Im trying to mount some tubeless tyres. They are pumping up to 120psi (road tyres) though max rated at 95psi no problem. Holding air for 5 mins without any sealant in yet. However when i delfate them, with the aim to take the valve out put some sealant in and reinflate, the bead falls back off the rim edge in to the well of the wheel. Tried soapy water around the tyre first too. Does this matter then? Should i just put in some sealant and inflate and not worry about it? or is there something else i should try to get it to pop on and hold?
Thanks
I’m no expert on road tubeless setups, but from mtb experience it might be worth looking at the amount of tubeless rim tape on there. In my experience taping too much can go up fine in the garage but be prone to issues when being ridden, specifically burping and slipping on the rim edge. Might not be that and happy to be corrected, but at those pressures I’d double check.
I set up some gravel tyres tubeless recently. They didn't "pop" either, instead they just let out a quiet little sound for several seconds much like the noise rice crispies make when you pour milk on.
That doesnt help you out at all, but thought i`d share it anyway. You are welcome.
So you got pop, but also snap and crackle?
Mine did the same and I thought it was a wheel / tyre combination thing ( roval slx24 and hutchinson ) but the same has happened with continental now. I don’t worry about it now and they have held pressure fine and go up with a regular track pump.
Cheers Owen. what do you mean by taping too much? does that mean that the tape is too close to the rim edge? to clarify the tyres are schwalbe "tubeless easy" ones, rims are mavic. The tape on there is up to about 1mm below the hooked part inside the rim.
Im not planing on riding at 95psi or 120psi more like 70psi, just trying to get bead to pop at the higher pressure. so the worst that can happen if i try it is some air loss maybe a bit of tyre slip on braking. I guess the sealant will limit slipping due to being like latex glue.
Oh ok thanks claudie yes i think i will just give it a go. Im amazed they hold air so well without any sealant at all.
I had the same with my boardman CX wheels. My guess is they are not proper tubeless rims and therefor lack the raised flat section for the bead to snap on to. Iv taken the view that this is OK because I will always be running high pressures in the road tyres it doesn't matter. For my mountain bikes where running low pressures is hugely beneficial in terms of grip and feel I will not use anything other than proper tubeless rims. the only issue with the road bike is if it goes down it will fall off the rim and require a tube to keep going
Yes, I think the issues I’ve had on occasion is where the tape is layered too thickly (like a double complete wrap of the rim) which means the tyre sits too high on the rim, or too wide and lapping up the sides of the rim - I’d guess you’d quickly spot if that were the case though.
Tubeless tape is supposed to go part way up the rim...
Try mounting the tyre with a tube first, then leave it for a couple of days.
Deflate.
Break one rim/bead seal.
Remove tube.
Fit valve.
Add sealant.
Refit tyre.
Pump.
What rims are you using? You said tubeless tyres but not tubeless rims? If they are not tubeless then they wont snap on. Is the tyre wobbly when you spin the wheel? If not the beads are seated as well as they are ever going to.
I mounted some Maxxis HR2 tyres to a pair of Halo Vapour 35 wheels which come set up for tubeless and they had no pop at all.
Still going strong months later and no slow pressure loss.
New tyres have gone up ok without wobble. I should have probably gone with the innertube idea first but couldnt wait. Right they are not tubeless rims.
One other thing is do you have to constantly replace valve cores? Seems like the ones ive just fitted have sealed themselves up after about 3 hours with sealant inside and air is no longer freely going in to the tyre.I did remove the cores to inject the sealant by the way. They are schraeder valves .
Some pop, some don't, it's not important.
^^ What he said ^^
What is important is that there should be a line moulded into the sidewall a couple of mm above the rim. As long as this gap is equal all the way round then it's sat right. If the line disappears under the rim at any point then it's not right. If not, I'd try unseating all the way round, re-lube the bead with soapy water and try again.
Yeah, my cheapy tubeless Alexrims actually work really well with all the tyres I've put on them but they have never really gone "pop" ever. It's not caused any problems so I don't worry about it.