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@neilbah
700c is only a 'sort of' standard with small variations of erto 622mm rim bead and tyre bead sizes meaning some tyres go on certain rims well but are difficult to fit on others. Are the tyres wired or folding bead? are they new or have previously been levered? Navigator pista are narrow rims but i found wired vittorias a little hard to seat fully and that wasnt the case with contis. Likewise i recently had a customer with basic alloy wheels from a giant which were about 2mm smaller in diameter to another rim placed next to it. Consequently every tyre we tried just blew straight off the rim until we tried folding bead Ultra sport 3s.