Odd choice they have with springrates. 7kg/mm front and rear. All the other manufacturers have higher rates in the rear compared to the front.
I'm wondering is they are actually coilovers in the rear instead of a divorced spring with an adjustable perch like the other manufacturers use. This would explain the difference in spring rates.
Not sure if this is a good idea or not, as the rear shock towers and mounts may not be designed for that extra load from springs.