Obviously removing material reduces the stiffness of the tires contact area, and allows it to deform around uneven surfaces. What I don't buy is the notion that there is a benefit to directional specific tread patterns. A Pasella is the same as a Jack Brown is the same as a (brand x) Panaracer made Clement knockoff ect. And that's great, because those tires are all great compared to Schwalbe Marathons and Vittoria Randonneurs.
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