Shimano RD-7970 Dura-Ace Di2 Rear Derailleur Compatibility and Specifications

Shimano Dura-Ace Di2 RD-7970 Rear Derailleur 10 speed

Like the 7900 mechanical derailleur, the 7970 has a new carbon fiber rear pulley cage and the new design is compatible with wider range cog sets, accommodating up to a 27 tooth cog. The differences are the fact that the unit is now driven by a servo motor instead of a cable and spring, so shifts are identical and precise every time as the computer control unit analyzes each shift.

The derailleur has a built in mechanism that will allow the body to move inward under impact to reduce the potential for damage in the case of a crash. Cycling through the shifting a couple of times allows the shifter and rear derailleur to automatically re-synchronize.

Di2 - Digital Integrated Intelligence - electronic shifting
Titanium B axle
Carbon fiber pulley cage
Programmed motion
Published weight 225 grams
10 speed compatible
Double Compatible

Japan Retail price 64.227 yen (see cross rate here)

Note: DOES NOT works with 11-28 cassette.

Compatible ONLY with Shimano following parts: ST-7970, ST-7971, SW-7971.

Compatible with Shimano 10 speed cassettes: CS-7900 (not 11/28), CS-7800, CS-6700, CS-6600, CS-5700, CS-5600. (does Not work with 11/28)

Compatible with Shimano Chains: CN-7900, CN-7901, CN-6700, CN-6600, CN-5700, CN-5600.

Require to be used with Shimano; SM-BTR1, EW-7970, Double setting SM-EW79F-E (with SC-7900) or SM-EW79A-E or Time Trial setting SM-EW-79F-I (with SC-7900) or SM-EW79A-I.