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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.
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I'm running a Shimano SLX chainset and front mech with 38 and 28 teeth combined with an 11-34t rear cassette. That works really well for me on 700x 40c. Being able to dump a bunch of gears in one go by switching chainrings works really well.
mind_maze
Alex_B
@skipper
I hope no one minds the cross post from the 'any questioned answered' but I've had the 1 x vs 2 x debate for a sort of cross bike but wanted to gauge opinion on the set-up, particularly Middleburn Ro2 cranks, here goes: ...... I'm tempted to run Ultegra R8000 shifters/long cage rear mech with Deore cassette for a 1 x setup using a Middleburn RO2 chainset. Is it wrong/will it work? Any opinions on a new Ro2 chainste/crankset also gratefully received. I'd run it with a 48 chainring, ideally a Specialities TA Syrius but thats not set.... Yours sincerely, etc etc