Sealent leakage???

[gelfy666]

Is it normal for sealent to leak out of a tyre? Well on the top of the tyre to be accurate. Bike hasn't moved for 2 days and now I've a wet patch for no apparent reason. Confused.

 

[KnackeredBike]

I have seen references to tyres "sweating" quite a bit on here. I would imagine it's caused by the release solvent they use to remove the tyre from the mould, although I could be wrong, as some tyre instructions advise cleaning the inside of a tyre with alcohol before running tubeless.

 

[Jody]

Yes and it happens all the time. Some brands are worse for it than others.

https://www.cyclechat.net/threads/anybody-seen-sweating-on-tubeless-tyres.213916/

 

[gelfy666]

thank you.............. just seemed odd that it was on the top of the tyre.

 

[Racing roadkill]

It seems to be that the surfactant used as a wetting agent in the sealant is migrating across the membrane ( tyre ). Some sealants have different concentrations of surfactant in them, some membranes ( tyres ) are more porous, to the surfactant than others, or a combination of the two factors.

 

[gelfy666]

Ahhhh just changed my sealent brand, so that may explain it .

 

[screenman]

Maybe there is a hole in the tyre.

 

[User482]

Is it normal for sealent to leak out of a tyre? Well on the top of the tyre to be accurate. Bike hasn't moved for 2 days and now I've a wet patch for no apparent reason. Confused. View attachment 374328

I had the same recently on my road tyre, once it had become quite badly worn (which may or may not be related). Upon removing the tyre, I found quite a lot of dried sealant on the inside of the damp area. No puncture holes. @Racing roadkill seems to have a good explanation.

Anyway: new tyre and new sealant, no damp patch.

 

[Flyboy]

I have a strange one , just tried to let air out my tyre , not a chance . It will take air I just can't release it . All I can think is that my sealant has formed a flap on the inside of my valve . It's on both wheels don't ya know.

 

[Milkfloat]

I have a strange one , just tried to let air out my tyre , not a chance . It will take air I just can't release it . All I can think is that my sealant has formed a flap on the inside of my valve . It's on both wheels don't ya know.

Sealant will often gum up the valves, assuming your are removable value, take it out and clean it.

 

[Flyboy]

I could only take the inner out , as being tubeless I would have to take my tyre off to remove the complete valve.

 

[Milkfloat]

I could only take the inner out , as being tubeless I would have to take my tyre off to remove the complete valve.

That was what I meant, now it is out surely you can poke enough to let the air out so you can deflate and clean out the dried sealant?

 

[Flyboy]

I will have a go tomorrow , using the bike in the morning . Thanks for your help