When I did mine I just removed the ABS rings front and rear without putting any spacers in because the brake pads will self centre. I did also remove the wheel spacing shim at the back wheel. 15k miles later and no problems.
One thing I also did to tidy things up was to remove the front and rear ABS sensors, put them in the lathe and face them off. Once refitted they looked pretty neat.View attachment 356220View attachment 356221
The back one looks really neat but the front one is unnecessary as non abs bikes just had the empty void and the loop
The reason for the stop discs is to stop the wear of the rotor mount pillars If you look at the bobbins the contact directly with the rotor mount and there is actually not much extra area of the alloy The stop disc is invisible when fitted and is just a 1mm thick stainless flat washer about 17 mm diameter with an 8 mm hole
I have used these multiple times over my workshop time to get people back on the road with minimal outlay to them and save them having to buy a replacement wheel
I "advise" fitting them when you are removing the ABS tone rings
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