I just received a 42 tooth sprocket to replace the stock 44 and while comparing the two I noticed one big difference. On the side that goes in first towards the track there is a slight pertusion that is the same height as a stock one but is much smaller in width I guess you could say. I pulled out the shim or spacer and the pertrusion and the spacer are very close to the same size in inside diameter but the spacer has a chamfer on the inside which makes the chamfer a little larger then the inside diameter and almost the same size as the outside diameter of the sprocket. On the stock one the width of the pertrusion is much larger then the spacer allowing it plenty of surface to ride upon. I am scared that some how the spacer could slide onto the sprocket a little changing the alignment of the two sprockets. Has anyone had this issue if so did you leave it or change something. I will try to get pictures to better illistrate what I am asking.