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@MrBig-G
The H+Son rims are hook edge rims and the Stelvios are hook beaded clinchers...with a top rated pressure of 145 PSI. I inflate to about 80 PSI so the inward pressure of the tubes exerted on the rims shouldnt cause a section of the tyre to slip off and bulge.
However i did an experiment, and the old tyres bulged at 120 PSI, with the tube showing between the bead and the rim, and the new ones didnt. Not sure what this means but there seemed to be an integral weakness with the old tyre.
Perhaps I need a non folding clinchers with wire...although my rims are hook beaded?