Mountain Bike Reviews Forum banner
1 - 20 of 21 Posts

·
Registered
Joined
·
658 Posts
Discussion Starter · #1 ·
Is there a secret to getting sealant to the bead w/ a Tannus tubeless insert? My rim/tire hold air perfectly without the insert, but will only last a day tops when the insert is in. I have swapped back and forth to verify this. I have the hole lined up properly with the valve stem to allow sealant through to the tire itself and have done the usual tubeless shake/spin/wiggle after the install but it keeps leaking at the bead, even after a few rides. Even tried adding extra sealant for extra sloshing. The FAQ on their website was kinda useless. Kind of at a loss on the next steps.
 

·
Registered
Joined
·
99 Posts
I have this problem on 3 different 2.4 wheels with install a month ago, I was worried I messed up the tape somehow with my seating the insert. I may not use them, idk. Maybe I need to get the sealant between the insert and the tire and not in the insert and massage insert in a bit around the rim laying side to side once seated, but no pressure.
 

·
Premium Member
Joined
·
578 Posts
Is there a secret to getting sealant to the bead w/ a Tannus tubeless insert? My rim/tire hold air perfectly without the insert, but will only last a day tops when the insert is in. I have swapped back and forth to verify this. I have the hole lined up properly with the valve stem to allow sealant through to the tire itself and have done the usual tubeless shake/spin/wiggle after the install but it keeps leaking at the bead, even after a few rides. Even tried adding extra sealant for extra sloshing. The FAQ on their website was kinda useless. Kind of at a loss on the next steps.
Sometimes that's not enough. I've experienced this with road bike tires as well as MTB tires (with or without inserts). I have Tannus inserts and I think I may have had this problem once after swapping out tires, went for a ride and that sussed it out. If you haven't already, try taking it out for a short ride and see what happens.
 

·
Registered
Joined
·
674 Posts
If that were the case, switching back to the tire by itself wouldn't hold. It's had air in it for a week and is still firm. Hence why I'm at a loss.
I'm convinced this is just a weakness of the Tannus design. I've been using them as well and it always takes like 10 rides to fully seal. Typically it leaks from the valve stem for me, it helps to pour the sealant directly into the insert and not the tire. The design doesn't allow sealant to move that freely inside the insert.
 

·
Registered
Joined
·
658 Posts
Discussion Starter · #11 ·
Right. I was assuming the sealant on the outside of the insert could work it's way to the bead, but looking closer at the little diagram they show, maybe it's the other way around. I was only giving it 3-4 rides to seal, maybe I just need to give it longer, or let it sit on its side overnight, something like that.

1942929
 

·
Registered
Joined
·
3,108 Posts
I'm convinced this is just a weakness of the Tannus design. I've been using them as well and it always takes like 10 rides to fully seal. Typically it leaks from the valve stem for me, it helps to pour the sealant directly into the insert and not the tire. The design doesn't allow sealant to move that freely inside the insert.
It's not just tannus. I've had similar issues with vitoria airliner and it doesn't snug up to the bead as aggressively. I've had to add nearly double the amount of sealant I would use for straight tubeless or with procore to get adequate sealant circulation. Sometimes it takes a few rides to really set the tire up even with tons of goop. It's beyond annoying. I personally hate the thing and only use it to rotate a front exo to the back to get the last bit of life out of it.

It's not hard to see how any of the foam options that snug against the sidewall but don't aggressively lock it in are going to cause sealant circulation issues. Procore was nice in that you didn't need sealant to reach the bead/stem, but it has other issues like chronic valve clogging.
 

·
Registered
Joined
·
658 Posts
Discussion Starter · #13 ·
Well after shattering a carbon rim earlier this year, I'm pretty set on running one in the rear.

I might take chronic valve clogging over airing up my tire from flat every damn ride. At least with a clogged valve you can usually just blow/push through it with the pump (or at least what I've experienced so far).
 

·
Registered
Joined
·
750 Posts
Simple fix
Deflate the tire, pinch the insert away from the bead, spin/shake the wheel then re-inflate and repeat.
With the tire inflated the foam insert shrinks and gets pressed tightly against the beads which is blocking sealant from getting to the bead.
 

·
Registered
Joined
·
658 Posts
Discussion Starter · #16 ·
Hm. What about smearing sealant all around the bead right at installation, kind of like you can do with a valve? Would probably work with a thicker/goopy sealant, maybe not some of the thinner ones.
 

·
Registered
Joined
·
3 Posts
Went through a few more inflate/ride/reinflate cycles and appear to have finally got the tires to "set." I was wary of running them on 0 psi, so I ran them at about 12 last night and noticed that the rear tire held air until the next day and the front did not. Rode another 8 miles at 8 PSI today and it looks like the front is now going to hold. I agree that the tire probably has to flatten out enough for sealant to get past the sidewall edge of the Tannus insert.
 

·
Registered
Joined
·
992 Posts
What you're possibly noticing, is that pressure is directly related to volume. What you could be seeing is exactly the same rate of air leakage, but the significantly reduced air volume inside the carcase (due to the volume occupied by the insert) is making itself noticed as an apparent increase.
 
1 - 20 of 21 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top