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... larger tube mismatch because it can get mighty crowded stuffing a too large tube into a tire.
Yup, can be done. Just gotta be extra careful not to pinch the tube when stuffing it in.

So a 28 tube with a 33 tire is no bueno ??
Sure, no problem at all. Try pumping up the tube outside the tire until it's 28mm (1.1") wide. Then continue pumping until it's 33mm (1.3") wide. Notice the minuscule 5mm (.2") change to the tube with no ill effect. Then continue pumping and see it easily go much bigger.
 
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