Be interested in seeing what everything looks like at say 5k miles to see if any galling happens from shim removal ect. I think sometimes those shims act like a thrust bearing allowing 2 sides for movement in case one side doesn't want to spin. Maybe no problem, hardness and smoothness of parts helps.
I don't think wider gears were needed for strength in a bikes, just proper heat treatment to stop chipping, maybe the wider contact reduced contact pressures but if thickness was an issue they would be breaking instead of just chipping. Hopfully this will solve it by having better gears in them.
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