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The rider I know has said that the mud clings to the front cable as it's directly in the arch of the fork, minimizes clearance quite a bit. Plus the cable outer has nearly been worn away where he has gotten buildup during a race. Not sure about the rear end, but I presume it's a similar story when you get build up on the wheel, it's likely to wear at the outer?
I don't have a TCX, so can't speak for them all. Just his experience with it. Great looking bike though.As for routing, my PX SLX routes the cable outside of the arch, with guides down the back of the fork. Seems pretty optimal?
Is it the TCX that has the weird cable run locations. A guy from my club has a Giant and the cable eyelets(?) for the brakes make the cable go through the inside of the fork and inside the chain stay.
Which seems nuts.
As seen here (not his bike):