Bruce,
It is surprising how many cyclists don't know how to mount a tube. It is easy:
First seat the tire on the rim on one side only. Fill tube with air so it has shape and is completely round.
Put tube onto rim, starting at the valve, work it evenly into the rim and tire.
Push the open side of the tire flat to the side of the rim. The tube should be evenly distributed around the rim and not sticking out anywhere. The bead of the tire should now be resting on the outside of the rim.
You may need to let some air out of the tube for the next step, but try to keep as inflated as possible.
Seat the now open side of the tire at the valve stem. Push the valve up, seat the tire, pull the valve stem down, make sure it is straight and seated well. If not, repeat above steps till it is.
Work your way around seating the rest of the tire into the rim.
Again, you may have to reduce the pressure in the tube to finish the seating off, but use tire irons to seat the tire opposite of the valve.
Now the tire should be completely on the rim, tube should not be pinched anywhere and somewhat inflated.
Pump up tire to about 30psi. Deflate. Reinflate to recommended pressure.
You tire is ready to go and will not blow out. It blows out because you pinched the tube.
I have used this procedure for years and it never fails. You can't simply inflate a tube in a tire, it will always pinch. You need to inflate to a firm roundness, then install.
Hope this helps.
Bruce
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