It helps to have access to a shop with a selection of cable lengths and that is willing to swap you for the
right cable length. Your install is much neater with cables ~1.5-3" longer than the actual distance
measured, which is not easily done (assumes mostly external wire runs). Also consider using the
MT800 variant of junction A, it gives
you the gear readout and battery life, but does require space on the handlebar. The bluetooth
module that mounts on the R rear seat stay gives the same info if you use a fancy enough
computer, ie it reads out on your computer. Also allow 0.5-7" loop of cable inside the brifter-
do not run the cable straight into the connector, but have a short loop under the rubber brifter
cover.
If junction B is inside the downtube, use up ALL of the plastic cable clip ons Shimano provides around
the B junction and add a few 4 or 6" cable ties snugged around the cable pointing in all directions
(don't cut off the long ends of the cable ties). This reduces the rattling around of the junction B
inside the tube, or just wrap some foam around it, if possible.
Last edited by sch; 09-15-20 at 08:27 PM.