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Service Course is the higer performing version in the Zipp line of components. Zipp’s Service Course SL seatpost is constructed from a single piece of 7075 aluminum. To save more weight, Zipp uses titanium bolts and more intricate machining then the standard service course models. Offset is either 0 or 20mm and the lengths are 330mm or 350mm. Adjustability is also enhanced by the use of a low profile clamp that allows the saddle to slide farther back along the rails.
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Comments about Zipp Service Course SL Seatpost:
I got this seatpost in beyond black to match my service course SL stem and CSL handlebars. Zipp stuff is on the expensive side but you are paying for their quality and streamlined aesthetics so try and get them on sale to get a good deal!