Have a 58cm 2017 and a 57cm 2020 Appa and would like to point out that in those years the rear clearance increased actual between the chainstays from 60mm to 70mm. The smaller frame is actually longer, by 1cm, so a 62.5 top tube as opposed to the 58s 61.5. The front clearance stayed the same obvs because the fork crown has not changed. Only ever managed 2.1 knobbies on the old one and that was tight. on the new one they have heaps of room and 2.25 would be fine. BUT haven't actually done it. I intended to set up the 57 as the 'fast' one with a short stem and a dropbar of some sort but felt for me just too long even with a 5cm stem. Ended up inverting a billie bar on a 130mm stem and get a really nice forward moustache bar like hooks to lean into and a very comfortable upright position at the grip end of the bars, more upright than the short stemmed drops. Running Antelope hills on NoBs with a 51mm actual, tonnes of clearance and have acheived a 'fast' rivendell build. Can post a photo but would have to make the effort because I dont smart phone.
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