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What is best design to route rear brake cable via toptube?(5 posts)

What is best design to route rear brake cable via toptube?Fez
Aug 25, 2003 11:53 AM
Years ago the invisible (hole thru toptube) was common. Don't see that anymore.

Is along the bottom of the toptube the best location?

And should it be bare exposed cable or should it be housed in a protective sheath along the entire length of the toptube?

I have seen entire paintjobs messed up from the bare cable rubbing against the toptube.
re: What is best design to route rear brake cable via toptube?JS Haiku Shop
Aug 25, 2003 12:00 PM
cable location is often dictated by design of the bike. for instance, my look frame has cable routing mounts underneath the tt; they are of a size to route full cable & housing. my merckx has internal rear brake cable routing. my surly 'cross bike has it on top of the tt, exposed (no housing); the steamroller has it underneath the tt, housing all the way, zip-tied to the tt (no routing mounts).

depends on the application, too; do you often carry the bike by the top tube? how about on a trunk or hitch rack? a "yes" to either would indicate a preference for above-tt routing. how's it stored at home?

also keep in mind the rubber donuts you can get from LBS or supplier--they are created to fit spaced evenly along bare cables, intended to keep the cable from contacting the frame.

not sure i've seen a "best" way per se, just ways that are more suited to different applications.
Last two road bikes have had internal routing . . .Look381i
Aug 25, 2003 3:20 PM
Guerciotti Neuron and Look 381i. Works fine, if installed correctly. I like the clean top tube. My son's Colnago runs below tt; my Redline crosser runs on top. Easy to see and service, but more likely to get caught on something, make noise, scratch finish, etc.

No opinion on what's "best."
Below and to the left, open (nm)Kerry Irons
Aug 25, 2003 4:56 PM
What about Compacts?timfire
Aug 25, 2003 7:20 PM
I know that the roadie-thing to do is route the cable below and to the left, but the other day I was looking at a compact frame (a Giant, if it matters). And I was noticing that the design was such that the top-tube/seat-tube/seat-stays joint placed the back-brake really close to the top-tube. The significance of this is that the brake cable had to bend upwards before it could curve back down and into the back brake. It was really ugly. I was thinking that if the cable had been routed along the top of the top-tube (like on most mtb's), it would help smooth things out alot.