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I also tried overinflating the tube to about 90psi (tyre rated max 60psi) which helped a little but I didn't have the guts to keep pumping
I had a Conti UltraSport HomeTrainer once which had the same problem, yea even unto tthe 160psi at which I got bored with trying. Having got two other samples to seat up easily on the same rim, I put it down to an out of tolerance tyre and freecycled it to another forumenger, who either had a smaller rim or just didn't want to look a gift horse in the mouth as I've heard no more about it.
Check the rated pressure of the rim with that tyre size, and have fun pumping up to double that, which any tyre/rim in new condition should pass as a static test. Wear eye and ear protection and be prepared to explain yourself to the neighbours if the opposite side lifts over the rim before the stuck side lifts onto the bead shelf :)
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gbj_tester
I am having a hell of a time trying to get a tyre to seat straight - not something I've struggled with before. After about 3 hours yesterday of lubricating, inflating, deflating, pulling, pushing, swearing etc - I'm stumped. I also tried overinflating the tube to about 90psi (tyre rated max 60psi) which helped a little but I didn't have the guts to keep pumping.
There's about a 3 inch section on one side which stays tucked in to the rim. The only other solution I can think of is changing the width of the rim tape. Or burning the fucking thing.
Tyres are WTB Resolute 700x42 and the wheels Alex CDX4, for what it's worth.