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  1. DanGT86

    FLIPSKY new 20s 100A tiny controller (vesc based)

    Is there a way to quickly switch between profiles with a button or do you have to reload the profile each time with the app?
  2. DanGT86

    Strong freewheeling crankset

    The only ones I know of for sure in the US are on the shelf in my basement. They were used when I got them but I can probably ship them to you for $50 WebCyclery is the only US vendor I can think of that sells trials cranks with freewheel threads but there are no square taper cranks on their...
  3. DanGT86

    Strong freewheeling crankset

    I have seen them around on different bike trials vendor sites. These are available in 140mm and 160mm and are square taper. https://www.trial-bikes.com/en/comas-jis-130mm-cranks-p-538194.html...
  4. DanGT86

    Scooter hub motor 36v

    I have 2 of them from another source but they look identical to these ninebot motors. Mine are just a typical hall sensored brushless motor with 3 halls 3 phases and 5v and ground.
  5. DanGT86

    Scooter hub motor 36v

    This seems like a good price for a scooter motor. https://jag35.com/products/es4-escooter-8-wheels-w-motor?_pos=1&_sid=c2fa6abf4&_ss=r
  6. DanGT86

    Engineering ? Drag from Tensioner vs jackshaft

    Thanks for the replies. I had a gut feeling a lot of the losses were from the interplay between chain and loaded teeth rather than just the amount of sprockets and bearings. My biggest objection to the jackshaft route is that there is not room to get much reduction done at that spot. Its...
  7. DanGT86

    Engineering ? Drag from Tensioner vs jackshaft

    I know gear reductions through a jackshaft add losses to a system through drag but how does that compare to a single stage with a tensioner? I am trying to compare 2 similar designs. One design uses a jack shaft to locate the final drive to the pivot point of the bike's suspension to eliminate...
  8. DanGT86

    Sur-Ron - New Mid drive Bike

    I agree with Chalo. A few electronic upgrades to a sur-ron can give you an abundance of torque. It just seldom worth the complexity of the multispeed. If some design constraint forces you to use a very small motor AND you need a huge difference in operating speed then maybe its worth...
  9. DanGT86

    Newbe Duel drive controller

    I don't know how you could run 2 motors with one controller. There are some controllers that are designed to drive 2 motors. They are essentially 2 controllers in the same physical enclosure. If its something like that you would want to send 750 watts to both motors since that would more...
  10. DanGT86

    Newbe Duel drive controller

    Power ratings on motors are always a bit of an estimate based on use case. A manufacturer might call a motor 750watt meaning they intend for it to tolerate 750 watts continuously under normal use. That same 750 watt motor run at 2x the voltage in a smaller wheel might do peaks of 3000watts so a...
  11. DanGT86

    Thoughts on sram maven ?

    They are probably up to the task of slowing a heavy high speed bike. I feel like being larger overall they will deal with heat better than calipers using less material. The pads are also significantly larger than most. Personally I will never forgive SRAM for the Juicy and Elixer brakes they...
  12. DanGT86

    Run two motors on one controller? Maybe?

    If the 2 motors were identical and you synched the stators together mechanically such that the timing would be perfect then you could probably get away with it. I would not try it with unmatched motors through a chain. Controllers are very cheap. You would be a lot better off using 2...
  13. DanGT86

    The throttle signal to a motor controller (specifically: hacking it)

    A cycle analyst from ebikes.ca would modulate your throttle for you. It has a wide range of methods to control the throttle signal. It would be annoying to have 2 displays but you could probably run the Cycle Analyst between your display and throttle or between the display and controller...
  14. DanGT86

    Is there a need for 2 torque arms

    I believe it does. I have an old marzocchi fork from the early 2000s with 9mm slotted drop outs. When I brake hard the 2.5" wide tire leans over and rubs the lower. I do not see how the single sided braking action could not apply a twisting force to the lower.
  15. DanGT86

    Is there a need for 2 torque arms

    I can see how hub motors would put a lot of force on the dropouts that they weren't designed for. I can also see how braking forces are not on the drop out and are not twisting the axle. The part I am having trouble believing is how braking forces to a bike in motion parallel to the ground...
  16. DanGT86

    Is there a need for 2 torque arms

    Arent braking forces on a fork 10x what a motor will produce? The caliper mount is on the lower and the weight of me and the bike are on the upper. Seems like fork bushings are made precisely for these type of forces.
  17. DanGT86

    Observed trials bike designing

    It was a couple of firmwares ago but I was given a bunch of different PID settings from the Nucular team to try on a motor that had some stutter to it. I don't know if you are suggesting that those settings are nolonger there or that they don't actually do anything. I can say for sure that...
  18. DanGT86

    Sold: Geared Hub motor 27.5" wheel

    If you are 100% sure that you are going to re-lace it then I can take the wheel apart and save you some shipping costs. Shipping is $30 without the spokes and wheel and $50 with the whole wheel as is.
  19. DanGT86

    Observed trials bike designing

    It will be interesting to see how the torque sensor interplays with the suspension action pulling on the chain. I guess ultimately torque is torque whether its the motor moving the bike forward or resisting the suspension pulling on it. I have wondered about this regarding mtb trials moves with...
  20. DanGT86

    crf450r 45kw race bike build

    I ended up with a free 98 honda cr125 frame i've been wanting to convert and found out its so stiff everyone hated them when it was new. Im sure they have come a long way in the last few decades.
  21. DanGT86

    Wireless Crank power meters as torque sensor?

    Thanks. Bummer to see nobody has really completed it yet. I wish I had the time and skill. I really like the idea of a crank spider containing all the torque sensing and wireless guts. That seems like the most universal option. Only major downside is that I hate the idea of having to...
  22. DanGT86

    Observed trials bike designing

    Cant cheat physics for sure. But thats a good thing. Look at existing EV tech. A 1000hp tesla runs the quarter mile at basically the same time you would expect a 1000hp gas motor to do it. Ultimately the wheel shouldn't care where the power is coming from. I see no reason why an electric motor...
  23. DanGT86

    Wireless Crank power meters as torque sensor?

    Been seeing a lot of wireless bluetooth crank spider power meters on the market lately. Has anyone deciphered these major manufacturers' communication such that we could use them as torque sensors for ebikes? They send out torque and cadence info to computers, displays, and I think wearable ride...
  24. DanGT86

    Observed trials bike designing

    The sampling time on the CA3 is adjustable. I don't recall if its the true processor sampling I/O or just the display sampling that it is adjusting. Too fast and its just a blur for the operator to read on the screen. On one of my bikes the controller didn't like the pwm rate of the CA...
  25. DanGT86

    Observed trials bike designing

    I just sent an email to Grin to ask about the sampling rate of the CA3 with regards to the ramping of the current limiter. I was thinking similarly that current limiting packets would need to be updated in discrete time scales that could take effect. Ultimately the CA3 would be obsoleted by an...
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