[Closed] Toobless Noob question

Yes mate. Put your sealant in blow tyre up and spin the wheel.

Worth checking if there are any holes in the rim either side of the join.

Don't forget the glitter

Yep, whack some sealant in and give it a shake. It might be worth adding a little extra tape over the rim joint, but I'd expect the sealant to sort it anyway. Worth bearing in mind that air escaping from the valve hole and rim joint doesn't mean that that's where it's getting past the rim bed: the rim is hollow, and nipples do a pretty decent job of sealing the spoke holes.

Thanks guys. I put a little extra tape across the rim joint, wall to wall. Added some sealant and re-inflated. Quick slosh and the leak from the valve stopped almost immediately with no sealant visible. Small amount of sealant visible from the rim joint (partially obscured by the stickers). Gave it a good slosh about and this appears to have sealed now with no noticeable air coming out. Will leave it at 30psi overnight and see how it is tomorrow.

I wasn't really expecting the rim joint to be a problem, is this normal?

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Oh, what colour glitter for 650b Shorty?

Red obvs, and it wasn't a joke.

http://reviews.mtbr.com/does-adding-glitter-to-tire-sealant-really-work

As to the rim joint, if it's a pinned rim rather than welded then it's to be expected. You want to encourage the sealant into the gap by sloshing it around a bit, but based on that pic it looks ok already.

The rim joint shouldn't matter and it should positively, definitively not leak.
The two sealing surfaces are the rim tape and the tire, at the "middle" of the tire well, not on the sides. My suggestion would be thicker tape (or an extra wrap).

L.E: If the rim is 25mm internal, 25mm tape clearly won't cut it if installed centered. The tape must fill the center well and reach the flat sides of the rim in order to seal correctly:
[img] [/img]

Hmm so conflicting advice.

Sloshed it about last night and left it at 30 psi. This morning it's at 28psi and no more sealant coming out.

I am wondering if I might now have more sealant in the rim than the tyre and if I should start again re-taping but making sure I get the tape right to the edges of the rim, as per otsdr's picture

30 to 28 overnight is not a bad result, especially if you haven't even ridden it yet (?). I normally expect to lose about 1psi in 24 hours just in normal use.

If you're curious about sealant levels, unseat a small section of bead and have a look.

Unless the tyre is going flat overnight, or there is an obvious leak which won't seal, I would just be riding it and topping it up where necessary.

30 to 28 overnight is not a bad result, especially if you haven't even ridden it yet (?). I normally expect to lose about 1 psi in 24 hours just in normal use.

I am about to go tubeless (first timer) on my FS, which may often sit in my garage for a fortnight between rides, especially in winter. Does this mean I will be having almost flat tyres before many rides ?

Does this mean I will be having almost flat tyres before many rides ?

I doubt it. I don't tend to leave it that long between rides, but occasionally need to top it up a few psi here and there. Even inner tubes will lose some pressure over time.

For a first overnighter, 30->28 psi is good going. Take it for a couple of rides to really get the sealant sloshed around and those last few little air escapes will seal up. It's normal for the sealant to take up some gaps on the first ride or two.

I've a set of tubeless wheels, unused since August. The rear is still at what it was, the front has lost circa 10psi.

Does this mean I will be having almost flat tyres before many rides ?

Depends how good a job you do of setting them up tubeless!

They won't be flat after a fortnight if done correctly but they probably will need topped up

If the rim is 25mm internal, 25mm tape clearly won't cut it if installed centered. The tape must fill the center well and reach the flat sides of the rim in order to seal correctly

Actually, I'm not sure why it's important to get the rim tape right to the edges, as long as the spoke holes are properly covered. Obviously if you don't there's a risk of leaking at the joint (if it's pinned) but nowhere else on the rim.

The only possible issue I can see is with the bead catching the edge of the tape when you unseat it, but I've not had this problem using a single wrap of tesa tape, even with really tight tyres.

The bead should sit [b]on[/b] the tape, if it goes outside the air will go under and out the whatever hole it can find.

I had the same problem with my xx27 rims, fixed with wider tape.

Checked on superstar website and it's a pinned rim not welded so as bit of seepage at the joint isn't unlikely but it should seal fine. As above 30-28 psi overnight when first set up is pretty good. Go ride it!

Like the glitter idea!

I remember seeing a tubeless video/setup sequence that recommended using tape that was the external width of the rim. The reason being that when the tape was pressed down into the rim profile it would "pull in" to the correct point just inboard of the bead channel.

As for pressure drop overnight/after a week: I've found this fairly common with *some* setups. As mentioned above a few rides to get the sealant everywhere sorts this out. If you leave the bike for a long while then pressure will drop but then even with tubes you'd check before going for a ride.

Well the tyre is still up. I've not had chance to ride it yet, and won't before the weekend. I fully expected to lose a few psi, at least initially.

I appreciate the point about wider taping and the tyre sealing on top of the tape, makes sense.

As the tyre is staying up and there sounds like plenty of sealant sloshing around in the tyre I think I'll run it as in for now. If I have any problem the will re-tape wider.

Thanks all for input.