These BMW R100 / R80 (and other R series models) YSS suspension replacement rear shock absorbers from the Ecoline range, are a high efficiency gas shock absorbers that can be adjusted according to the user. Note that these are suitable for the R series monolever set-up only. for dual shock arrangement visit our other range of YSS Shocks. There are 3 main features to this shock: 1. It has a threaded preload adjuster which the user can turn in order to personalize their setting. 2. It has rebound adjustment. 3. The shocks are completely serviceable. There is also the option to fully customise the look of your BMW R series shocks in a number of ways via our partner in Netherlands – YSS Suspension Store. Check out the options below: This shock is 410mm in length and is the standard length for this application. Note that each shock is custom built to your specification and takes about 10 business days to process.