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Old 2016-09-17, 08:39 PM   #31
Eric aus Chemnitz
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This is the comparison of forces on the d'break (top) and the UCM caliper (bottom)
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Old 2017-04-07, 04:57 PM   #32
chainreactionphysics
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Got a large vibration when doing steep downhill today. Checked this thread out and made a heath robinson fix.

I used an old cateye light clamp and a bit of metal from an old b**e rack.

Seems to work on light braking - test in anger later.

Stewart
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Old 2017-04-07, 10:24 PM   #33
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Posted elsewhere already, but... another one for the collection. Improved braking massively on my 36er.
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Old 2017-04-08, 03:26 PM   #34
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Posted elsewhere already, but... another one for the collection. Improved braking massively on my 36er.
Is there any connection between the tube and the brake adapter (thread in the tube?)? Or didn't you attach both parts to another because the brake force will always push the adapter onto the tube?
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Old 2017-04-09, 05:34 AM   #35
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Is there any connection between the tube and the brake adapter (thread in the tube?)? Or didn't you attach both parts to another because the brake force will always push the adapter onto the tube?
The bolt is extra long, and protrudes about 8mm beyond the adapter. There's a piece of 8mm diameter aluminium rod about 12mm long which is drilled and tapped and tightened onto the protruding bolt. The strut tube has an ID of 8mm so it fits tightly over the stub. The tubing is bent very slightly to line up the bolt and hole in the frame.

So to answer the question, it is quite securely aligned but is strong in compression only.
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Old 2017-04-09, 08:10 PM   #36
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Secure Rod

Hello lightbulbjim, I like your torque arm ! , how would this action be effected if you drilled and pinned the 8mm x 12mm rod (internal) to the outer tube ? Would the ability to no longer expand cause any vibrations ?

Mark
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Old 2017-04-09, 08:35 PM   #37
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Hello lightbulbjim, I like your torque arm ! , how would this action be effected if you drilled and pinned the 8mm x 12mm rod (internal) to the outer tube ? Would the ability to no longer expand cause any vibrations ?

Mark
I don't think so. Because all the others I've seen so far, including mine, have no ability to expand and all help against vibrations.
http://unicyclist.com/forums/showthr...58#post1673658
I've put a thin layer of rubber between every part (frame - d'brake, brake-adapter - hugo-strut, hugo-strut - frame) but I don't thik it was necessary. Hugo (who built the first of theese) used no rubber at all and was able to eliminate all vibration of his brake with this strut. I've also put a bit of pre-load on mine in hope that it might support the d'brake even better.
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Old 2017-04-09, 10:25 PM   #38
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Hello lightbulbjim, I like your torque arm ! , how would this action be effected if you drilled and pinned the 8mm x 12mm rod (internal) to the outer tube ? Would the ability to no longer expand cause any vibrations ?

Mark
Maybe, but disassembly would be harder and I would have to be careful when tightening the assembly onto the bolt to ensure it ended up in the same position. Having two separate pieces makes this a bit simpler.

The vibration is pretty much under control. There's a small amount of squeal with light braking pressure but once it loads up it's silent.

I'm happy with this for now. The next improvement will be to weld a bracket to the frame, but I have a bunch of house projects which I need to finish before I can play .
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Old 2017-04-20, 08:06 AM   #39
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Attachment 69780

Got a large vibration when doing steep downhill today. Checked this thread out and made a heath robinson fix.

I used an old cateye light clamp and a bit of metal from an old b**e rack.

Seems to work on light braking - test in anger later.

Stewart
Just tested down steep hills - no vibration.

It seems that more people should be suffering with this problem??
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