Originally Posted by
BabyCowHK
Sorry I made a mistake of the total capacity of 28T on Saint/Zee Rd. It should be "25T".
Like I mentioned in the previous reply. Don't use Saint/Zee with a double chainring setup. The total capacity of 35T is too much for the super short RD cage to handle.
Front diff 53-39T=14. Rear diff 32-11T=21T. Total diff 14+21T=35T.
Consider going with R7000/R8000 short cage RD for 35T diff.
I have R&M Birdy Touring with factory hollow crankset. Do you think it will make sense to add only BCD130 53/39 chainrings or replace whole front drivetrain including crankset for Shimano 53/39?