That is a place to start, but more info is needed.
0.7-0.9kgf/mm progressive spring translates to what spring rate on a linear spring? What weight on rider and bike are these springs suppose to match?
The springs I am thinking of getting are not progressive, but linear.
_________________
MC21, GP-Replica (Daijiro Kato, Telefonica Movistar Team 2001)