Wheelbase changes too. The effective measurement has nothing to do with sag, it just means that the seatube does not attach in a traditional fashion to the bottom bracket--e.g. the seat tube is offset or bent, usually to gain some tire clearance. The 71 degree measurement is the actual physical angle of the seat tube to horizontal. Because the tube is bent/offset the total effect is that the saddle position is (effectively) the same as if the bike had a traditionally attached (and very steep) 74.5 degree seat tube.
Because Turner uses a traditional, straight, welded to the BB seat tube, 73 degrees is 73 degrees.
To summarize: 73 degrees actual, and 73 degrees effective for the 08 Sultan.
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