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A comment on Why did we wait so long for the bicycle?. Parent comment
It is the little parts that matter. Not just screws; really-spherical ball bearings, ceramic-hard bearing races, micrometer adjustment.
Without good bearings, friction and wear make it a short-lived toy.
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It is the little parts that matter. Not just screws; really-spherical ball bearings, ceramic-hard bearing races, micrometer adjustment.
Without good bearings, friction and wear make it a short-lived toy.