I've been going through the Shimano and Sram documents trying to find an answer but to no avail. Hopefully someone can enlighten me. If I were to run an e.13 DRS what is the maximum difference that I can run between the no. of teeth of the inner and middle ring whilst maintaining a clean shift. The Shimano technical docs give you a "Min. difference between top and intermediate" and also "Front chainwheel tooth difference" but neither is what I want. I would guess about 12 teeth.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Chainring difference