Triumph Street Triple 765S Sigma Slipper ClutchTriumph Street Triple 765S Sigma Slipper Clutch Supersport legal.. Many less expensive bikes have missed out on the benefits of slipper clutches. We can now improve corner entry performance and stability and combine that with more grip. The clutch uses standard springs (preferably new) and the standard clutch pack. The clutch provides all the normal slipper clutch benefits with better over rev protection and improved chassis stability going into