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I find it curious that Trek stopped using ZR 9000 in there 2000/2.X series bikes anyone know why? Also I have a Trek 1500 according to Trek archive its a Alpha Aluminum SLR (which I guess is better then the Alpha Aluminum SL found on the 1000-1200) but what kinda of frame is it exactly and whats the difference between SLR and SL. My father has a Trek 1000 and I notices the welds on his bike are rought where my 1500 welds are smooth and blended.
 
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