Originally Posted by boston blackie

The high end on the Mezzo I-4 is 72.3 GI. That in itself isn't too bad, but, to me, it seems that I am losing about 25% efficiency in fourth gear. Now I have no way of measuring this, and I am probably way off, but
as they say, "Perception is 90 percent of reality." Also 39 GI on the low side can use improvement as I live in the hilly Berkshires.

I hope to get the range from 30 GI or lower to 96 GI with plenty of options in between. To do this I will have to change my chainring to 56t from the current 44t and add a 11 - 34 cassette. The locknut width dimension on the drop-outs is 135mm so the fit should be fine.