6870 Ultegra Di2 Vs 9070 Dura Ace Di2

Triathlon Forum
1

Upgrading the TT bike from 7090 Di2 with either Ultegra 6870 or Dura Ace 9070. Can anyone attest to better shift quality in the DA derailleurs? Is the difference down to grams and appearance or does the DA have a little something special over Ultegra as far as shifting?

Thanks

2

IIRC, the RD-9070 has better bearings but it only amounts to 1w or maybe even less than that.