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There is a lot of information missing from this video, but assuming his pace is 12.4mph (in the range of a typical CAT 1 mtb race speed - 20k in one hour) with baggies, then his pace is approximately 12.6mph with spandex. A difference maker to most? A hr race would yield around 2min faster, which is often the more than the difference between the podium positions in XC races around here. On a trail with buddies? I'd say whatever's clever man.