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Don't use your thumbs to try and push the tires onto the bead. Use your palm to roll it on there and never your thumb. Also, do not use your tire levers to put tires on. Asking for pinch tube. A normal bike to ride around, all tube will be the same.
One other suggestion is to blow up the tube a tiny bit and shove the tube in then try and mount the tire until you get to a point where its impossible without leaking air out. That's the time to let out the air and roll the bead into the rim. This will eliminate the bead catching the tube causing it to flat.
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