A few weeks ago I inquired about big cogs and road derailleurs. The best suggestion seemed to be get a mtb der. So I got this off the bay for proof of concept. RD-M750 good to a 34t. Which is what I had gotten off cl. This way zoot Sram thingie. Set-up actually works like a whiz ! Amazingly I can stay upright on the 39/34 gear. Haven't had a chance to try it on the local grunt (for me) grade yet but that is on the sched for tomorrow. With so many big cogs on the cassette I suspect that I'll be using the 50 rather more now. Update in a couple days.
It's on this https://www.bikeforums.net/classic-vintage/1290674-almost-done.html





Coming Soon ! ! The Adventure of the Big Pulleys ! !