Originally Posted by
redlude97
If he's buying a new RD, then he should just buy the one that works for sure. You simply won't have enough capacity with a short cage RD for a 50/34 11/34 combo, even if it clears the 34t, and sizing the chain for it to work forcing you to not use the 50/30-34 combo without exploding your drivetrain is simply not a good suggestion IMO.
I get the impression that most of this forum is cheap asses. If I suggest anything but Walmart level bikes, people jump down my throat because those parts "aren't necessary". I honestly thought I'd get a gold star next to my name or something for suggesting a way to possibly save money
It's really easy to try my suggestion in the work stand and order the other derailleur if it doesn't work. WORST CASE he ends up where he was going to start anyway. Best case he saves $50+