Exposing the inner tube without removing the wheel
Channel: sheldonbrown.com
Date: 2016-07-16

If you are going to repair a puncture by patching the inner tube rather than replacing it, you can remove it without taking off the wheel. You may want to do this when the bicycle has an internal-gear hub or hub brake,, or if the hub's axle is held on by nuts and you do not have the tools to loosen them. Detailed explanation is at https://www.sheldonbrown.com/remove-tube.html .