But actually there's slippage (resulting in transmission losses) and this produces noise. Since gears are surface hardened, they wear out very slowly. So transmission 'run-in' is quiet long. Feel the difference between the gearbox of a three year old properly maintained bike and one just out of the showroom and you'll realize that the new one a bit clunkier than the old.
Now, above is my two cents; I don't want to open a Pandora's box regarding mechanical engineering.




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