Originally Posted by
HillRider
More likely intended for the road triple market. A current 105 triple crank (50/39/30) and an 11x28 cassette requires 37 teeth worth of wrap. The 105 SS will handle 33 teeth and the GS 39 teeth so there is really a road use for the GS.
You might consider me old-school, but if I were needing a long arm RD, what advantage would it be get one with only a 28T max recommended cog size? Wouldn't the 34t max-cog-size RD handle the shifting just as well, pick up the same amount of chain wrap, and still allow for even wider gearing? Yes, I can see a need in the road triple market, but not sure how that isn't satisfied by a long-arm SGS or MTB GS type RD.