Quote:
You are missing a splitter,He isn't if he's ok with running dual leads out of the Junction A to the bike proper, and if he's running a dual button shifter.
Bar end shifter > Junction A >Battery
Junction A > Rear Shifter
Tech writer/support on this here site. FIST school instructor and certified bike fitter. Formerly at Diamondback Bikes, LeMond Fitness, FSA, TiCycles, etc.
Coaching and bike fit - http://source-e.net/ Cyclocross blog - https://crosssports.net/ BJJ instruction - https://ballardbjj.com/