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  1. hexadrome

    A bike mechanics cost-effective DIY utility build

    I really didn't want to open the motor but a temperature sensor sounds too nice to have. Also it came pre-broken like my smartphone. The metal spring was damaged from what appears to be factory handling. It cut into the motor cable at one point and damaged two sensor leads. So I had to repair it...
  2. hexadrome

    A bike mechanics cost-effective DIY utility build

    It's supposed to, yes. Well, on paper it was a brilliant design. I intend to screw on some fenders so I'd use extra long bolts I thought. Tools and tooling I own only the chinesiest of drill bits. $10 for a set of 150 bits is hard to beat for scrap metal value. They served my needs so well I...
  3. hexadrome

    A bike mechanics cost-effective DIY utility build

    Since ultimately it's my choice and I'm confident the frame won't break under my riding long-term, I'll proceed. The Spank is a streetetz build and it'll stay that way. A rear hub motor isn't right for it. https://www.pinkbike.com/u/bipolarexpress/blog/the-streetetz-era-staring-at-the-sun.html...
  4. hexadrome

    A bike mechanics cost-effective DIY utility build

    In italics, I disagree a bit. Riding down mountains in '99 at 21mph doesn't seem feasible to you? The new riding style will be flat tarmac mostly. A foreseeable difference would be that I'll ride at a higher average speed. It even had Suntour DC90 forks originally, that totally means it's a...
  5. hexadrome

    A bike mechanics cost-effective DIY utility build

    That's really good information to have here. My hard compromise for cost is weight (I've a motor :lol: ) and the 36V battery system. Planned cruising speed is 21mph. I rode the black e-bike without pedals long enough to learn motor limitations. Let me rephrase a bit for clarity: I plan on...
  6. hexadrome

    A bike mechanics cost-effective DIY utility build

    I can gauge the scale of this build a bit better now. I'm no photographer and my smartphone camera is not the best. Taking decent enough pictures takes a long time. Plus I need to scale them better, 3MB/image is too much. I'll upload the image data to my own server, as well as organize and...
  7. hexadrome

    (Solved) Need help identifying motor power by visual comparison

    That was the most probable cause. The controller is installed in the frame bag so there's no air circulation. I will mount components needing cooling openly instead to be sure. Thanks for the advice! Yeah, I wasn't sure about that either.
  8. hexadrome

    A bike mechanics cost-effective DIY utility build

    I prefer to set up suspension on my bikes through trial and error. I run the shock at 110 psi and it feels perfect. I finally found the right year manual. The maximum pressure is 175 psi and it recommends sag settings for downhill use. The shock does hold air since the last time I set it up was...
  9. hexadrome

    (Solved) Need help identifying motor power by visual comparison

    I take that to mean that there is no direct correlation between physical motor size and power. The stator width dictates the maximum amount of power I can dump into it without it overheating. How fast it'll run at that V&A level depends on the windings, so the only way to know for sure is...
  10. hexadrome

    (Solved) Need help identifying motor power by visual comparison

    I'll try to be more precise with my wording: I want to approximate the expectations I should have towards the power range of the DD motor based on the rough dimensions of its hub shell and I have a geared motor with known specs for a visual comparison. The DD shell is about 67mm/2.6" wide and...
  11. hexadrome

    (Solved) Need help identifying motor power by visual comparison

    Hey guys, I got these motors: The left one is 48V 500W geared, the right one is an unlabelled direct drive I've got no specs on. I ran it at 36V in a 26" wheel for a top speed of 34km/h (21mph) so it ran at 273rpm. I'm unsure if there is any correlation between rpm and wattage. Also the stator...
  12. hexadrome

    A bike mechanics cost-effective DIY utility build

    How to install a headset with a brick I'll show fitting a threadless headset, adapt for threaded as is needed. The old headset would be fine and plenty strong. I like to overbuild. I got a cup each of two oldschool downhill headsets so that's what I'll be installing. For shits and giggles I'll...
  13. hexadrome

    A bike mechanics cost-effective DIY utility build

    Hello folks, I'll document my build here. I'll also show possible ways to hack together a working bicycle. What I don't want is a bike mechanic pissing contest on proper or improper ways of building a bike, I'll just show what has worked for me in the past or what I witnessed myself as an...
  14. hexadrome

    Old freeride frame suitable for 1kw?

    I forgot rhetorical questions don't work well on the internet. I think a future Bafang BB build for the Spank is most suited to solve that wheelie problem without needing calculations beforehand. I was under the impression that the Bafang BBSHD is a 48V only system. And since I already got the...
  15. hexadrome

    Old freeride frame suitable for 1kw?

    Your wheelbase is much longer than mine. And it's still prone to wheelies. I see. It will help, but by how much? No, this is not the right frame, I'll be using the Box One still. But have a look at that bottom bracket height guys... This is the perfect starting point for a BB motor conversion :D
  16. hexadrome

    Is it possible to downgrade a controller voltage-wise?

    That's what I was thinking. Somehow, the controller knows the nominal system voltage and shuts off at the low voltage cutoff point for that system voltage. Now my question is, which controller module is responsible for that? I can solder fine, I'd just need to know where to look/what to swap. If...
  17. hexadrome

    Old freeride frame suitable for 1kw?

    Oh no. Oh no no no. Just as I was so sure on the Box One because of the suspension. But guess who also got an old school hard tail downhill frame! Mine has combined DJ/DH geometry and as you can see, it is currently built as a hybrid. I have considered using it as a donor. It is stable at the...
  18. hexadrome

    Is it possible to downgrade a controller voltage-wise?

    The controller arrives this friday, judging from the seller's pictures is does not have any label so these two images are the only data I got. I could try hooking it up to a 36V system to see if it will work out-of-the-box, I'd just hate to fry it.
  19. hexadrome

    Old freeride frame suitable for 1kw?

    I agree. I would've gone for an interference fit and tried handfiling for >0.2mm tolerance for the overbuild TAs. 7kW with regen? I'm impressed, I've already decided that regen would stress the frame too much. Now I'll reconsider. Ideally it will be possible to respacer the motor axle so that...
  20. hexadrome

    Is it possible to downgrade a controller voltage-wise?

    I bought a 48-72V 60A 3000W generic chinese controller second-hand. Bad buy because I've decided against using dual 36V batteries in series shortly after, but it was very cheap. Now I'm wondering if I can adapt it for a future project since I've another 36V battery left over. Does anyone know...
  21. hexadrome

    Old freeride frame suitable for 1kw?

    It's pretty much impossible to find that information. Even so, it looks like I worried too much. This is how I understood the explanation as well. If I were to fabricate such a TA, I'd overbuild it. It'd lie flat upon the chainstay, be double hose clamped and at least half the stays length...
  22. hexadrome

    Old freeride frame suitable for 1kw?

    It was my first build. I haven't wrapped my head around the theoretical side of things enough yet, so I found myself unable to use the simulator properly. I also had no baseline. I did get the same numbers but without any clue as to what that would translate to in real life. I know what to...
  23. hexadrome

    Old freeride frame suitable for 1kw?

    Thank you for your input. I know about the characteristics of URT suspension designs but they coincidently suit my riding style well. Getting out of the saddle is for racers and people who can't shift properly :lol: I don't expect the suspension tuning to be a big problem, I can switch to a coil...
  24. hexadrome

    Old freeride frame suitable for 1kw?

    Hey guys, I'd like to hear your experiences regarding frame durability. Currently I have this setup: Noname 7005 alu frame. I use salvaged e-scooter parts, low-cost but ultimately unsuitable for my goals. Complete luck on the great battery-to-frame mounting, it is durable and unobtrusive...
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