Saturday on the way home from work something large and metal fell off the back of a truck full of junk as it passed me, and went under my left wheel before I could do anything about it, and damaged the tire; I was forced to ride the remaining mile and a half or so on the flat, with four broken spokes. Surprisingly the rim itself wasn't apparently damaged; all previous road-debris/condition encounters have damaged the rim and not the spokes (and sometimes the tire but not like this).
Sorry I'd already taken the tire off to see if I could save it before I took this pic, and I swear I took pics of the tire inside and out but they're not on the phone, so I must've not quite pressed the shutter button (it's wierd, that under some circumstances I haven't identified, if you tap the button it takes a pic, and other times it has to be held down until the screen blinks. Doesnt' matter what mode the camera app is in, flash settings, whether it's already "focused", lighting conditions, etc...just, sometimes happens, sometimes doesn't, but loses pics I intended to take.

).
Anyway, here's the motor, off the trike; you can see the places for the missing spokes--one of them is still hanging there. Tapping the other spokes with a wrench, some of them don't "ting", so they're probably broken, too, inside the nipple. I probably don't have enough spares of the right length to fix this wheel with new spokes, but I think I still have the other heavily-modified MXUS 450x in it's badly damaged rim that I might be able to move spokes over from to make this a functional spare wheel.
However, I think I'd rather use this rim to lace onto one of my other Ultramotors, after I fix them. One, another ex-A2B version, has scratched up winding insulation (was shipped disassembled and it's cover or something else in the box scraped them up), I think I can fix that with CoronaDope
but I'd have to order more (mine dried out--apparently the lid split open while sitting in the drawer?). The other UM is my original one off a Stromer, that I gutted the dead controller out of and cabled it up for an external, and ran it for a long time on the SB Cruiser, until I finally broke it's axle at the shoulder where the flats meet it. I could just weld that piece back on, and probably keep using this another long while. Or see if it's possible to pull the axles out of both and swap. (probably wouldn't do this).
In the meantime, since I already had a new spare rim and new spokes and spare working Ultramotor, and had already planned to do this whenever the time and energy happened simultaneously, I decided to change the entire wheel out now.

Actually installing it didn't work out so easily. I had measured everything, I thought, back when I planned this. But I missed the centering of the motor on the axle, so this one is offset differently than the MXUS was, and things don't line up, like the freewheel, and I'd forgotten that the MXUS had had a broken axle and I'd had to weld it on, and in the process shortened the shoulder, narrowing the space between the dropouts, so the unmodified UM doesn't fit, by over 1/4".
What I wanted to do was cut and modify the frame and outer dropout to match the style / etc of the rightside clamping dropout, but with all the other stuff that didn't work as planned (see below) there just wasn't time or energy to do it. So my options were narrowed to grinding the axle (which didn't want to do, but is "recoverable" in that the clamping dropout will take care of that later) on the outboard (disc) side, so that it will fit between the existing dropouts. Because of the way they made this axle, this means there's no shoulder now to fully support the axle against the dropout's inboard face, so I also used the plastic tube that comes with the UM to help keep the motor away from teh dropout face so the motor cable (taht runs along one of the flats) so it doesn't get damaged by the motor.
The next complication was that I simply can't get the freewheel off the MXUS to move it over. I tried everything except disassembling it; the Park tool I have for the purpose just wont' stay engaged with the very very short lip on this one. I tried filing the notches deeper but the metal is just too hard for my crappy little files, and the big good ones I have cannot get in there because the axle is in the way. I'd have to take the cover off to do it, and this was all getting too complicated and taking way too much time, so I had to go with another singlespeed freewheel I had.
But it's two teeth smaller, so the chainloop that connects it to the output of the trike's pedal drivetrain is too long, and won't tension up with the short distance availble in the dropout slot (this is why the slot is angled, unlike the upright vertical slot on the other side). Like that, it could derail on the bumpy roads and come off the sprockets--even a little bit would be a problem, either jamming the chain, breaking it, or damaging hte sprocket teeth, etc. I don't have any half links, so i had to take two links out, and that makes the chain so short that the wheel cannot go as far up as it should (nearly an inch short of the spot it should be in).
So....every complication just leads to more complications.

What should have taken a couple of hours, maybe three, including lacing up the wheel, took more than twelve, and left me exhausted, and other stuff (yard work, etc) I needed to get done left undone. And I still wasn't finished, because once it was finally all installed, I had problems with the controllers not doing what they should, etc. See below for a link to a thread for that mess.
The plan had been to just swap the wheel out and run it off the Grinfineon as the MXUS had been, but the Andersons on the cable with the UM were apparently so poorly crimped (from factory?) on the controller-side cable extension that two of the contacts and shells just fell off as I was lacing the motor into the rim.

Since I was going to have to redo the connectors anyway, I thought "hey, why not try out that old PR v1"...but things didn't really go as planned from there, either.
Troubleshooting details and whatnot over here
So...this is probably going to be complicated, and requires some explanation of the setup, both as it is now where it doesn't work right, and as it was before when it did work fine. So...apologies for the length. I'm very tired after working on this for the last 12+ hours, so I'll probably...
endless-sphere.com
along with the solution.
Eventually I got it working, and so now I'm running two similar (but for some reason not identical?) ex-A2B Ultramotors, each run by a Phaserunner. The leftside UM is run by a v1, from LewTwo via FuzzyWuzzy (thank you both), the rightside UM by a v6 (thanks to Grin Tech, ebikes.ca). The two motors are different windings; info below is from the PR suite autotune.
-rightside ultramotor 102.0mohms 571uh 8poles 8.81rpm/v
--this leftside ultramotor 76.0mohms 394uh 9.21rpm/v
I don't know what the info is for the other two UMs (the other A2B and the Stromer), I wonder if either matches either of these? If one does, I'd like to build that one into a wheel and get a matching pair on the trike (thought I was already doing that...but guess not).
Performance appears to be about the same this way as it was with the GF/MXUS on the leftside, except that regen braking now is only available below around 10mph or so. Before, the GF gave all it could give from any speed, so I always had *some* ebraking, but the PRs (v1 and 6) just don't provide anything at all until the speed drops below this point, and after that it kicks in fine, at whatever strength I'm asking for with the variable lever; it's strong enough then, all the way to zero speed.
As noted in that thread above, there's no settings for any such speed limit or point in the PR that I can find so far, so if anyone knows of one, I'd love to hear about it.
There's also still a potential intermittent issue on the rightside PRv6 / UM combo (see that thread for details) but it is working now so not messing with it till it doesn't.
Since I generally only need one spare controller on the trike (just in case), I removed the two generics to clear space to mount the PRv1. I wanted to use the same aluminum L-bracket (rack ear) style mount that I used for the v6, but I didn't have time and energy to dig thru stuff to find the second one I know I have, so instead I used a 1/4"+ thick aluminum plate that I did know where it was easily accessible. If I run across it I may swap it out to put it on the frame the same way as the v6. No idea when that might be.

I simplified the wiring a bit by removing all the stuff the other two removed controllers had to the harness, but it's still available to connect to if I need it (like the reverse wires that go up to the horn button on the handlebars, and the brake on/off wiring that goes to the relay activated by the variable lever). Someday I need to really clean up that mess down there; all the experiments and repairs since 2018 or so when I redid that wiring the first time has done in my nice neat wiring job pretty good.
Some of the test wiring during the troubleshooting, showing the one working combo I could get with the GF and the UM:
So, after all that, it's working now, but I still have required work to do on it, like making the clamping outboard dropout, etc. That's a few more hours of work I have to do, earliest I can do it is next weekend.
Hopefully nothing else will go wrong before then. (did I say that out loud?

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