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Isn't 170cm shorter than average (I'm not certain I'm still in imperial for height)?
I can tell the difference between 2.5mm when one was too big and the other just right :)
(Frankly 5mm was really obvious when both within size, so I wouldn't be that surprised if some could tell the diff)...
plus it felt more comfortable
Ignoring whether strava makes a difference, if it felt better that's probably a pretty good indicator!
ah yes, makes sense, I should try 165mm buyaboat.jpg