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I had a nightmare setting up Schwalbe marathon supremes on mavic rims last week. I say I, I mean Jesse at micycle and I had a nightmare. He did most of the work. Got them on, inflated up with compressor with sealant in and then everywhere it was leaking pushed/ pulled the tyre back and forth in the direction of the axle.
Isn’t opposite the valve normally the first part of the tyre that goes on?
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Air the tyre, then hold the wheel, with the valve hole at the top and spin the wheel with the tyre pivoting between your palms, keep rotating it until you've been all the way round. If that doesn't sort it, leave it overnight for the jizz to go tacky, then it'll probably seal, provided it's on the beads.
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For me, pro ones were the easiest tires to set up. It may be that the tape is too wide and it's way up over the wall?
I'd try to put a tube and leave it there overnight to stretch the bead, sometimes the folds they have out of the box doesn't help.
If that doesn't work try slimmer tape? I used 20mm tesa in my 17mm inner China carbons, pro ones too, went up without sealant and with a normal pump -
Retapw with 21mm tape. 25mm is too wide for his rim. First inflate with soapy present (dilute) and see if the tyre seat and does not unseat when you remove the valve core. Then inject sealant then reinflate.
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@user20714
So, I'm having trouble setting up my first tubeless wheel from scratch (I have a pair that were set up for me on which I've changed the tyres without issue).
Kit is as follows:
I have done two wraps of tape, added sealant, and am trying to get the beads to seat. However hard I try one particular part of the bead (almost diametrically opposite to the valve) just won't stop leaking air. The closest I have gotten is about 30psi with little bubbles of sealant coming out. I've left it at this point but my current assumption is that it will continue to deflate.
Does anyone have any ideas to try? Having read up my thoughts are:
1) perhaps the tape is too wide and interfering with the bead. I've looked and can't see anything obvious, but is it an issue to use 25mm tape when DT Swiss note their inner rim width as 18mm? https://www.dtswiss.com/en/products/rims/road/performance/rr-411/
2) should I whack a tube in, leave for 24 hours, and try again?
3) is there something funny I've perhaps done with the bead when mounting the tyre? I used thumbs only (no levers), but the area it's not sealing is possibly the last bit of the bead that went on the rim
Typically I have been doing this on the same day that I got a whacking great hole in my cx tyres so it's tyre fun all night for me