Fork tube cap YSS FCM34-39-002-90 adjustable pair

Pair of YSS fork spring preload adjuster caps: made from CNC machined billet aircraft aluminum. YSS fork caps replace the stem caps on conventional forks. Thanks to these fork caps, it is possible to finely tune the preload of the fork spring according to the rider's riding style and motorcycle set-up: adjusting them increases or decreases the mechanical preload of the spring and thus the stress on the fork spring. In this way it is possible to fine-tune the adjustment of the fork spring push: depending on the adjustment of the adjusters you will then have a stiffer or softer front end.

YSS spring preload adjuster dimensions:

• fork tube compatible: outer diameter 39mm
• fixing: thread M34x1.5, length 17.5mm, wrench 19mm
• adjusting wrench width: inner 6mm, outer 12mm
• spring plate: diameter 29.5mm
• preload: travel 10mm