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too short
In tests, scientists concluded that there was no such thing*. The difference between 170 and 172.5 is not only too small to notice, it's also too small to measure reliably in terms of biomechanical efficiency because the noise floor is above the signal.
*Tests between 150mm and 200mm
gbj_tester-
i don't doubt that for a second. but in my head it makes a difference
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I remember always having 170s and then noticing a slight difference when a had a pair of 175s; a hair easier to push a taller gear but a tad harder to spin. I liked the extra leverage but not the lower... redline? Had 172.5s ever since, which as you say is hard to notice the difference, but it's obviously a good compromise between what I liked about the sizes either side.
Then again, I'd probably be among the first to notice, given I despise cassettes without a 16t, and am not keen on ones without an 18t... And a jump between 11t and 13t makes me shake my head in wonder. Been wanting to mod some Ergos to friction in order to shift a CVT forever.
swedeee
Kimmo
appreciate that but too short for me :-)