Anyone using PU tub...
 

  You don't need to be an 'investor' to invest in Singletrack: 6 days left: 95% of target - Find out more

Anyone using PU tubes with sealant?

6 Posts
5 Users
3 Reactions
647 Views
Posts: 0
Free Member
Topic starter
 

Looking at this for a mess free solution as I need to change tyres regularly and wondering if anyone can advise if it works?


 
Posted : 03/04/2023 7:24 pm
Posts: 0
Free Member
Topic starter
 

To clarify... Almost like a slime tube (sealant in the tubilito etc)


 
Posted : 03/04/2023 7:44 pm
zerocool reacted
 ton
Posts: 24124
Full Member
 

i use tubeless solution in standard tubes. works fine.


 
Posted : 03/04/2023 7:59 pm
supernova reacted
Posts: 6235
Full Member
 

Now this is just my experience, and only a small sample, but I've had tubes degrade and pop after being used in tyres that have had sealant in.

Twice - about 5 years apart - I put a tube in tyres where sealant wouldn't seal a puncture. On those 2 occasions the inner tubes both deflated a couple of days later. Both looked like the sealant had affected and degraded the rubber in some way.

I don't know whether what's in the sealant is corrosive to the tube rubber, but it was odd that it happened twice.

Of course I expect that lots have people have put sealant in tubes and it's fine. But YMMV!


 
Posted : 03/04/2023 8:17 pm
Posts: 0
Free Member
Topic starter
 

I'm talking about TPU tubes not standard inner tubes.


 
Posted : 03/04/2023 9:01 pm
Posts: 8612
Full Member
 

Will there be some issue with the sealant not binding to the TPU?


 
Posted : 04/04/2023 8:02 am
zerocool reacted
Posts: 41642
Free Member
 

Will there be some issue with the sealant not binding to the TPU?

Latex works by congealing under shear forces (a bit like how you can run over custard as long as you don't stop, but the effect is permeant). So it could still work, might make an interesting experiment. Having said that, Slime sealant is a different kind of goop, designed to run inside tubes?

But either way, you won't get the protection from pinch flats as that comes from eliminating the tube in the first place. And if you don't get the benefits of being able to run lower pressures, lower rolling resistance, more supple casing/grip, etc then is it worth using a sealant just to protect against thorns?

I just run all-round tyres on my MTB's these days, and if I know I'll be swapping frequently (more so on the gravel/commuter bikes) I'll just throw a tube in.


 
Posted : 04/04/2023 4:05 pm

6 DAYS LEFT
We are currently at 95% of our target!