Technical & Reference Section > Tech and Restoration

Dia-Tech AD999 Chainstay version on seat stay?

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Wayne Ryder:

--- Quote from: Gary72 on March 06, 2009, 11:15 PM ---
--- Quote from: S&MAlex on March 06, 2009, 12:24 PM ---The whole angled arm thing is crap. Straight arms are much better.
All the angled arm does is hide the fact that there is a big kink in the cable alignment.
It does nothing to solve it  :tickedoff:

--- End quote ---
Have you got your inventing cap on again Alex?

--- End quote ---

Alex is giving the official stamp on doubts I had as soon as angled arms started appearing. George had the solution years ago, angled mounts.
It must be hard to come up with one angle to suit all frames, so it's probably easier to just mount them squarely on the tube. Also, it gives brake makers (who are often also frame makers -coincidence?) a new pitch to draw in the punters. Seems to work, too.

Gary72:
I'm no engineer, but I would have thought that having the kink/bend in the stronger brake arm is better than having the cable kinked. At the moment I have a hombre on the chain stay and was thinking of getting one of these angled 999's and using a spoke as the bridging cable like I have seen (JT71, Harris). I have no hole through my seat tube. At the moment you can see that the cable would be pulling up on the brake arms as it does not run straight into the arms.
Hope that kinda makes sense :-\

Stella Dave:

--- Quote from: Gary72 on March 09, 2009, 10:21 PM ---I'm no engineer, but I would have thought that having the kink/bend in the stronger brake arm is better than having the cable kinked. At the moment I have a hombre on the chain stay and was thinking of getting one of these angled 999's and using a spoke as the bridging cable like I have seen (JT71, Harris). I have no hole through my seat tube. At the moment you can see that the cable would be pulling up on the brake arms as it does not run straight into the arms.
Hope that kinda makes sense :-\

--- End quote ---
It does, I wondered exact same but then with angled will the cables rub more on the frame mount?
Have ordered these anyway, and some flexible noodles for the front.

pickle:
you'll have no problems with it.....superb brake and cheap as chips!  :daumenhoch:

SaMAlex:

--- Quote from: Gary72 on March 09, 2009, 10:21 PM ---I'm no engineer, but I would have thought that having the kink/bend in the stronger brake arm is better than having the cable kinked.

--- End quote ---


The problem is that the cable is pulling at an angle from the brake mounts. It makes no difference if the cable or the arms are kinked, you are still pulling from above (or below) the mounts, rather than in line with them. The kinked arms spread (hide) the bend. Some of it is at the arm, some is at the arm/cable junction, and some is at the cable/cable stop junction. Staight arms only spread the bend between the two cable junctions, which makes it look more obvious. They are both EXACTLY the same: the cable is pulling at an angle from the brake mount.

Angled arms do stop the cable junctions from having all the bend, so the cables might last longer, but there is still power lost from the lever. Mounting the cable outer stop at an angle is a big help, and Angled brake mounts help loads too, but they do look very strange.

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