Suspension101 spring sets - 43.5 OD x 450mm length springs.
The Norden Expedition comes with 460mm springs and wp adds 4mm spacers.
This equates to 19mm of spring preload or squeeze on the springs.
Reducing this preload will enhance plushness especially in small chop rocks and washboard terrain.
Our springs are 450mm long reducing the preload to 5mm to 9mm. This allows the fork to move easier in inital contact hence the improved ride and performance.