Rolling speed, especially on hardpack dirt, is a big deal. Even if you aren't a speed freak, rolling resistance makes you work harder to get where you're going. The Vittoria Peyote 27. 5 inch Tire is a very, very fast tire. This is because of its low profile center lugs. Don't think that this tire won't corner, however. Large corner lugs bite into the hard stuff as well as the soft so you can lay the bike over in the turns with confidence. We prefer to run this tire in the rear, where its low rolling resistance is put to best use.