0% interest AND you have money in the bank to cover it can be a good deal. Taking a loan out to get gratifiction right now because you assume you are going to have more money in the future = massive risk.

If you don't have money to buy a $5000 bike, then you don't NEED a $5000 bike. In fact, NOBODY needs a $5000 bike. I can show you countless examples of $700 bikes that will do the same thing. You can finance a Rolex, or get a Timex. They both do the same thing.