Tire and Tube size mismatch I have a tire with 24x2.125 written on it, and the new inner tube which I'm planning to install 24x2.175-3.0 Is this too big for the tire and can be prone to punctures etc. or should be OK? It is a conventional bicycle.

UPDATE - I ended up buying a tube the same size as the tire and it fits perfectly. I failed to install 24x2.175 tube because a piece of it was sticking out, I worried that the tube would fold inside the tire and would wear off quickly.
If its unopened you might be able to take it back to the shop and swap for the right size, but the difference between 2.125" and 2.175" is 0.05" which is only 2.3 % smaller so it would probably work fine.

There may be a bit more tube than you strictly need, and this could make pinching the tube easier when fitting it, so do take care.

Otherwise, a tube is probably one of the cheapest parts on a bike, and buying another won't break your wallet.