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Actually our method of taking measurements is based directly off the manufacturers recommendations and the only exceptions are 2016 and newer KTM and Huskys where you do measure vertically to the mark they provide. We state this clearly in the video user guide. You can take a measurement anywhere but it will not give you the right number unless you measure in the right place. Say you set your sag to 105mm measuring vertically then take the measurement like it shows in your user manual- to the back of the seat bolt to account for the arc of the axle...