The deformation of the rim caused by the broken bar or loose bar, generally have axial jump (rim swing left and right) and longitudinal jump (rim jump up and down). If the deformation is not too big can be adjusted in the car, such as deformation is larger, the wheel can be removed, take off the tire, put on the flat circle device to adjust. Exclude the method of axial runout: first adjust the bearing gear, tighten the set screw, look for the size and range of the axial runout of the rim, and make a mark on the rim or outer tire of the runout section. If it swings to the right, use the bar wrench to first relax the over-tightened bar on the right disc of the runout section, and then tighten the over-tightened bar on the left disc; if it jumps to the left, adjust the opposite method.


Exclude the method of warp beating: first of all, exclude the centripetal beating, alternately loosen the tighter bars on the left and right discs of the beating section; then exclude the centrifugal beating, alternately tighten the looser bars of the beating section. If the rim is still jumping, in addition to adjusting the tightness of the jumping section of the strip, but also adjust the tightness of the strip near the jumping section.


Adjusting the lap is a delicate work, the bar cap nut each time the amount of rotation should not be too large. Generally, only one quarter to one half of the week is allowed to be rotated, and it is standard to adjust the entire rim to less than one millimeter of runout.


The rim can become severely twisted or "dead-bent" during bike training due to collisions or falls. If this cannot be corrected by loosening or tightening the bars, the rim, tire and bars (or part of them) can be removed and corrected with a stick or hammer (use a wooden pad to prevent the rim from being broken when hitting with the hammer). If the distortion is large, put the rim on the ground and flatten it with both feet. You can also use a crossbar to shorten the long axis of the rim, or lengthen the short axis. Then draw a circle of 670 mm in diameter on the ground and check it. If the circle and the ground circle basically overlap, that the oval shape of the rim has been eliminated. The corrected rim is then mounted on the bar for precise alignment on the leveler.