Fixing Punctures / Puncture Repair / Exploding Tubes

Also, put some air in the tube before you put the tube in. Not too much or the tyre will be hard to get on, but just enough to give it a round shape so it tends to expand out into the tyre and not fold up and get stuck between the tyre and rim.

this^^^ also "massage" the tyre into the rim, kneading it back and forth. Inflate a bit more and do it again. This should help the tyre seat properly and ensure the tube isn't caught. pump up to half pressure and give quick check over, then pump it up to desired pressure.