I have since routed the rear brake cable the standard way. With the TriRig brakes especially, I found the braking to be too mushy, despite having a great mechanic redo the cabling. The braking power was fine, but I like to feel I can trust the equipment, and I didn't.
Standard routing is stronger and more reliable. Plus I can fix it easily myself. The internal routing is a pain and forces the cable to do some sharp turns.
Just shorten the cable so you don't have a mega loop sticking out... It's only a micro watt difference anyway ;)
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