Originally Posted by Ranger

My 2004 Trek 4300 with 2000 miles on it just got diagnosed with needing a new cassette. I think that is not very many miles but have to agree that i see shark fins. I sure thought they would last longer than that.

BTW, mine is just worn on two cogs, the gears that i obviously use the most. That is another element. The gears you never use will last forever.