Proper maintenance of a bicycle is essential for safe use, whether you use your bicycle every day for commuting or only take it out a few times a year when the weather is nice. When people hear about bicycle maintenance, they most likely think of the brakes, the shifting system and the chain. Wheels, and tires in particular, only get attention when one is flat. Maintaining the correct geometry of a wheel, which means perfectly flat and round, requires equal tension of all spokes and is essential to the safety and performance of a bicycle.
How to reveal the wheels of a bicycle: 13 steps (with pictures)