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The sweet spot for XC bike seems to be around the 29x2.4 area, even that can be draggy on the road. I’ve only ridden one fat bike (ice cream truck) and it was slow slow slow on any thing remotely solid, but it ate up chunk like nothing else. The handling is slow as well so not really the base I’d chose for gravel. The 27.5x2.2 on my MS is really much more tyre than I’ll even think of needing, still…
Finally wide enough tyres for UK potholes.
https://youtu.be/Yg-5z9bjvRA?si=-yRsgOIN7BaJqJQ2