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               Originally Posted by 
              marques  
              The off road terrain is rocks, rocks and more rocks with the occasional mud bath. But mainly it's a bike that I use to get to and from work. A road bike and a Sunday in the mountains.
              
 So I think (without any good reference) the 2.5 would be more nimble in the rocks. But 3.0 would be a bit more durable.
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         2.5" is the default choice, and probably the way to go. Better suited to the terrain you ride, it's also stronger and will be better protected by the tyre's side wall.