These springs have been extensively tested and proven to be the best for overall 990 performance. Whether you're riding alone or with luggage, these high performing springs accommodates a wide weight range, from a 165lb racer to a 225lb BDR Xplorer. The spring rates start at 15.2kg and smoothly ramps up to 18..0kg, or for those with luggage more often or aggressive riding opt for the 15.4/18.5 providing a plush ride in the beginning and a life-saving support when you push the limits. If you're looking for the best of all worlds in a rear spring, this 990 ADVENTURE CUSTOM REAR SPRINGS  are the ultimate choice for your motorcycle. 
225mm length spring is stock length on most 990's. WP has spacers oem for other lengths.