Nimbus D-brake -vs- Mountain Uni UCM brake mounts

[saskatchewanian]

Originally Posted by mowcius

You can't? I thought you just needed to use a 160mm front adaptor?

I was getting a unicycle prepped for a trip, Shaved down a d'Brake to use it with a Schlumpf and KH cranks. I was originally going to use a 180mm disk like I usually do but both my spares seemed to have disappeared. I "borrowed" the 160mm disk from my bike and when I tried using the 160R/180F adaptor flipped there were clearance issues at the bottom. I could not find my 160F adaptor, It was probably with the disks and a few more odds and ends I seem to be missing. It fit fine on the UCM.

I had thought that I had run a 160mm disk before so was surprised. You are probably right that I just needed the 160F adaptor.

Between the UCM, the d'Brake, and the custom Triton frame I had I don't necessarily remember all the combinations I have tried.

[Vogelfrei80]

I find interesting this thread...
[OT]
What's mountain uni site to buy?
Someone spoke about square cranks with disc brake... where I can buy one?!? Does exist Sinz 125mm square-cotterless crank which could fit a disc brake? Where to buy in Europe?[\OT]

[caseytronic]

Mountain Uni doesn't have an active website anymore. there are some old pages here:

http://mountainuni.blogspot.com/


I believe Jeff, who runs it, may have some parts (UCM, Cranks, Discs) still available. I will PM you his email.

[lightbulbjim]

Originally Posted by Vogelfrei80

Someone spoke about square cranks with disc brake...

This may present a challenge because a square taper spindle doesn't have a hard stop for the crank. In other words each time you remove and replace the crank it may end up in a different lateral position.

I know square taper disc brakes have been done in the past, but the lack of stop alone would sway me away from using one over an ISIS setup.

[Vogelfrei80]

Thank you all for your precious help!

[twelf]

Thanks for the help. Learned lots just by reading here.

[UniMyra]

Due to strong vibrations (unicycle turned in to a giant vibrator) on braking I had to do something to enforce the d'brake, so thanks for the tips in this thread. I used patentband which was what I had lying around. It's not ideal because it is soft, but with 3 lairs and bolts to hold them together it worked well. When I fitted the d'brake to my KH36, I had to use 3 washers between the brake and the D'brake to get the brake centered over the rotor. I think this may have increased the vibrations. The patentband was exactly the same size as the washers, so I could just replace the washers with the patentband. I went for a 23 miles ride yesterday, and the braking was very smooth on the steepest decents.

A few months ago I bought a d'brake for my KH36, but the bolts were not flush with the d'brake. The one on the bottom was too close to the spokes because it was sticking out. I replaced it with and older version of the d'brake that I had on an Oracle 24, which is the one in the photos. Vibrations was never an issue with any of my Oracles (24/26).

[mowcius]

I had similar issues with bolt head sizes and the d-brake - I had to dig around in my parts box to find some that were just small enough to fit in.

Just a quick update on my strut - I'm now on version #4 but this one's been holding up well for a while so I've painted it to match