Originally Posted by
fietsbob
With a Schlumpf High Speed , 2.5 X overdrive internally geared crankset
you could do a 70t equivalent with a 28t actual chainring...
Please explain the mechanics of how a 28t will be the equivalent of a 70t chainring, and how this schlumf is superior to a 70t in terms of hitting high speeds. I've never heard of schlumf, must be new.
Thanks!
--edit after some quick research, apparently you lose up to 5% efficiency. And considering it's over 800$, you could find a 70t chainring for less than 100$. Only benefit is the ability to hit a lower gear. Cool but not for me.