They go round... In my view, jockey wheels last as long as they keep the muck out. In this case the original top wheel lasted 1.5 seasons and the bottom one is still going - so not bad. Just so you know, the top one is bushed (ie has a bush bearing), lower one is with steel bearings. These SRAM replacements are not cheap but I am not sure anything but SRAM parts would fit, so buy the jockey wheels or change the mech...
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