep riding them.

Looks like this after the bike has been stood

 

[Jody]

I can take some pics of mine tonight if needed. They still look and feel wet

 

[mythste]

That's a common problem with tubeless tyres. It's a type of osmosis, the water from the latex solution passes through the tyres by osmosis.

Curious. On the grounds that what's happening sounds nothing like my (admittedly limited) knowledge of osmosis!

Whats the science out of curiosity?

 

[lpretro1]

Have only has this when fitting a new tubeless tyre - it occurs when the tubeless fluid seals all the minute holes in the walls of the tyres - wipe it away and it stops after a few hours once everything has sealed up

 

[Globalti]

Curious. On the grounds that what's happening sounds nothing like my (admittedly limited) knowledge of osmosis!

Whats the science out of curiosity?

It's just seepage, nothing to do with osmosis.

This is osmosis: https://en.wikipedia.org/wiki/Osmosis

 

[tincaman]

I am a new user of tubeless, and I have just noticed some wet patches on my Schwalbe S-ones's, I did wonder about it, thought I might have got some oil on them. I use a mixture of latex and water as sealant

 

[nickyboy]

It's just seepage, nothing to do with osmosis.

This is osmosis: https://en.wikipedia.org/wiki/Osmosis

Correctimundo....seepage due to pressure differentials. Nowt to do with osmosis, reverse or otherwise

 

[Pale Rider]

The tyre is not designed to be air tight, it doesn't have to be because it's designed to be used with an inner tube.

Which makes a tubeless conversion something of a bodge, although I suppose a bit of seepage is relatively harmless.

 

[Levo-Lon]

People on STW like to argue..just like here..its a tyre full of sealer..it seals..
you can't see air leaking unless you ride underwater..sealer is easy to see..simples..


had a stupid argument on there about brake fluid and water absorption .some people know more than scientist's. .its very funny at times