It's certain technique/process thing:
1. after getting tyre onto rim, squirt soapy water along both tyre beads, helps seal and slide tyre over rim-bead.
2. shove tyre down as much as you can all around on bottom side (make sure not to lay rim on brake-disc). This seals bottom bead on rim.
3. apply air while lifting tyre up to seal upper bead. If you have 3 hands, hold tyre at tread on both sides near valve-stem and lift. This seals upper bead against rim keeps air inside tyre and >POP< keep your fingers clear!!!
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