Shimano Dura-Ace RD-7900 Rear Derailleur

Shimano Dura-Ace RD-7900 Rear Derailleur

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Some rear derailleurs snort, snicker, and flat-out refuse to comply when you think about choosing a 50/34 crankset and a 12/27 cassette. Not the Shimano America Dura-Ace RD-7900 Rear Derailleur. The RD-7900 has an expanded chain-wrap capacity so you can use it with any combination of Dura-Ace cranks and cassettes (including a combo of 50/34 and 11/28). What else is rad about this piece? Shimano America made the pulley cage and P-body with carbon fiber so this derailleur weighs in at a modest 166g. And of course, the 7900 shifts with the smooth, consistent accuracy you expect from Shimano’s highest-level road-component family.

Model Number RD-7900

Series DURA-ACE

Cassette Compatibility 10-speed

Maximum Sprocket 28T

Minimum Sprocket 11T

Maximum Front Difference 16T

Total Capacity 33T

Guide Pulley sealed bearing

Tension Pulley sealed bearing

Bracket Body cold forged aluminum/anodized

Bracket Pivot Seal double O-rings

Plate Body engineered plastic/painted

Plate Pivot Seal single O-ring

Outer Link cold forged aluminum/anodized

Inner Link cold forged aluminum/anodized

Link Pin Bushings fluorine coated (4)

Outer Plate carbon

Inner Plate carbon

Average Weight 166g