One very good trick to help your tyres stay on the rims is to use two rim tapes - this makes it much more difficult for the bead of the tyre to sink into the well of the rim at one place which then allows another part of the tyre to pop off the rim. You can also build up the thickness of your existing rim tape with insulation tape. This trick works time and time again and was the only way to get the tyres to stay on the rims of my Kingcycle when the tyres were inflated to 90psi...
One very good trick to help your tyres stay on the rims is to use two rim tapes - this makes it much more difficult for the bead of the tyre to sink into the well of the rim at one place which then allows another part of the tyre to pop off the rim. You can also build up the thickness of your existing rim tape with insulation tape. This trick works time and time again and was the only way to get the tyres to stay on the rims of my Kingcycle when the tyres were inflated to 90psi...