I'm keeping the old rims for two reasons. The real reason is convenience and money - since they are there and they seem sort of decent why waste money for new ones. To everybody else I'm telling that I'm saving the precious change percents because it's much cooler reason than being cheap or just broke.
But how decent the rims actually are? I did very scientific measurement for roundness and the spatial displacement (see the pic). I put the wheel on solid stand where I can rotate it and then I have the cord with a bolt pendulum with a tape marker on it. This was actually pretty accurate, and it gets better with a hint of modern tech -- put the wheel spinning and take slow motion video with a phone. Gives easily accuracy less than millimeter.
They are round and flat with displacement less than the mentioned one millimeter.
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