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More pressure until they jump to place. Always found these a bit baggy but for really tight fittings I always squirt some soapy water or alcohol in the unseated part, pump to unreasonable PSI. Repeat as many times as necessary, but don't leave your gravel tires pumped at 100 PSI, release as soon as it seats.
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Well I was just seating mine and making sure they were all seated and was on the way up to 100 PSI and there was an almighty bang and the tyre blew off the rim. My ear rang quite a lot. But the tyres fine. So I wouldn't even go up to 100, never mind leaving them on.
I actually used one of those garden weed sprayers, put a bit of pipe over the end and on to the valve, pumped it up, released the pressure and it seated.
Got a set of WTB Riddlers and for the life of me I can't get them seated right (must have had the tyres off at least half a dozen times). They're fine offroad but as soon as I'm on tarmac the bump-bump-bump feeling pisses me off. Never had the problem before; any tips?