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I had a K-edge one with my old SRAM Red group because the downshifts were ridiculous. They work very well. You might not need one with Ultegra, but it's a small weight penalty to pay to guarantee you won't fuck up your BB area with a dropped chain
TvH-
Thanks @TomvanHalen You are correct about smooth shifting with shimano chainrings. I have a 105 (5700) on my steel workhorse. It's done 3000 miles and has never fallen off.
However I'm going to install a rotor compact chainset on this bike and want it to be faultless on rides that are up to 200km (yes really) http://www.opencycling.com/coast-to-coast-in-a-day/
TheArchitect
chain catchers? should I buy one or they just a gimmick? if I should get one, which? Token, K-edge and of course Rotor all have versions but what is the difference?