I'm thinking that might be my last resort...Do you need to keep them?
I had this issue once - and I felt I had no choice but to cut them off!
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I'm hoping that once I've got these ones off, and I've removed the thick rim tape inside, then hopefully the rims will be usable with some Kevlar beaded tyres. No way will I put the same ones back on again. But then I guess there's more choice for bike tyres than for wheelchair ones?similar with my wheelchair tyres, it was a case of lots of time, swearing and screwdrivers and metal and snapping plastic levers, quality ones at that etc, strapping to compress they tyre and keep it in place (old clip straps work pretty well for that, or the quick clamp thingies for DIY.
Worst was then putting them back on with siilar effort and knowing i'd have to get them off again at some point.
I now have a fancy seating tyre lever thing, not tried it yet as not had the thrd puncure, fingerscrossed. Don't think they help getting it off.
If it comes to it, then I'll have to cut the tyre. But when I was deflating them I noticed a load of green slime coming out of the tube. I guess this is some kind of puncture protection. I don't want to end up cutting through the tube and making a right mess with the slime!Failing that hacksaw tread and cut beads from inside with wire cutters! As above.