I ordered a Hayes Stroker Ryde from Jenson to go with the brake. I haven’t gotten it yet (and my rotors are still waiting for me up north) so can’t recommend them but the price is right and the main complaint people have with them on bikes is that they aren’t very strong. sounds good to me.
the 7" rotor should be 177.8mm instead of 180mm, but I believe a few washers between the adapter and caliper should remedy the difference. I found one Sinz crank that displaced the rotor up and down a couple mm and added a washer between the caliper and adapter and all was good. Please post your results!
This is the Gusset 180mm front brake as tested on UCM prototype:
Thanks… that was the idea when I’ve choosed a color. And by chance it was a first one proposed by my welder 
A new photo with complete setup as I wanted it. Now just some beautyfiers left, but I haven’t decided yet what to do.
Awesome! Jeff and I love to hear that, and I hope you continue to enjoy the MountainUni disc brake system! Post a pic, let’s see your rig!
Dude, that’s soooo hot! I hope we can have a “customer rig” photo section on the new website… emailing Jeff now!
That brake will be fine, but you will need to pick up a 180mm FRONT adapter from the LBS. they are cheap. Florian said it was ok to run crank spacers on hubs that use the disc brake set up and they can be found here:
http://www.unicycle.com/unicycle-hardware/hubs-and-hub-assemblies/aluminum-isis-spacer-1.html/
8mm preferred, but 6mm spacer will work fine if you move 2 spacers from between the rotor and crank to the outside of the crank. we anticipate selling the crank spacers when the site is up!
Teaser…
the piece of 6061 yielded 58 UCM-1’s! should be done tomorrow afternoon and picking up Monday!
Quad QMD-6
I wrote to the folks at Quad and asked them for dimensions for the QMD-6. They sent me the attached photo.
So, does it look like this would work?
From the dimensions on that photo I would say the QMD-6 should work very well. The brake I modified is sitting at 39.14 for the spokeside measurement. The crankside measurement is 18, and the gap is the same.
For comparison the bb5 I have in my parts bin measures 40.5 on the spokeside. I have a bb7 on my Big Dummy that I can measure tomorrow, but my guess is that it’s a bit wider than the 5 considering it has an adjuster that the 5 doesn’t.
I for one would feel pretty confident picking up a QMD-6 now that I’ve seen the figures.
Photo of my setup with the shift lever drag
Here are some shots of my shift drag/cable caliper setup. You can also see my mount that bolts onto the Nightrider frame. It uses the hole that is already in the gusset, and a piece of heater hose for compressing into the space on the inside of the frame. There’s a second bolt that sandwiches the frame between washers with another piece of heater hose. The bracket itself is made of two pieces of angle assembled to make a sort of S bend.
My plan at some point is to get an old school Shimano DX 1 finger brake lever and put it in line with the shifter so that I have an intermittent brake option. The old DX levers worked in a similar way to the CrossTop levers you can get for CX bikes.
my finished mountainuni 36’er
specs:
kris holm freeride saddle
sinz double drilled 152/125 cranks
mountainuni disc brake
avid juicy 3 caliper
kris holm touring handle
coker tire
nimbus double wide square taper hub
nimbus nightrider square taper frame
Sweet, we have a 180mm Quad QMD-6 on the way for testing, I think ultimately we’ll be selling it! This will work for drag brake apps too! Jtrops set the standard on that one. I think what he did is elegant, minimalist, and cool!
I wonder with the nightrider wide hub and tall rim if the angle of the spokes is greater than on the 29er, I expect it will work on the 36er, unsure of smaller wheels.
I am running a different handlebar and tire, but yours reminds me of mine! I love it! Nice job on the cranks, did you drill and tap or did you have a machinist take care of that? well done either way dude.
I can’t wait to see the upgrade, especially with old school parts! (I have 2 hite-rite springs in their original packaging somewhere)! With a mech brake you can really dial in pad placement and modulation over a hydro set up. it’s trailside serviceable as well! I think we’ll have to carry a lever, cable and housing -or should MountainUni just sell the caliper? (Most folks can figure it out from there!)
this thread seems like a good idea.
One thing worth pointing out that I didn’t mention before is that the flanges on the Coker super wide hub are a little closer together than on the UDC super wide hub. It’s not much, but it’s enough that a nimbus hub won’t work on a Coker frame due to spokes hitting. Even still, it seems like there is ample room with the QMD-6 to allow for the wider Nimbus flanges. That will be the only thing I wouldn’t know from the measurements since I don’t have a Nimbus hub on my Nightrider.
no i got these from you guys!