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Maybe this is common knowledge, but it was new to me, and I found it on a motocross site so thought I would try to save people some suffering.
Yesterday was trying to seat 27.5x3.0 tyres on wide rims (CST BFT on fatlab 40mm internal) - I tried everything short of a trip to the petrol station compressor: seated it with a tube, soapy water, used a tubeless booster pumped up with so much air it exploded my cheap track pump, co2, and nowt worked.
This evening, following the motocross advice, I strapped the tyre reasonably tight to the rim all the way around the middle with a strap (just a cheap one with a tiny sprung clasp, nothing hardcore) - not crazy tight, just enough to compress the middle of the tyre a bit and push the bead out, and I guess also reduce the volume some. Hit it with the booster - popped on first time. Then let some air out and removed the strap, before pumping back up. Worked with and without sealant in the tyre.
Saved me significant time/swearing/sweating on the track pump (would have saved me more if I found it yesterday...) - hope it saves somebody else's time too! I can't find much in the way of examples, but the principle is the same as this vid of someone doing it to a small tractor!
i turn the tyres inside out for a couple of days . It pushes the bead on the outside .