The answer to this question depends on how handy you are or how much work you are willing to do to save money. Paying someone to replace the tube would likely cost as much or more than simply purchasing a new tire. It also depends on the condition of the old wheelbarrow tire. If the tire is flat but in otherwise good condition, you can remove the tire from the rim to determine if the tube can be repaired or if it needs to be replaced. This can be a difficult and frustrating task.Replacing the whole tire (including the rim), on the other hand, is a very simple task. If you have a tubeless tire, plugging a hole is tougher than replacing the tire (and the rim), but it’s not as hard as repairing or replacing a tube.;