We use our same micro finish process that we use on our Optimized Chains on the races to reduce friction and add longevity to the bearings. You can pay three times as much ...but its just additional margin ....not additional quality.
For Shimano rear Derailleur
90XX (Dura Ace), 68XX/R80XX (Ultegra) series
Max Gear Capacity 30T
Smallest Gear Capacity 11T
Step 1 * Remove original cafe and pulley wheels from Derailleur.
Step 2 * Choose your spring tension position, Install spring into spring tension hole, Set the cage at the correct position and install cage stopper pin.
Step 3 * Install the outer plate and cage stopper pin.
Step 4 * Install the pulley wheels and inner plate.
Note: This system works for Mechanical and electronic systems.
Warning: To install the Ultra Glide Kit, we strongly recommend that you use a trained bicycle mechanic at your local bike shop. Please install a new chain or continue to use Premier's Ultra Optimized chain.