Originally Posted by
Bonts
My rear deraileur has a max capacity of 29t and a max front difference of 14t. That means an 11-25 cassette and 53-39 chainrings… at least that’s the only off the shelf combo I found, and only in 105.
Do y’all think I should do that, or get an Ultegra 52/36 or 50/34, and get an extra chainring to reduce the difference?
Yeah the old rear derailleurs suffered from too low capacity and too small cog size. Anyways, you can switch to RD6700, which has a total capacity of 33T and max cog size of 28T , and matches the rest of groupset to boot. You can then run 11-28 cassette with any of these cranksets you've mentioned. If you are riding on flatlands, 53-39 is totally fine. If in the hills then 50/34 is better.