Ride JBI has created a YouTube video and reference table for how to identify WP Cone Valve Fork Pressure Spring rate.

WP Cone Valve Fork Tech Specs

• Inner fork tube OD: 48mm
• Damper rod OD: 12mm
• Pressure spring rates: 12-20N/mm
• Fork spring dimensions: 43.5 OD x 480mm long
• Oil height range: 300-420cc
• Oil weight: 4wt or 5wt
• Compression adjuster: 30 clicks
• Rebound adjuster: 30 clicks
• Preload adjuster: 22 clicks (each click is 0.5mm of preload)
• Base valve specs: 6x30x10 (IDxODxH)
• Mid valve specs: 6x23x13 (IDxODxH)

WP Cone Valve Fork Pressure Spring Rate Identification Guide

• 20N/mm pressure spring dimensions
  • Spring length: 114mm +\-1mm tolerance
  • Coil / wire diameter: 4.19mm +\-0.02mm
  • Number of coils: 13

• 18N/mm pressure spring dimensions
  • Spring length: 114mm +\-1mm tolerance
  • Coil / wire diameter: 4.00mm +\-0.02mm
  • Number of coils: 13

• 16N/mm pressure spring dimensions
  • Spring length: 114mm +\-1mm tolerance
  • Coil / wire diameter: 3.90mm +\-0.02mm
  • Number of coils: 13

• 12N/mm pressure spring dimensions
  • Spring length: 114mm +\-1mm tolerance
  • Coil / wire diameter: 3.65mm +\-0.02mm
  • Number of coils: 14