《周礼·冬官考工记·轮人&輈人》
看车牙的绠处，要绠内侧的蚤安得很正。观察辐的蕾和蚤成直线相对而没有不齐，那么即使轮用坏了也不会变形。
眡其绠，欲其蚤之正也，察其菑蚤不龋，则轮虽敝不匡。
When looking at where the teeth of the wheel are bound together, the binding on the inner side can be firmly fixed. Observing the spokes and the binding in a straight line with each other and with no irregularity, even if the wheel becomes damaged it will not become deformed.