OK I finally got to test them out this past week on vacation with the 200X. I rode them for aprox. 2 miles in a creek bed full of wet sand, dry sand, water, mud, and large rocks. as well as close to 50 miles of trails through hilly terrain and mud holes. They performed great in all conditions. I was pleasantly surprised at how well they did in the sand. The aren't paddle tires, but I am sure they would out perform the crappy tires I had on it at trikefest. I would defiantly recommend doing this to your's.