I run Compass 1.75" on one bike, 2.15" Big Ben's on another (how I ended up with two 26 inch bikes is a long story). I run both on mixed terrain, with good results. The Compass tires spin up faster, and I use them for day-long rides (75+ miles) with a mix of pavement and trails. The Big Bens will pretty much roll over anything, and I tend to use them where that will be helpful: think monster truck.
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