Seems to lose no noticeable pressure for maybe a week, then I find it completely flat
It’s a newly fitted schwalbe g one
Any ideas what may cause this?
Thanks
its losing air.
fill a bath or sink with water and put the wheel+tyre in the water. check for bubbles
As the pressure gradually drops, I reckon the tyre will sit on the rim "shelf" and seem normal but then eventually the pressure will get so low that it won't stay on the rim properly, will break the seal and all remaining air will go
As said, it's leaking
I had that, continued for a couple of weeks, fine, fine, fine, fine, pancake, pump up, repeat, most confusing/exasperating. Anyway, walking past the garage one day heard an incredible hissing/spraying, immediate panic as I thought the water hose had split again - nope stans everywhere. I think that in the heat the pressure went up enough to force the puncture hole open and this time it was at the bottom of the wheel. So maybe pump it to silly pressure and see if it gives
Does your rim tape need replacing. I had a similar issue. Tyre had been fine for days, but it in the car and 1/2 hour later was completely flat. Turns out the rim tape had decided it was time to come unstuck.
Any ideas what may cause this?
You're using Stan's sealant in a road tyre.
Try Orange Seal instead.
(Stan's is great for MTB, but would not seal reliably at > ~~40 PSI for me. It would seem to hold for days and then lose pressure randomly. Orange Seal didn't.)
elves
it's 2.25 29'er g-one allround tyre. Other wheel is staying up fine.
I'll check the rim tape, although if it was leaking not sure why it pumps up again?!
You don’t say what wheel you are using.If the rim is tubeless compatible only then I have found that the tyre can come away from the rim as it deflates.Where the rim is a genuinely tubeless profile then the tyre will stick to the rim even with no air in the tyre.
I had something like this with a Specialized Ground Control on a tubeless rim recently.In this case a piece of irregularly shaped flint lodged in the tyre carcass caused a puncture and allowed air to pass either side.Once removed the sealant could do its job and the tyre stayed up.