Having a flat bicycle tire can leave you stranded, but it’s simple to replace the tire yourself. Usually, this just means replacing the tube inside the tire. However, you may need a new tire if it’s very damaged or worn. Before you replace the tire, you’ll need to take it off. Then, replace the tube and tire, if necessary. Finally, put the tire back onto the wheel. [ Edit ] Steps [ Edit ] Taking Off the Wheel Put your bicycle on its side with the chain facing up. You can’t remove a tire while the bicycle is upright because it will fall over. The chain side, which is called the driving side, should always face up to avoid damaging it. You can also turn the bike upside down, resting it on its handlebars. Some people don’t like turning it upside down because the handlebars or seat can get damaged. [1] As another option, you can invest in an upright bike stand that will hold your bicycle while you work on it. You can find these stands at some bicycle stores or online. Also, you ca...