How To Replace A Bike Tube (with Pictures) - WikiHow

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1 Pump up the replacement tube just until it has a basic circular shape. Adding too much air now will make it harder to reinstall. Adding too little will make it more likely to get pinched (and eventually punctured) by the outer tire when you reinstall it.[11] X Research source
- If you’re replacing the old tube due to a puncture, check the inside of the outer tire for sharp objects and holes larger than 0.25 in (0.64 cm), which will mean you need to replace the whole tire. Use a flashlight for a visual inspection, and/or run a thick cloth around the entire inside. Carefully remove anything you find. Do this before you move on to installing the new tube, or you may just end up with another flat tire!
2 Feed the new tube between the outer tire and wheel rim. Start at the valve stem and feed it through the hole in the rim. If the valve stem has a lock ring, tighten it by hand to secure the stem in place. Then, methodically push the new tube into the gap all the away around the wheel. Take your time to make sure the tube is not twisted or sticking out anywhere.[12]
3 Work the tire back onto the inner rim of the wheel frame. Once the new tube is in place, use your hands to push one section of the tire at a time back into the channel on the inside of the wheel rim. Tug on the tire with one hand while pushing with the other if necessary.[13] X Research source
- You may also use a set of plastic tire levers for this part if you are unable to do it by hand. However, be careful not to puncture the tube with the levers.
4 Fill the new tube with air to the recommended tire pressure. Look on the outer tire for the recommended pressure in psi (pounds per square inch), bars, or kilopascals. Use a pressure gauge to check your work.[14] X Research source
- An improperly inflated tire is more likely to puncture.