RFY shocks come with an unknown amount of preload. This affects ride quality in several ways. Firstly, preload can generate a force threshold that prohibits initial suspension movement. This can result in a harsh or uncomfortable ride. Secondly, this factory preload makes it nearly impossible to set your sag appropriately. Sag is what helps keep your rear wheel planted during braking as well at times when your wheel is required to travel into bumps or depressions in the road.
The preload modification service fixes the over abundant preload that is prevalent in RFY Shock. For every 1 Centimeter of preload removed there is a combined reduction of nearly 70lbs of force (approx. 35lbs. per spring, 7mm wire). Once this has been performed you can properly set your preload using the built in adjusters that are on every RFY shock. This allows you to customize your suspension sag and ride height to your own needs.
This service is an excellent companion to the RFY Rebuild service, shipping shocks in once to receive both services saves money and time.
For more information, head over to the products page.