[Rendel Harris]

If I could pick your excellent brains, I’ve been offered a left-side Dura Ace crank with powermeter at a bargain price, it’s 175mm and my current Ultegra cranks are 172.5mm (which suit me very well). I assume it would be daft to ride with mismatched cranks, even though it’s only 2.5mm?

Thanks!

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[Rendel Harris]

Thanks for such a clear

Thanks for such a clear explanation, I hadn’t thought of it in those terms! Right, no power meter for me then (yet…).

[Whiii]

No excellent brains here but

No excellent brains here but I’d say you’re correct. If my maths is right that 2.5mm translates to around 16mm of extra travel relative to the other leg for every pedal stroke, or 1.6m for every minute you spend at 100rpm. I suspect what you’ve saved on the power meter, you’ll be spending on a physio several times over! And I’ve never tried it, but sprinting in a straight line might be tricky?

[Author]

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