| Rider weight | spring rate |
|---|---|
| 90-140lbs | 950 lb/in |
| 141-180lbs | 1000 lb/in |
| stock spring | 1016 lb/in |
| 181-230lbs | 1050 lb/in |
| 231-280lbs | 1100 lb/in |
Traxxion claims a 1,300 lb spring for a 160-190 lb rider, but they cater to the racer and not the street rider, and even then they tend to be on the stiff side.
The Hawk list and my own experience says that the rates are 1 step too soft, maybe two steps if you're racing. I'm 160 lbs w/o gear and I've got a 1050lb spring on one Hawk, and 1100lb spring on the other, mated with .85 and .90 kg/mm fork springs respectively.