Weight Weenies

gbrown wrote: ↑

Mon Feb 05, 2018 5:46 pm

I've just bought a new Trek Domane SLR 9 Disc with R9170 di2 and the shop are prepping it for collection. The mechanic has fitted a bar end junction, even though the Bontrager carbon bars aren't drilled, by taking a single di2 wire down the underside of the bar to the right shifter. I popped in today to take a look before the bar was wrapped, and grabbed some photos.

So he's used a single short cable, taken from the under stem junction box no longer being used, to run from the bar end junction, looped it back inside the bar end and squeezed it down the side of the junction box and then looped round and taped it under the bar to run up to the shifter. The bar tape will then completely cover it.

di2barend.jpg

He then used a y-cable to run the long ends between the shifters along the outside of the bars as normal, along with the hydraulic brake cables. The short tail of the y cable will be tucked into the stem, through the opening under the bar and connected to the WU111 wireless unit. The cable from the bottom bracket that went to the old junction box will then also be tucked into the stem so it will all be very neat and tidy.

My first thought was that the cable would be crushed or pinched when squeezed between the bar end and the bar, and turned sharply back on itself, but all seems to work well and passed all diagnostics. Once taped up, it should look very neat.

di2barend2.jpg

Has anyone else done it this way?

Cheers,

Geoff

gbrown wrote: ↑

Mon Feb 05, 2018 5:46 pm

I've just bought a new Trek Domane SLR 9 Disc with R9170 di2 and the shop are prepping it for collection. The mechanic has fitted a bar end junction, even though the Bontrager carbon bars aren't drilled, by taking a single di2 wire down the underside of the bar to the right shifter. I popped in today to take a look before the bar was wrapped, and grabbed some photos.

So he's used a single short cable, taken from the under stem junction box no longer being used, to run from the bar end junction, looped it back inside the bar end and squeezed it down the side of the junction box and then looped round and taped it under the bar to run up to the shifter. The bar tape will then completely cover it.

di2barend.jpg

He then used a y-cable to run the long ends between the shifters along the outside of the bars as normal, along with the hydraulic brake cables. The short tail of the y cable will be tucked into the stem, through the opening under the bar and connected to the WU111 wireless unit. The cable from the bottom bracket that went to the old junction box will then also be tucked into the stem so it will all be very neat and tidy.

My first thought was that the cable would be crushed or pinched when squeezed between the bar end and the bar, and turned sharply back on itself, but all seems to work well and passed all diagnostics. Once taped up, it should look very neat.

di2barend2.jpg

Has anyone else done it this way?

Cheers,

Geoff

bedampft wrote: ↑

Mon Nov 19, 2018 12:04 am

Only problem with this setup is, you can't use extra shifters on one of the STIs.

I'm going to drill one hole near the barend in my Easton Carbon Dropbar tomorrow. Then i'll route one short wire on the outside of the bar to the right STI and the Y-cable between the other STI and the bar end junction. In this case i still got one port left on each STI for extra shifters. But i'm still a little mad that Shimano has lost the sprinter ports on the ST-R9170.