Convert your WP AER48 or Showa TAC forks to a single sided spring kit with air assist. The best thing about spring forks is the low speed pick up and the only good thing about air forks is the bottoming resistance. We have combined these two systems and used the best of both worlds. The spring picks up all the small bumps and the air kicks in at the end of the stroke to prevent bottoming. We can run a little lighter spring rate than you would normally run allowing for ultimate plushness in the small bumps while using the air pressure to keep from bottoming. This system does not bleed off air like your stock forks, you won't pick up pressure throughout your ride because of expansion, and most of all it makes tuning a breeze. These are as close to Factory as you can get.