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Hello Retrowers. Question about my olde P7 seat tube size. How big is it? 97 P7. It has a USE shim in it that shims to 25mm. Is this right. Im thinking of putting some USE carbon bars and seat post on it. Not period but hey, that will be up for discussion later. Is it ok to use a carbon seatpost with a shim or is it better to use the whole diameter? Look forward to your advise.