I know the general pros/cons of different tire constructions, but I've never owned a set of bias tires so I really don't know just how extensive the difference is. I know they ride worse on the highway, but is it like washboard road rough or sunglasses flying off the dash rough? What about mileage differences? I'd like to hear some testimony of people who have had both types on the same rig and give some mileage numbers, both for the life of the tires and gas milage. I'm kind of torn between some bias TSL's (in either 36 or 38) or a 35ish radial for a 16" rim. Right now with 33" radials I'm getting 10-12 overall, I'd give bias a shot as long as that didn't drop too much. Also, I've heard and can understand that radials are better for sand use, but is that more of a theoretical thing or would I really notice a difference with comparably sized tires? Half of my wheeling is sand and the other half is really rocky trail use. As in lots of medium sized sharp rocks. Thats the motivation for the bias also, as I've read they ride better at slow speeds over rocky terrain, a benefit of thier tread flexing more.