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I recently removed a winter tyre from my rear wheel and replaced it with something more summery. The summery tyre had been used last summer without issue but this time around it's been leaking from between the bead and the rim ever since I fitted it. Today I attempted to reseat it and instead blew out the bead at 62psi...
As a stop-gap, I refitted the old tyre which had also been fine last time it was used but it too is leaking from between the bead and the rim.
Anyone got any clue as to what is going on?
Having only done 4 tyres I’m certainly no expert, but I think that the big bottle of Stans I used (now with a friend so I can’t check it) said not to exceed 40PSI.
Edit: here it is…
The thread below also seems to say that high pressures can blow off the rim?
https://singletrackmag.com/forum/topic/stans-rim-pressure-warnings/
62psi for a 25mm road tyre should be fine.
For a 2.8" 29er MTB tyre it would be amazing it held that high.
It needed over 90psi to seat the winter tyre today...
Bit of soapy water/Schwalbe easy fit juice around the bead might help....
Have you thoroughly cleaned any dried snotty bits of sealant from the rim and the tyre where it seats?
@doomanic What tyres and rims are you playing with?
For the pressures stated, I presume they are skinny road tyres.
As said above, you need to remove most of the old sealant from wheel and tyre, especially around the bead area on both.
And when you say it needed 90psi+ to seat the tyre - what was happening before it sat properly?
If it was just blowing air out then it points to the old sealant not being removed sufficiently.
If it was holding air and not coming up into the bead, that suggests you need some assistance from wet rims.
35mm Mondraker asymetric rims. 2.6 eWild (summer) and 2.8 MM (winter)
The rim bed is very flat and the tyres are pretty much the same size as the rime bed so it's very hard to get the tyre bead close to the rim.
To get the tyre to seat I use a compressor that maxes out at 7bar with a decent sized reservoir. That is usually enough, even with dry tyres and rime but this time round I had to wet the bead. This highlighted just how badly the bead is leaking. When the bead seats it goes on with a decently load pop or two. I got this pop with both tyres but that are both leaking in the same manner.
Eek, that much pressure into rims and tyres that wide, I'm surprised they didn't explode - if it had sealed it probably would have.
Have you tried a wide ratchet strap or similar tightened up around the tyre whilst inflating? I did this when seating 2.8" Nobby Nics on ARC 40 rims and they went up first go.
Basically the strap was about 1 1/2" wide and forced the outer edges of the tyre towards the bead whilst not letting it balloon up when trying to inflate. Don't have it so tight the air can't get in of course, and I assume you are taking the valve core out and it isn't narrowed by old sealant?