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That's a pretty open question - depends on the type of gravel and how fast you want it to be.
I've run most options from WTB (Horizon slicks, Venture semislick, Sendero knobby), Cinturato M that's been going forever and a Hutchison Touraeg 47mm and they all do what they're supposed to do.
I've got some heavier duty options for rougher stuff but haven't run most of them yet. 27.5 x 2.1 XC tyres for example
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A good all rounder are Teravail Washburn 650x47 they roll well on tarmac and have enough side knobs to get you into/out of trouble on the grav grav. Teravails always set up tubeless super easy and are pretty tough. TBH I’d be happy with any of their range, pick the biggest you can fit in the tread you like the look of.
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Still got these 650B Gravelking SKs that were pretty good. Probably not great in winter slop though:
What’s the 650b tyre of choice for gravel?