Aftermarket 11-34t cassette definitely with a bit of adjusting (IRD being an example).
11-36 if you go single chainring, maybe.
Why not 11-36 with a double? It's long cage mech, I remember running 11-36 on a mtb with triple chainset and same length mech?
I've already got 11-32... 2 extra teeth isn't enough (;
2 extra teeth is a noticeable difference especially with a 34t inner chainring (1-1 ratios).
Define same length, are you talking about the arm, or the arm + body?
5800 long cage will do 36 + 50/34, but at a massive push. B-limit all the way in, and even then you'll hear that dreaded grind, and at times, it'll refuse to drop. I'd just invest in a wolftooth roadlink and you'll be sorted.
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Aftermarket 11-34t cassette definitely with a bit of adjusting (IRD being an example).
11-36 if you go single chainring, maybe.