Bought set to use on my 29er Dirty Kanza Race in Emporia, Kansas. Unfortunately for me I didn't make the lottery to race this year but have put these on my mountain bike anyway. The 1.5 inch width is much quicker on the Flint Hills Nature Trail and Prairie Spirit Trail. Nice ride and much quicker than the 2 inch tires I had on before. Smooth ride but I would not suggest using in mud.