Progressive Suspension 31-4000 Monotube Fork Kit OEM 31-4000 – NEW (BF1)


In stock

Quick Info SKU: 31-4000 Category:


Progressive Suspension High Performance Fork Cartridge Stock – 31-4000

True high performance front suspension is finally available for the HD Dyna line. Progressive Suspension has gone back to the drawing board and created a state of the art Fork Cartridge Kit designed to outperform everything on the market. Their new asymmetrical design places a preload adjuster over a progressive rate spring in one leg and an aluminum bodied, sealed cartridge damper on the other. The result is superior damping and ride control combined with tunable preload and a new benchmark for high performance suspension on the Dyna platform


  • Each kit includes components for stock height or 1in. lowered Dyna applications
  • Adjustable preload
  • Improved Resistance to Front brake dive
  • Improved front end stability
  • Improved Cornering
  • Improved Bottoming Control
  • Sold in pairs

Manufacturer Part Number: 31-4000

Factory Products


(519) 245-9978