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David, I always consult this chart when tinkering with Shimano/Tange cartridges as the offsets can vary from size to size quite a bit. From what you say I myself would be inclined to go with the 113, given that your 40t middle ring has the same or more clearance than your 26t. -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/983c144c-7353-478c-a63e-fb691db9e659o%40googlegroups.com.
