Recent content by frk1206

@999zip999 just one controlling both - the front engages a little later than the rear to prevent spin out.

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...

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...

Yup thanks that was a dumb idea. I was trying to make it look pretty 🤣

Oh no you think it’s that bad? I thought some quick soldering not directly on the top of the battery was okay. I can take these cells out and replace with new ones so all is not lost.

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...

Though that’ll be awesome I just realized that something that just tells you to “inflate rear shock to 275psi and front to 200” is equally useful and possibly a good v1! Now if I can find a air shock that’ll take that much weight!

So now you see where im going with this :) I'm a big suspension nerd and feel that if the suspension can be dialed in correctly in some smart way then it would be amazing thing to have on a cargo bike (safety and comfort wise). A cargo bike that you take alone as well because its so much fun to...

ah interesting will that give you the force acting on the piston somehow? I didn't know that. do you know of a shock that'll take 400lbs? Mostly they seem designed for a 200lb rider + bike so around 250lbs or so. This number isn't published so hard to nail it down.

Interesting - I'm not a mechanical guy so can't speak for much about the design. Will ask the folks who are! Thanks for your input! Do you think the original design isn't going to be sturdy enough? Complex swing arm was a design choice - wanted to package the shock nicely inside the frame so...

Our thinking was that with a single big spring shock - we would have a lot more flexibility in choosing the right spring after the fact. You think an air shock would actually be better if we can get the load range right? I was under the impression that spring (downhill) shocks would be best to...

It’s a work in progress didn’t mean it as a smart ass comment just that if you have access to resources why not do the hard work. How would you design the rear?

This is what I’ve had for a long time and it’s not enough for me. If lightweight dirt bikes can do I don’t understand why cargo bikes cannot. The weight isn’t that variable since unless you are actually hauling very heavy cargo the target weight is mostly known (you and maybe a small child or...

Because I was able work with some experienced mechanical engineers :) A link type suspension will almost always be superior (even though require more work). Also it allows much neater inline packaging of the shock so can kids can sit peacefully and full side bags can be mounted.

What do you ride and how did you build it l? Looking for tips on the rear suspension since it seems to be voodoo more than science. I’m with you on the 20mph - This bike isn’t designed to go much more than that but I definitely want a lot of torque to get to 20 quickly :)