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With my frame, it's so extreme that the cable has to bend inside the rear stay and back up again.
What size rotor? I wonder if it's possible to get a bigger rotor to allow more clearance for the cable routing.
The last, and very unattractive suggestion is to route it externally from the BB using the zip tie to hold it in place.
edscoble
Soul
The two turns which don't work are the route under the bb and the bend to the calliper itself...
BB shell: The issue here is that the outer housing of the brake cable won't physically fit. The housing is 5.5mm according to google and I suspect the hole it's supposed to go into is around 4.5-5mm meaning that the turn, in combination with the smaller hole, pinches the housing and restricts the cable.
Calliper: This appears to be a common issue with the Hy/RD calliper. The way the caliper is set up, the cable has to make a fairly dramatic bend right at the end:
With my frame, it's so extreme that the cable has to bend inside the rear stay and back up again. This adds too much friction and even when i've been able to force the cable in, pulling it out again (ooo er) reveals a kink at that point where forcing it through has actually bent the cable.