I had seen that, but the lb rates seem very stiff compared to those offered by both Losi & Associated for Off Road.
The Assoc blues I have just got are the hardest they do and are rated at 4.2lb, with the stiffest rears at 3.03lb , Losi seem similar.
According to that table the lighest K springs are 7.4lb going up to over 9lb

. This seems wrong to me that the other major players are virtually identical in their offerings and Kyosho start on that chart way, way above anything else.
I did e-mail Kyosho Uk but all I got back was a list of springs available with the kyosho rating which doesn't mean anything