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Shimano Dura-Ace Di2 Electronic Rear Derailleur

Shimano Dura-Ace Di2 Electronic Rear Derailleur
$799.99
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This item is not permitted to be shipped, however it can be purchased online and picked up at your convenience.

Details

Ride into the 21st century with Shimano's heralded Dura-Ace Di2 Electronic Rear Derailleur. Instead of a cable and spring, it's driven by a servo motor so shifts are identical, fast and precise every time. The derailleur also boasts a light, tough carbon pulley cage and the chain-wrap capacity for standard and compact cranksets. And, since there aren't any cables or housing to stretch or fail, maintenance is reduced dramatically and durability is increased. Furthering the durability, the derailleur is designed to move inward under impact to reduce the potential for damage in a crash.

An important part of a rear derailleur's job is keeping the chain taut as you change gears. Chain-wrap capacity is a number that tells whether or not a derailleur will be able to do this on the drivetrain you plan to use it on. Calculate chain-wrap capacity with this formula: Chain-wrap capacity = (large chainring - small chainring) + (large rear cog - small rear cog). Example: 53/42 chainrings and a 12-23 cassette: (53 - 42 = 11) + (23 - 12 = 11) = 22-tooth chain-wrap capacity.

Part Numbers

UPC MPN Store SKU
689228278622 IRD7970SS REA43974812E

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