Getting a tyre to seat properly?

ishaw

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So, I've had a day of bike repair. First up my son's mate snaps a cable on his disc brakes, brings it over and I'm fixing that, plus I noticed the rear cable is dodgy and also fouling the discs, fix that too. Then I noticed the horrible rocking from a loose headset, another fix. Add some blingy purple cable ends, just because I could and matched the grips. Off they go back to the track.

An hour or so later I get a call from my son, he thinks he's wrecked his bike, mashed the rear mech and broken chain. I feared the worst and went to collect him, turns out it's just the chain has snapped, well the joining link decided to un join as he landed a jump. Lucky he didn't hurt himself.

I was always a bit dubious about whether the chain was a legit Shimano one, I guess now I know, it's in the bin.

New chain from the stash fitted, re+indexed the gears, noticed rear wheel was out, qr loose so another fix done, then I'm asked if I can fit wider tyres. 2.1s not enough for a 12 year old it seems.

Had some new magic Mary tyres in the garage so thought why not, fitted them but they didn't seat well, that thing where some of the bead just doesn't pop into place.

Took them off, lubed the tyre edges and rims with washing up liquid (fairy, only the best) and tried again. Still they wouldn't seat, even after filling them to 60 psi, no satisfying pop as you usually hear when pressure wins and the jump into place.

So, how do I get these tyres to seat right?
 

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