The unicycle is not complicated, but it needs a little maintenance. First, what tools are needed for maintenance and maintenance? What are the tools for the maintenance and maintenance of the unicycle?    Here are some key points:The crank is ringing: stop cycling and tighten it immediately.Let it go on and your crank and flower drum don't want it.The sound comes from the pedal, which is often mistaken for spokes.Square hole crank: twist the nut of the crank and tighten it with a 14 mm sleeve (or 8 mm hexagonal).Spline crankshaft: both sides are tightened with 8 mm inner hexagon wrench.Spokes rang: although not common, but the spokes telescopic movement over a period of time can really make the wheels strength weak, adjust the wheel seems to be a very professional job, but if be careful for it is not difficult for a layman.If only the spokes are loose but the wheel is not deflated, the spokes will be stretched 90 degrees in each of the spokes. Carefully, don't miss each of them until the spokes are pulled tight.Step down: stop!Keep your seat in front of you, and check that the left and right feet are in the wrong direction, and if you loosen your grip and continue riding down the crank and pedal to the end.Hold it on a 15 mm plate.If the foot and crank had been damaged, the "single-wheel China" had spare parts to sell.Remove the crank you need a crankshaft.The saddle screw loose: while practicing the wheelbarrow, the constant drop of the car will loosen the screw between the saddle and the seat tube, and it should be checked periodically and tightened with the 11 mm sleeve holder.The frame screw is loose: when the frame has a different ring or vibration, stop to check the screw, allowing the screw loose to cause the frame to burst and destroy, and tighten the frame with 10mm or the inner hexagon.The frame screw is too tight: the screw loose is very rare, if found loose the need to tighten immediately.In fact, screws are often overdone.If the wheel does not roll smoothly, the screw must be pinched one or half a circle.If the bearing is clamped too tight, the time will wear out badly and can only be replaced.The tyre: a flat tyre or tire when cycling in air condition is bad, because all of your weight on a wheel, you need to be within the tire air pressure is higher than your weight, the state of the gas shortage tires will cause high speed turning and jumping at the same time let the wheel deformation.External tire wear: when the unicycle is used for a period of time you will find that at least one or two of the outer tubes are badly worn, which is caused by the movement and rotation of the original.The improved method is to release the air and rotate the outer tube 90 degrees.