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               Originally Posted by 
               66T 
                
               
             
              I generally get around 5-6000km from front sprockets (13T), around 16000 from a chain and my rear sprocket (50T) has been on forever, I think >40,000km.
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         That'll be the difference between south Australia, and the English Lake District. Different 'sand' (ours is mostly Granite / Peat - one extreme to the other), and the excessive use of road salt and temperature extremes (+20c to -20c) and precipitation extremes (100mm last month) I'm guessing, but I would think Aus is a little more stable in temps of environment.