Removing the rear wheel (to fix a puncture, for instance) requires a methodical approach to handling the gear control:1. You must shift into 1st gear using the twist shifter. This gives maximum slack to the gear cable. 2. Unhook the gear cable nipple from the cassette joint arm on the hub (no tools required). 3. Loosen the wheel axle nuts and make a careful note of the orientation of the tabbed anti-rotation washers (the small washers with a tab that fit into the frame slot). 4. Gently remove the chain and take out the wheel. 5. When refitting, you must put the tabbed washer back in the correct position and reconnect the cable. Your drivetrain will be instantly set back to its original alignment without any extra adjustments needed\!