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...I used to use the Z series chains, but once the X8 series started selling on places like Amazon for less than 50 bucks ffor five of them in a bulk package, that's all I've used in the past 6-8 years. They work well on everything I have, and that covers a broad range of stuff, from the 60's up to the 90's, with 8 or fewer cogs in back. I think they still make and sell the Z chains, but I don't know why anyone would use them instead of the X plate ones.