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For Zipp, better fit means better performance. Zipp's Service Course seatpost adjustablity insures that you will find your best fit. The low profile clamp allows the saddle to slide farther back on the rails for more adjustability. You will find either a post with no offset or with 20mm offset in order to find the ideal fit. Zipp’s Service Course seatpost and head are constructed from a single piece of 7075 aluminum for strength and light weight.