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Shimano Ultegra 11-Speed Di2 Rear Derailleur

Shimano Ultegra 11-Speed Di2 Rear Derailleur
  • Model: Short Cage
  • Model: Mid Cage
$230.00
Model:
Mid Cage
Please select options
NOTE: "In store" availability on bicycles includes bikes fully built and bikes still in boxes. Please contact us via the live chat icon at the bottom of the page or call us at (303)444-4196 to confirm build status. ----------------This item is not permitted to be shipped, however it can be purchased online and picked up at your convenience. We are currently also offering City of Boulder Home Delivery for $10 on any purchase under $100 and free for anything over.

To use our $10 Local Delivery service, select it while viewing your cart or during the checkout process.
Please call us at 303-444-4196 with any compatibility questions! We are always happy to help.

Details

Shimano's electric-shifting 11-speed Ultegra Di2 Rear Derailleur is driven by battery power and a servo motor, so shifts are fast, precise, and perfect every time. It's made of light, tough cold-forged aluminum while mid-cage and short-cage models give you your choice of cassette. Since there aren't any cables or housing to stretch or fail, maintenance is dramatically reduced and shifting accuracy is unprecedented. This high-tech derailleur is even 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: 44/29 chainrings and a 11-28 cassette: (44 - 29 = 15) + (28 - 11 = 17) = 32-tooth chain-wrap capacity.

Part Numbers

Option UPC MPN Store SKU
Mid Cage 689228930551 IRD6870GS 210000021389