Bicycles Asked on August 29, 2021
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?
It may have to do with the mating crank arms. Sometimes one side had more of an offset than the other side.
Correct answer by Daniel R Hicks on August 29, 2021
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