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I've just discovered that Shimano has 107mm and 110mm spindles in their BB (square taper) -- the first one is symmetric and the second one is asymmetric. I have read why BB spindles are right-asymmetric (longer) -- chainring clearance -- but Shimano released such BB that spindle is longer on the left side (i.e. non-drive).

I don't get it -- all the trouble with clearance is on the drive side, so once you have given length, you make it double. Where is the need for longer left-side of the spindle?

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    It may have to do with the mating crank arms. Sometimes one side had more of an offset than the other side.
    – Daniel R Hicks
    Dec 18, 2020 at 15:10
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    @DanielRHicks, straightforward world of cycling :-) Thank you. Can you post this as regular answer.
    – greenoldman
    Dec 18, 2020 at 15:52

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It may have to do with the mating crank arms. Sometimes one side had more of an offset than the other side.

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