I didn't buy a 40mm endurance tire expecting them to be fast but these things are brutally slower than the Conti All Seasons I traded them for. Only inflated up to about 38mm so for only an extra 3mm and all that extra rolling resistance and weight, I think going back to 35 All Seasons may be in my future. That said, these things might go great on my fully commuter rig if I want a slick for the city since they feel bomb proof and can't be much slower than the Cinturato M knobbies I have on it now.
