Here is a Shimano Ultegra rear derailleur. Model RD-6600. Short cage. Nice used condition. Pulleys and cage were removed and cleaned. Some marks as shown.
Its smaller, sleeker design reduces frontal area compared with previous generations for a cleaner look and reduced aerodynamic drag. GenuineShimano Ultegra FD-R8150 Di2 front derailleur. Fast, seamless Di2 front shifting.
Despite its smaller construction, the system is quieter than ever and easier to maintain. This kit includes both left and right ST-R8170 levers, two BR-R8170 disc brake calipers, and 1700mm of front & 1000mm of rear hydraulic line.