I understand that stock is .62kg and I should go with .85 to .90. I have a wrist injury so a little soft isn't all that bad compared to stock, which is too soft I will be installing gold valves. I talked to a really helpful tech at BCM about this and he said that the Supersports come too hard in the rear and too soft in the front and he recommended the single rate spring in the rear and .85 to .90kg for the front with gold valves.