As title says, I have a fatbike fork (originally from Luna, IIRC) with standard leftside disc mounts, and a standard (rear) disc compatible wheel (ex-stromer hubmotor), and need a good disc brake that will stop (or at least skid the wheel) a 600lb trike / rider / load from 20MPH.
EDIT for clarity:
I need to know *which* disc brakes would be capable of doing the above, so I can find an affordable source for one. (used or new, as long as I *know* that the used ones actually work. The brakes need to have good enough modulation to be able to simply slow down a little, or skid to a stop, or anything in between, without requiring both hands on a single lever to squeeze it hard enough to do any of those things. (my hands are getting arthritic, and sometimes randomly go numb (but still work, even though I can't feel them), to complicate matters).
(see the SB Cruiser thread for the actual trike and loads in question https://www.endless-sphere.com/forums/viewtopic.php?f=2&t=67833&start=850 )
I'd prefer cable-operated rather than hydraulic, because I can fix cable stuff roadside when inevitabely something goes wrong.
I broke my "good" suspension (worked, at least) fork's crown (and bent the steerer tube) in a collision, and I need to replace it with something other than the piece of junk spare I have on it at the moment.
The best fork I have right now is a nonsuspension fatbike fork
which I want to use, because I have a rear DD hubmotor (from a Stromer) I intend to use on the front of the trike for a regen brake and redundant traction motor. (I have to make "torque plate dropouts" to bolt to the outside of the fork's dropouts, since the actual dropouts are insufficient for motor power, *and* are not wide enough by about 6-7mm; I could probably bend the steel fork wider, but still need torque plates/arms, but this is relatively simple to do).
View attachment 2
I've been pondering ways to make rim brake boss holders to put the arms close enough to the rims to work, and will try that if there isnt' a disc brake I can get at a reasonable price (I'd also have to change the rim on that motor to use rim brakes). But right now, I'm willing to throw money at the problem.
I also would like to add brakes to the rear wheels, but the frame isn't built for it right now, and would require significant modification to work, *and* one of the motors doesn't have a disc-mount cover anymore (had to remove the mount for a wiring fix), *and* the future axle replacement I'd like to do may not fit thru a bike disc rotor hole (leaving MC hydraulic discs as the only disc option I can think of).
(regarding adding the rim brakes, essentially I'd be taking the U-shaped section from a "normal" suspension fork, that has the brake bosses on it, and making a "box" that can be hose clamped (or some other form of clamp that prevents rocking and rotation) to the inboard side of teh fatbike fork legs. The U would then be welded to the front of the box. A second U would be welded to teh back fo the box, bosses pointing backwards, but at an angle that meets the rim correctly (unlike my present double-U brake setup on the previous forks, necessary to get sufficient braking to skid the wheel and/or stop the trike in a useful distance).
With some of the U's I have, like the one above, tehy might be able to be directly welded (or clamped) to the fork without intermediate hardware, for the front...but I still need something for the back one to make it sit at the correct angle for the bosses to be parallel to the rim curvature there).
(note: changed to more appropriate title)
EDIT for clarity:
I need to know *which* disc brakes would be capable of doing the above, so I can find an affordable source for one. (used or new, as long as I *know* that the used ones actually work. The brakes need to have good enough modulation to be able to simply slow down a little, or skid to a stop, or anything in between, without requiring both hands on a single lever to squeeze it hard enough to do any of those things. (my hands are getting arthritic, and sometimes randomly go numb (but still work, even though I can't feel them), to complicate matters).
(see the SB Cruiser thread for the actual trike and loads in question https://www.endless-sphere.com/forums/viewtopic.php?f=2&t=67833&start=850 )
I'd prefer cable-operated rather than hydraulic, because I can fix cable stuff roadside when inevitabely something goes wrong.
I broke my "good" suspension (worked, at least) fork's crown (and bent the steerer tube) in a collision, and I need to replace it with something other than the piece of junk spare I have on it at the moment.
The best fork I have right now is a nonsuspension fatbike fork
which I want to use, because I have a rear DD hubmotor (from a Stromer) I intend to use on the front of the trike for a regen brake and redundant traction motor. (I have to make "torque plate dropouts" to bolt to the outside of the fork's dropouts, since the actual dropouts are insufficient for motor power, *and* are not wide enough by about 6-7mm; I could probably bend the steel fork wider, but still need torque plates/arms, but this is relatively simple to do).
View attachment 2
I've been pondering ways to make rim brake boss holders to put the arms close enough to the rims to work, and will try that if there isnt' a disc brake I can get at a reasonable price (I'd also have to change the rim on that motor to use rim brakes). But right now, I'm willing to throw money at the problem.
I also would like to add brakes to the rear wheels, but the frame isn't built for it right now, and would require significant modification to work, *and* one of the motors doesn't have a disc-mount cover anymore (had to remove the mount for a wiring fix), *and* the future axle replacement I'd like to do may not fit thru a bike disc rotor hole (leaving MC hydraulic discs as the only disc option I can think of).
(regarding adding the rim brakes, essentially I'd be taking the U-shaped section from a "normal" suspension fork, that has the brake bosses on it, and making a "box" that can be hose clamped (or some other form of clamp that prevents rocking and rotation) to the inboard side of teh fatbike fork legs. The U would then be welded to the front of the box. A second U would be welded to teh back fo the box, bosses pointing backwards, but at an angle that meets the rim correctly (unlike my present double-U brake setup on the previous forks, necessary to get sufficient braking to skid the wheel and/or stop the trike in a useful distance).
With some of the U's I have, like the one above, tehy might be able to be directly welded (or clamped) to the fork without intermediate hardware, for the front...but I still need something for the back one to make it sit at the correct angle for the bosses to be parallel to the rim curvature there).
(note: changed to more appropriate title)
This would also require me to change the non-rim-brake-compatible rim on the hubmotor, or else just use a regular rear wheel that already uses a rim-brake-compatible rim, until I can get that done...and part of the reason for doing this fork change is to allow the use of the hubmotor in front as a backup motor and extra regen brake. (If I have to relace the wheel, I might as well put it in one of the 20" rims and stick it on the back in place of an MXUS when one of the axles breaks again)
Before the fire I had a crappy fork like that, which Iw as going to use the crowns from with legs from something else or making my own, but like quite a few other things, someone else thought they should have it, before the house was redone and I could move back in. 
Don't think I'll have a problem with *those* bending under load. :lol: