The chain rings have shifting pins and special tooth profiles designed to enhance shifting. They are made to work together and with a specific set of derailleurs. Whether another brand of rings will work OK is largely a process of trial and error. Some people report no problems, while others are dissatisfied with the results. Your best bet is to replace like for like, but YMMV.kingpin said:The two largest chain rings are worn on my triple bike, and I'm wondering if I can replace them with any rings as long as their the same BD?