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What is the purpose of spindle with longer non-drive side?

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?

One Answer

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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