Endless Sphere

Hard to open... You have to undo all the spokes and pull the two halves apart... Not like regular ones where the sides come off

I lucked into this 1st gen Yuba Mundo frame that became my utility monster as I went further and further down the small diameter wheel rabbit hole... I also have a seat from a big scooter that clamps onto the rack for passengers. My kids were older, so less worry, but really really think about ways ...

You're going to love it either way 👍 Mid cargo with powerful motor is just about the perfect car substitute. From my experience, I would pick direct drive. I really value reliability for this kind of utility bike, so direct drive is nearly indestructible, as long as you don't grind it uphill at low ...

Lots of premade ones out there too, to either buy or copy.

From my 72v paralleling experience, a small mismatch in lengths and uneven wearing never turned out to be issues, esp if not used at crazy amp levels and super deep discharges. One thing to consider if using XT90 type is if you make it to where the system can run with one battery unplugged, the meta...

Ideally you should have a BMS hooked up all the time, that monitors each group during use, to prevent one from sagging too low before the overall battery low voltage cutoff happens, and they usually have amp limits to keep hooking it to a controller that draws too much current from damaging the enti...

Another p.s.... it's not as safe, but you can run the battery without a BMS, and manually check it for balance periodically. The biggest thing is making sure the low voltage cutoff in the controller is high enough to not take the battery voltage too low during running. I get lots of batteries that h...

I've got some leftover BMS boards from Solo wheels that were for split 14s packs. I'll send you one for experimenting if you want.

P.s. none of the stuff for balancing and temp monitoring is in a charger usually.

I've got a giant bin of 36v controllers and throttles from dead bikes... I'll send you one if you pay postage. Feel free to pm me about it

I would go fat tire if you have the chance vs 27.5, but there's been a few fat tire frames I set customers up with where the chainrings got too close to the seat stay, and we had to switch to a different frame. Just an fyi, on one customers aluminum fat bike frame, the pull on the chain from the mot...

Not just basement generic batteries either.. it was like that in some Bosch packs I opened also.

All the ones I've seen have the power and charger wires soldered on, so you're at least looking at doing that, or finding one with short wires already attached, and splice to your existing wires. Making sure the balance wire plug matches is good... It sucks to have to splice all of those too, but th...

You can't with the stock system. Some of the later model ones were 36v, so maybe that is why this one is slower.

Edit- could the other faster one you rode maybe have had aftermarket controller etc under the plastics?

And you prob won't be able to find that exact BMS, they're pretty random. I've opened up outwardly identical packs from the same brand ebike, with totally different BMSs inside

Can you get to the actual positive and negative of the battery, before the BMS? If you have normal voltage there, but none at the BMS, that usually means new BMS, unless you can find a broken wire or something... Usually no fuses between it and the battery, usually fuses are just on the charger inpu...

Do you have a voltmeter?

The tester link didn't show up...

Being extra hard to turn is sometimes a sign of the phase wires being shorted together...

Cogging is what is usually called... Normal backwards spin on a gear motor should be harder than forwards, but like a gentle whirring, not super notchy.

Geared motors are supposed to be hard to turn backwards... That's when you're actually making to motor turn inside the outer shell... When you spin it forward the clutch releases and just the outer shell turns, unlike a direct drive where it feels the same both directions. As to why it's not running...

Re. using thicker balance wires, thin ones are somewhat self fusing, and will melt if shorted...usually anyway. When you go bigger, then you also have to start thinking about individually fusing each one, in case the harness shorts in a crash, for example...

One plus of at least having plugs for the parallel-ing is you can separate the packs, and have two chargers, one per pack, and halve your charge time.... Here's one of my typical heap-o-recycled batteries setups.. 4 recalled Pedego packs, and 2 thrown away $900 Bosch packs that both got a drop of wa...

I don't have much personal experience with it, but have read certain BMSs don't like being in parallel. Assuming that's not a problem, then diode free is better, otherwise the packs won't try to equalize voltage with each other. If they aren't perfectly matched units, one will have slightly less cap...

I just run a backpack battery on my full suspension builds, esp during the early days of a build when you're not even sure if you'll love the ride. It's the hardest part of the setup to get right, and I've had several times I was excited about a particular bike, and all the getting the battery turne...

Re the overheating, the voltage won't make the motor overheat, it's the total power i.e. high amps at that voltage. Have you been changing gears so the motor isn't subtly bogging down on hills and slowly cooking? I ask as it's a powerful motor, and can keep grinding even though it would be happier a...

This is just guessing, don't know that exact motor, but that sure looks like a Hall wires connector, with the white wire probably being speed signal. I'm not sure the motor would even run without Halls working, does it fit any plugs on the controller, even though the board side might be white, and m...