Why Pro teams still using old Dura Ace shifting

[bikemaniack]

I just wonder,why there's still many teams,that didn't using the new DA gearing system,but the "old" one.

What is yours opinion about that.

[Broady]

Lack of availability I'm guessing.

[wpccrunner]

This question has been asked and answered numerous times on the forum over the past 4 months, with the general consensus being what Broady has mentioned above, a lack of product availability in regards to the 9170 Di2. The mechanical 9100 is common on Shimano sponsored teams that use mechanical shifting.