May 3May 3 I have a recurring issue with the rear (tubed) tyre becoming partially unseated. There's no problem with getting it to seat initially - a bit of lube, inflate it to 60 or 70 psi and it pops on nicely, all the way around. The problem occurs after I deflate it to my normal pressure (4 psi) and ride it. A section of the bead slips off its seat, about 250mm in length. I can reseat it easily but when I deflate it back to riding pressure and ride the bike it happens again. The rim looks fine, as does the tyre itself - both are fairly new. Suggestions? Superglue and self-tapping screws?
May 3May 3 I had that issue with a vintage bike. It looked like it unseated in the area of the rim weld. The weld did not look that bad but I took a file and smoothed it out as much as I could. That eliminated the issue.
May 4May 4 Add another rim lock right where the tire pops off the rim bead, if the rim actually has a bead. Guessing it is a steel rim with no bead, guessing you are running a tubed type tire on it. In my experience there is only one adhesive to safely use in tire applications and that is Fish glue. The up side of Fish glue is it's non-flammable and water soluble and re usable, the down side of Fish glue for your application is that it's water soluble. Fish glue is a fast drying, cold set, highly flexible adhesive largely used in woodworking.
May 5May 5 Sounds like a tube type rim with a tubeless type tyre. The sealing beads on a tubeless tyre have nothing to hold them onto the bead seats of a tube type rim and their shape actively pushes the bead off the bead seat. There are lots of options if this is your situation. Tubeless rim Tubliss device Tube type tyre Reshape the beads on your tubeless tyre
May 5May 5 Author 24 minutes ago, feetupfun said: Sounds like a tube type rim with a tubeless type tyre. The sealing beads on a tubeless tyre have nothing to hold them onto the bead seats of a tube type rim and their shape actively pushes the bead off the bead seat. There are lots of options if this is your situation. Tubeless rim Tubliss device Tube type tyre Reshape the beads on your tubeless tyre Interesting, thank you. So it's possible to grind the beads to a different shape? I assume that means flattening its inside diameter?
May 6May 6 9 hours ago, oldjohnno said: Interesting, thank you. So it's possible to grind the beads to a different shape? I assume that means flattening its inside diameter? Yes, flattening the ID. I also increase the ID slightly
May 6May 6 Author 2 hours ago, feetupfun said: Yes, flattening the ID. I also increase the ID slightly Sounds like it would do the trick, I'll give it a try - thank you!
May 6May 6 13 hours ago, oldjohnno said: Interesting, thank you. So it's possible to grind the beads to a different shape? I assume that means flattening its inside diameter? It's also possible to re-lace the wheel with the correct type of rim 🤓 I give that solution about 100% more likely to work.
May 6May 6 Author 10 hours ago, lemur said: It's also possible to re-lace the wheel with the correct type of rim 🤓 I give that solution about 100% more likely to work. I have a spare tube type rim I can use, a better long-term solution for sure.
May 24May 24 Author I lightly touched up the bead ID as per feetupfun's suggestion, and used self tapping screws instead of rimlocks. After several rides it's still firmly in place 😄. When this tyre wears out I'll replace the rim with a tubeless type; I imagine the options for tubed tyres will dwindle even more in the future. Thanks for everyones help!
May 30May 30 On 5/9/2026 at 11:05 AM, teamferret said: IRC still do tubed type tyres with exelent grip Yes, when you can get them!
June 2Jun 2 On 5/30/2026 at 6:55 PM, stpauls said: Yes, when you can get them! They haven't been available in Australia for many years.
June 2Jun 2 On 5/24/2026 at 2:50 PM, oldjohnno said: I lightly touched up the bead ID as per feetupfun's suggestion, and used self tapping screws instead of rimlocks. After several rides it's still firmly in place 😄. When this tyre wears out I'll replace the rim with a tubeless type; I imagine the options for tubed tyres will dwindle even more in the future. Thanks for everyones help! I suggest that if you fit a tubeless rear rim and it's a drum brake wheel, use the rim type that has a sealing band in the central well, rather than a flanged type tubeless rim. It will be a lot less work/cost to fit.
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