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I have Dura Ace Di2 on my Time and its been flawless (I only do road bike). I also have mechanical SRAM and that thing has been beat on by yours truly over the past four years and it has held up very, very well. So, my volt its still Shimano due to reliability and they invented the thing, (well, Mavic actually, I think). I do like SRAM a lot due to the way their lever feels in my hand. If I were to do it again, I would still get Shimano.
Nutmag, down tube 6 speed? Man, I thought ultra 6 speed freewheel was the chit when that came out. I still remember all the pimples on my face when it happened. Fun times
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