Hello, I'm looking to add SRAM power links or one of the other similar items that are around on each of our bikes. Thing is, we have a variety of bikes, chains (road and mountain), etc. What is the best way to know exactly the type of chain? I do not know how they are specced. I haven't looked too closely, but I assume name brand is on the links. I know the number of gears, but I assume that link length and width are probably important. Any hints? Thanks!