Spring for Kayaba fork 380mm, 25lbs, 0.44kg/mm

Spring reinforced to harden the forks of the Kayaba 85YZ/KX/RM used on pitbikes.
Recommended to use a standard Kayaba spring and one increases to get a good compromise for drivers from 65 kg to 90 kg
Adapted for fork of 85 MX whose travel was first reduced from 50 mm for use on a pitbike