In recent years, the overall aluminum wheel replacement motorcycle wheel has become common, a considerable part of the rear wheel with a round bush (slow; in sets) with a flexible retaining ring stuck drive large sprocket.
 
In the poor rural areas of the road, usually more than a year, some even only a few months, there will be a large sprocket in a sudden slide down, it is because; in shock power too much damage caused by bushing, Resulting in elastic retaining ring can not be stuck, because of this ring groove groove wear will replace the entire rear aluminum wheel, it is uneconomical.
    
To find a very suitable method for your reference, the specific method of operation: the overall unloading of the aluminum wheel flat on the ground, first check the four bushings, if loose on the new ones. The drive large sprocket installed, with a slightly hard cardboard flat on the circle above, press out a circle, according to the printed circular cut, and then cut, both sides can cut a little more; the cardboard model Flat on a 2.5mm thick iron plate, the specific thickness of the iron plate according to the groove groove wear depth to determine the use of stone to draw the graphics; grinding wheel in the burr, then the two iron together in the block force Ring groove, the attention of the best can not be loose, and finally welded on both sides with welding. But also in the iron plate next to the fixed sprocket nuts where welding, so more solid and reliable.