I know the difference between a top and bottom swing derailluer, but am curious whether their are supposed advantages with either design besides the clamp mounting height?
I've used both and my experence with bottom swings has been less then stellar, but is limited to a 10-15 year old exage mech and an late 90's LX. However, most people seem to say that the bottom swing is crisper and more reliable.
The reason I ask is I finally found a couple of top pull derailleurs that will work with the 38/48 set up on my cyclocross bike. One is a top swing, the lowest end model, the other three are bottoms swing.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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