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               Originally Posted by 
              jimmysimpson  
              If you have a good tyre for mud conditions, the tyre will self clean so build up is not an issue. I use an E09 rear because I can get 5000 miles from it as opposed to 2500 from a C02.
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         Depends how muddy it is...
         
         
        
 
         
         
         
         
         Don't get me wrong, I think the E-09 rear is a great road and trail tyre. But I think Monsieur 374 may be after something a little more aggressive, and a bit less concerned about life.