Shimano and SRAM interchangeability
I'm building a bike, and so far I have installed the bottom bracket (GPX), crank (SRAM Rival series double crank) and the front derailleur (SRAM Rival). The cassette is a Shimano 9-speed one.
I plan to use SRAM TT 500 bar-end shifters. I understand one is friction (for the front der) and other is indexed (for the rear der). Can I convert the index shifter to work with the Shimano Sora rear der? Or, should I just buy an SRAm rear der?
I understand there is a 2:1 and a 1:1 ratio for Shimano and SRAM, respectively - I am not sure if this applies to ALL of their products, or just some. Do ALL SRAM products work on a 1:1 ratio?
If so, and I use an SRAM shifter, 'd have to move the rear der cable twice as far to get the same effect using Shimano components, correct? The SRAM front shifter/front der cable is friction only, so I assume that it's OK regardless of brand mix.