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No experience with those specific tires, but as a general rule, here are a few things to check :
-is the rim worn in any way (dented or very worn in case of a rim brake model)- is the inside clean (no debris on the rim bed, no old sealant, etc.)
- is the rim tape ok? (no wrinkles, well centered)
- try seat them with soapy water, "massage" them in place (it helps to identify which part doesn't sit right), then pump to max recommanded pressure.
- is the inside clean (no debris on the rim bed, no old sealant, etc.)
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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.
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?