The Shimano Ultegra 6701 chain features redesigned inner and outer plates for better contact with the teeth of the cassette cogs. This improves power transfer and shifting especially when under load. The new shape of the outer plate virtually eliminates chain suck.
Rear shifting is enhanced thanks to a newly-shaped inner plate. Weight is reduced by 8 grams versus the 6600 chain. The 6701 chain works on all 10 speed Shimano drivetrains.
Please note: the 6701 chain is directional like the 7900 so it must be installed in the correct orientation