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  1. frk1206

    Need ideas and framebuilders for v2 of my FS electric cargo scooter

    Hey everyone this is something i've been working on a while now and its finally here and ready. This is a v1 or prototype of my urban electric cargo scooter designed to carry 2 kids and groceries up any hill. Its got dual grin all axle motors and a 1.8kwh custom battery pack by me. Currently...
  2. frk1206

    Which hydraulic brakes (w/switch) to fit my Grin all axle?

    I'm looking for a front hydraulic brake (with a switch) to fit my Grin all axle. The available clearance is only 18mm and since I'm unable to find dimensions online I'm wondering what other people have been using. I'm currently using a Sram Guide caliper that BARELY clears the hub but doesn't...
  3. frk1206

    Which end terminal battery solder is better?

    I’m building my battery using the copper / nickel sandwich method. I did the negative side wire solder like this which is kinda yucky: Then I had a idea and did the positive side directly on copper. Way neater since I was able to do the solder prior to welding: should I redo the negative...
  4. frk1206

    My custom frame full suspension long tail dual hub cargo bike

    I couldn't find anything on the market that didn't suck so like a true engineer I decided to build my own. This is my long tail full suspension cargo bike cad model for a custom frame. This is going to be a 20" GMAC rear hub, 26" grin all axle front, 72V 2kwh custom battery. Why? because...
  5. frk1206

    Welding my cells - does this copper+nickel weld look good to you?

    How do you guys test the strength of your welds and know if one is better than the other? Trying the sandwich method at 60J with kweld and they “look” good. Don’t come off by pulling either. So should I declare them good and move on?
  6. frk1206

    Increasing planetary gear reduction on my GMAC10T

    Is this possible to do? I have a cargo bike and am used to the torque of a BBSHD in very high gears. The GMAC is pretty anemic in comparison with its 5:1 gearing torque-wise. Is it possible to open up the gmac and increasing gearing to say 10:1 or something like that? I understand that'll...
  7. frk1206

    Looking for a better hill climbing setup with my gmac / baserunner

    Hi folks! I recently took the plunge and upgraded? from a BBSHD to a GMAC + Baserunner on my Cargo bike. The first thing I notice is while I have significantly more top speed my hill starts are painful specially when loaded with my kid + cargo (roughly 350lbs with bike). Anything over 5% becomes...
  8. frk1206

    Looking for custom framebuilders who design full suspension bikes/mopeds

    Hello all, I'm looking to build a full suspension longtail cargo e-bike and need help putting the frame together. I'm a software/hardware/cad guy but actually welding pipe frames and the design/physics of suspensions is beyond me. I'm in Oakland, California and willing to pay well for the right...
  9. frk1206

    Cargo bike motor recommendation

    Hello everyone! After testing existing $10k cargo bikes at the local bike store (Tern, Reise Muller, Radwagon) I've realized they are all underpowered and decided to build my own. I''ve built many bafang BBS02 and BBSHD mid drive bikes with custom battery packs so I know the drill. I'm...
  10. frk1206

    68Kw/140Nm DCFC capable street motorcycle prototype

    Hi All! Wanted to share with you folks a crazy ambitious (to me) build to create a super fast comfortable street bike that could do 40-50 miles on a charge and be able to utilize the growing number of L3 CCS/Chademo stations to get 20-30 miles of range in about 15 minutes. Yet weighing under...
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