Shimano R8000 Rear Derailleur. New ULTEGRA R8000 series is "pro-proven" as it is a direct trickle down from DURA-ACE. Series ULTEGRA. Shimano brakes, gears, components and cycling accessories incorporate more than 45 years of cycling vigour built into each design; their experience and expertise make them the popular choice of the professional and amateur cyclist the world over.
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