ESA makes suspension settings simple to understand and quick and easy to change. ESA:

• is an option on many BMW models and most late model R1200GS's
  
• displays the current settings on the info flatscreen
• is easy to use - just press the ESA button
• is very intuitive - you should only need to be shown how to use it once
• makes it possible while riding to adjust suspension in two ways:
  • Preload - can only be adjusted while stationary with the engine idling such as while at traffic lights. *
  • Damping - can be adjusted while riding.
  But just what settings suit you!, read the ESA article on the Usefull Links page to learn more