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@marxist_vulcan
Hi..my choice is 105 5700 or DA SL7900....I have used both before and got in with both and can see advantages and disadvantages to both but would like (if possible) other opinions on the subject.
The chainset is 10 speed 46/30 Velo Orange TA Cyclotourist copy/update....the cassette will be 11/11-32. The bike is going to be a fast tourer. This is for some context.