After assembling any wheel to the axles, please check the gap between the screw
thread and the collapsible, if the gap is too big, please add two or three washers
inside the wheel, but after tightening the nut outside the wheel, please turn the wheel
by your finger to check if the wheel can run smoothly, this is very important, because if
the wheel can run smoothly, it is ok, but if the nut press the wheel and the wheel can
not run smoothly, it maybe produce heavy noise or some parts break easily. Then you
need to decrease one or two washers to make sure the wheel can run smoothly.
WARNING: SAFE RIDING RULES
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