I did a bunch of searching around to compare the gearing for my existing XX 2x10 with 24/38 in front and 11/36 in the rear in order to decide what would be the best gearing for the very steep bay area mountains for my XX upgrade. I was annoyed by the simple rounding that everyone was doing just to one decimal place which did not give an accurate comparison and a good sense for the gear spacing that is inherent to XX and XX1.
As you can see in this chart the granny gear on my XX is equivalent to a .667 gear ratio so if I go with a 28 front chainring with XX1 I will get the exact same ratio for the lowest gear and be effectively at the same ratio as having my front chain ring at 38 and rear in the second gear which is roughly 13.78 ratio. So I only lose two very top end gears. You can play around with the assumptions to fit your style and specific geography.
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