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I have had every drug on offer, sub compact with 6603 and 11 speed junior 14-25 cassette, in 2018
I reckon a junior cassette paired with TT rings would be the go. More teeth is better for efficiency and reducing the effect of the gaps growing instead instead of shrinking bug. If you can get more 2t jumps and even a 3t jump or two to cover the range of say, a 53/39:12-25, that's a couple of closer ratios in the middle of the range where the 1t jumps start.
I have had every drug on offer, sub compact with 6603 and 11 speed junior 14-25 cassette, in 2018
and my Di2 triple discussions date back to 2016 on whatsapp groups, granted I was blocked for talking nonsense but it was worth it
I just want some AXS, I have paid my dues, never ask me to justify my buying decisions EVER AGAIN