Pompiere

Some deraileurs work better than others, but a lot of people have been successful getting indexing to work, sometimes even mixing brands. Mostly, if the deraileur is of good quality, and the cables and housings are in good shape, you can get indexing to work. Sometimes a lever and deraileur aren't compatable because the amount of cable pulled per gear is different between two brands. I have converted two bikes to indexing for my kids, one with a grip shift, and one with thumb levers. I gave up on a third attempt, only because I ran out of time and I only had cheap cable housing to use. I may give it another go sometime using better housing, but since my son learned how to shift friction in two days, I might just leave it as is.