Good to know for the future, thanks! My 50/34 was supposed to come with aluminum rings with ramps and pins, but didn't, it came with steel rings with stamped ramps not as good. I immediately contacted amazon seller and they shipped the aluminum rings as advertised. The steel rings shift fine once I corrected the chainline. Whether ramped and pinned rings can do better, we'll see, my guess is yes. I don't need 52, and I can't go lower than 34 on 110mm BCD. For touring, if I need lower than 21 gear inch, I could try going to a crank with 74mm BCD inner for 30T or lower, however those are hard to find in a 2-piece hollow spindle design with 5 arm spider, which I prefer. Shimano did make before going to 4 arm with that weird fairing interface between the rings and spider. But now, not a worry, I can just go with a wider cassette, and keeping the 50/34 2X, I don't need to go that much bigger a low cog, on 20"/406 wheels.