I haven't read through everything, but I'm not seeing the new Etap as having a viable 1x gravel option? The road cassettes don't have sufficient low gears and the mtn cassette is only 10-50, but I doubt you could pair the 11-50 with a 44t ring or something or bigger using the eagle RD?

Edit: Shimano has a 10-45 12 speed cassette (assuming you had the micro spline freehub) - I'm wondering if etap eagle would work with this using a 44 or 46t chainring.

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