Good data. I didn't get that oem rate testing the spring; closer to an average of 862 lb/in which is 7% low compared to the indicated oem rate above). My spring test gear is good within 2% accuracy (factory spec), so a bit surprising there is this big a difference. In the end, you can test to get you close but you always have to ride to verify you are not topping out.Spring Rate for the YSS MX366-280TRCL 150 N/mm...854 lbf/in (Per US distributor EPM)
OEM Spring Rate 161.6 N/mm....922.74 lbf/in (Per specs in Service Manual)
So the YSS aftermarket shock is about 7% lighter than OEM.