FRONT FORK SPRINGS
Recommended Fork Spring Rate for Street: 0.902 kg/mm (use closest available)
Stock Fork Spring Rate: .800 kg/mm (stock)
Available FRSP S3732 Series Springs are
For racing
Rider Weight: 180 lbs.
FRONT FORK SPRINGS
Recommended Fork Spring Rate for Racing: 0.967 kg/mm (use closest available)
Stock Fork Spring Rate: .800 kg/mm (stock)
Available FRSP S3732 Series Springs are
well - to help out then. Entering street riding and 180lbs you get the attached. Doesn't account for two-up but in my simple mind I'd figure that the extra weight is distributed so that it wouldn't cause a major issue for the forks.
one thing that they do not mention is the oil weight, which is just a step above water from stock and you should think about getting some heavier stuff when you do the swap over.
I went with 15 weight oil in the forks and love it wholeheartedly! I found the stock setup very jittery in corners and over bumps and the heavier oil settled that and gave it a much smoother and planted feel.