I'm finding after over a decade with the same bike running the same parts a few group/era specific points have faded from memory.
Bike is running a full Ultegra 6700 group with severely worn out 39/53 rings. Today I came across a deal too good to miss on a DA 7900 54t. FD works just fine with matched B type 34/50 compact crank(16t spread).
The question is will finesse and possibly some mechanical jiggery pokery allow one to continue spirited riding with the mismatch. Or should I forget I ever considered it and hunt down a 42t. After 4 notices parts were backordered and a few outright refunds due to non-existent stock in the last week. I'm solid on the fact there is a new 6700 39t inner ring in my parts bin. Procuring the matching A type 42t is actively being considered a crapshoot since I can't trust online stock trackers.
