New tubeless tire won't hold air

[bigbill]

Originally Posted by C40_guy

After adding the sealant, I gave each wheel a pretty vigorous couple of spins. Noted that it might take more than that...

Nicely, these tires seat really nicely and are probably easy to remove...



No tape needed on these wheels.



Hmmm. Rear wheel holding air fine with no tape.



I suspect the valve core on the front wheel...it's just slightly bent. I'm going to swap out valve cores. If that doesn't solve the problem, I'll do the bubble test.



If *that* doesn't show anything useful, I'll add tape.

The only thing I'll add about setting up tubeless, I use soapy water to seat the tire. I let it sit for a while inflated and the bead will typically bubble. I deflate, remove the core, and add sealant. After I reinflate the tire, I spin it, bounce it like a basketball, and hold it sideways while shaking it. I'll put more soapy water on the bead and watch for bubbles. Then I ride it. I had a WTB Riddler that leaked through the sidewall once, that was tough to diagnose until enough sealant oozed out to notice.

[caneye]

OP - did you get to the bottom of this?

You didn't mention the sealant brand.

i had a similar issue with a pair of Panaracer Agilest tubeless-ready tyres + Joe's sealant. Came to a point where I would lose 20psi within one day. No sealant leaks anywhere though.
I slowly dunked the wheel in a basin of water and could see bubbles seaping out from the tyre wall as if it was porous.
Topped up the sealant but it did not make any difference.

I couldn't be bothered trouble-shooting further (life got in the way).
Switched over to GP5K STR + Orange sealant and it's been running flawlessly.

[C40_guy]

Originally Posted by caneye

OP - did you get to the bottom of this?

You didn't mention the sealant brand.

Haven't had a chance to play with it yet, will spend some time on Friday. First step is to replace the valve core. Then see if it holds air, and do the bubble test.

If still no, I'll remove the tire and start over, after inspecting wheel and tire.

I've been using Orange sealant for about a year.

One interesting twist...when I first added sealant I was at the end of a 16 oz bottle of sealant. I mostly got foam rather than liquid. Tire went flat (d'oh!). I added another 2 oz from a fresh bottle...and used the same on the rear tire, which has held air properly.