Measuring my « SAG » - Adjusting the spring’s « pre-load » First of all, what are we talking about ? 1/ The « SAG » is the vertical movement of the sit-ski’s frame when you sit down. This is the compression of the suspension due to your weight. 2/ The « pre-load » of the spring is the length difference between the disassembled spring and the compressed spring while mounted into the shock absorber. For a good functioning, a spring must be compressed from a certain value: this is the pre-load. 1/ Our sit-skiing experience, allowed us to define a SAG between 35 and 40 mm. The SAG has a primordial impact on the ski-snow contact and on the small shock’s absorption (comfort). relaxation period, if the SAG is not enough (15mm for example), you will lose the contact on the snow and you won’t be able to keep your trajectory. On the contrary, if your SAG is too important, you won’t have a good feeling of your ski and you will be less reactive. All the difficulty is to find the best compromise. In order to define your SAG, ask someone to measure your frame empty (the Scarver here) between the bottom of the seating part and the centre of the screw (red point). Sit down in your sit-ski, push up with your outriggers and release the pressure for stabilizing the pressure on the shock absorber. Take the measure between the same points. The difference of the length is your SAG (for example : 160 mm – 124 mm = 36 mm). The SAG must be between 35 mm and 40 mm. Otherwise you have to control the pre-load of the spring. TESSIER, Alpespace, 336 voie Thomas Edison, 73800 Sainte Hélène du Lac, France Tél : 33 (0)4 79 83 51 52 SARL au capital de 400 000€ [email protected] www.du

Tessier tip sheet MAJ le 29/03/2019 2/ The disassembled springs measure 200 mm until 18 Newton. The springs from 20 N are 220 mm long. The standard pre-load is 15 mm. In this case, the spring measures 205mm when mounted and compressed in the shock absorber. - If you have the Öhlins “PRC” shock absorber, your sit-ski was delivered with 1 or 2 special keys allowing screwing/unscrewing the preload adjustment rings. By unscrewing the rings, the pre-load is decreased and the SAG increased. At the opposite, the SAG decreases when the pre-load increases. - If you have the Öhlins “TTX” shock absorber,...

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