Is it possible to use that gear calculator to measure RPM? Or can the figures it spits out be interpreted to see if my guestimate of 15-18RPM (ish) between gears is correct?That's not too tough. 3*3 has become a regular customization over the last years. Here's my setup:
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Shifting is pretty linear (three times derailleur, then one time hub) and nicely spaced in this variant. Not more confusing than the actual BWR.