1x with a 48t chainring would give really big gears! Ultegra long cage can only go up to 34t cassettes IIRC
You could use a GRX rear derailleur and a 46t cassette - not officially supported, but it works.
Ultegra long cage can only go up to 34t cassettes IIRC
R8000 derailleur go up to 11-40 with a compact (your frames may vary).
It will even do 11-42 if you avoid running small-small
11-40 with a compact
I'm struggling to find a scenario where such a pairing makes sense.
@edscoble started
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1x with a 48t chainring would give really big gears! Ultegra long cage can only go up to 34t cassettes IIRC
You could use a GRX rear derailleur and a 46t cassette - not officially supported, but it works.