it is certainly worth a try. all you have to lose is a little time. you could either order the RD and try the old one and if it works return the new one. or wait and try the old one and then order a new one if it doesn't work
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk