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swedeee-
Are you some kind of giant?
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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
snottyotter
gbj_tester
I'm currently failing to sell a brand new in box R8100 chainset, 50/34 170mm. £140 posted if it's helpful?