The Improbable Bulk
Join Date: Jul 2005
Location: Wilkes-Barre, PA
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I will preface by saying I am not an expert... I have never used Dura-Ace or 105.
However, from my understanding the major benefit of the upgrade is that you will save a couple of grams on bicycle weight... and of course the bling factor! Of course if you are replacing a new 105 with an older Dura-Ace, then you might just have bling.
The pieces should be interchangeable, but the alignment and adjustment may make it enough of a pain to bypass the process if you aren't sure about what you are doing... of course books, the Sheldon Brown site, and the Park Tools site will give you details on how to adjust the equipment if you want to take that plunge.
If the derailleur happens to be adjusted properly and the alignment of the hanger is not different between the two models, and you install it properly, it is just swap it and ride... but that is best case. I would expect you will need to do some adjustment as well.
Slow Ride Cyclists of NEPA
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