Originally Posted by
alan s
That makes total sense, and thank you for taking the time to fully explain. I know manufacturers tend to be conservative, but exactly how much you can get away with is never clear (except until now). Sounds like the way you set up your drivetrain, one has to be careful not to crosschain, whereas with an MTB RD plus Shiftmate, there is the extra expense, and perhaps a better performing system, assuming the Shiftmate works. It's a tough call.
Right now, guess I'll try the MTB RD and Shiftmate route to see if it works, and if not, the GoatLink sounds like a viable alternative. (BTW, don't get too worked up by FB. We love him, but are often left scratching our heads.
)
alan s,
I was think this morning. If you go the 50 front and 40 rear you might have the same issues with cross chaining that I do.
I could be totally off the mark but just wanted to share.
Road, mountain and even touring drive trains that I've seen both usually max out in low 80T range but we're talking about pushing the 90T range. Depending on the derailleur's take up capacity it might or might not become and issue. If the derailleur doesn't have enough take up you get chain sag. Just make sure to check large large and be sure your chain is long enough so don't damage your new derailleur.
Good luck
Gadget