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Make sure the tyre is sitting over the valve core. Push the tyre down on to the rim with your palm over the valve core when you open the air shot.
If the tyre is tight enough on the tape it will go up - I find that when they are tight the tyre tends to straddle the valve core so half the air just blasts out and up the side of the tyre from the valve. Worth taking a time with a tyre leaver to make sure it’s sitting over the core.
Howard
andyfallsoff
HarmanMogul
Fucking fuck, fucking fucking fuck.
Read the first post (over and over) - but I still find every time I try and seal tubeless tyres, I can never get the bloody things to seal, even using an airshot. It always seems that the valve core pushes the tyre beads out near the valve but the tightness of the tyre pushes it into the centre of the rim around the rest, and air escapes out the sides.
Every fucking time.
Anyone else find they don't understand why they can't make it work reliably?