• Weird conclusions imho.

    Set 1 (trails and cx) = big, treaded tyres in 650b

    Set 2 (road) = smaller slick or file-tread tyres in 700c

  • Big slicks are plenty fast enough but much more comfortable.
    Skinny tyres do well cutting through mud.

  • In the beginning when I heard about 650 gravel thing I considered it in the same way as @miro_o, but later got concinced that wide 650b & narrow 700c knobby is the way to go.

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