Only got to ride with Robbie and the 3" for 1 day and only spent a short amount of time on it. IMO they are both a huge step above the 163's.
I didn't get enough time on the 3" to see the pluses and minuses....the 2.5 works great in all conditions.
Cool. Thanks alot. I will probably use a 2.5 then and hook a little more power to it to get up the hill a bit better.