Newbie Di2 question

[floxy1]

Currently running grx 1x mech with a left brake only unit. Getting an 817 Di2 derailleur from Jere and a right di2 shifter to match. Not planning to run satellite or TT shifters.

I want everything to be internal. My Ventum GS1 has headset / headtube internal routing. Using an Enve aero road bar.

My plan is to run the RS910 A junction in the bar, and battery in the seat tube.

Given simplicity of this setup is it still preferable to run a B junction in the BB area or just get longer wire from the A back to the battery and battery to RD?

First time running di2, appreciate any advice. Thanks!

[m_sasso]

Only one connection on the BT-DN110 battery so B junction a necessity and likely lighter

[floxy1]

Originally Posted by m_sasso

Only one connection on the BT-DN110 battery so B junction a necessity and likely lighter

Thanks so A—>shifter—>B—>battery/RD ?

[m_sasso]

Originally Posted by floxy1

Thanks so A—>shifter—>B—>battery/RD ?

Yes, or shifter—>A—>B—>battery/RD

[Look585]

Originally Posted by floxy1

Currently running grx 1x mech with a left brake only unit. Getting an 817 Di2 derailleur from Jere and a right di2 shifter to match.

Note that the shape of the GRX left brake only lever will not match the right Di2 lever. (Ask me how I know...)

[floxy1]

Originally Posted by Look585

Note that the shape of the GRX left brake only lever will not match the right Di2 lever. (Ask me how I know...)

Thanks I was wondering. I’ll pick up a left at some point - good to know. Grx 11 speed coming down in price