Endless Sphere

An update for those wondering why one the bigger builders on this forum is not a builder anymore.. My $250/month small dark dusty warehouse corner with no air conditioning or protection from pollution's effects on me turned out to be the deal of a lifetime compared to what's out there now, which i ...

"The best kind of fast bike is one that doesn't look like one"...very true :wink: . You want to fly under the radar and not get stopped like I did. APL...last time I checked, HPC would not sell just the frame and I have not found another one like the one you have pictured. If there is anot...

Nep...do you want a rear suspension? Nothing you don't know...but a rear suspension is nice from the comfortable ride perspective but it can complicate things a little bit with more movement for the wiring going to the motor and the weight of the motor being "unsprung"...the Shengyi would ...

Neppie...I recently bought a Schwinn Axum from Walmart. Aluminum frame and 29" wheels. I got the "Large" frame for two reasons...enough leg room and enough room in the forward triangle for a decent sized battery. And yes it does come in different size frames from Walmart :thumb: . I i...

That's a top shelf rim, appropriate gauge spokes, good choice of hub motor... all the right ingredients, I think. As long as it's good and tight, it should give you reliable service. Well done. How much power do you intend to stuff into it? And how did you put in the Statorade? Thanks :) yes.. spok...

https://i.imgur.com/U6CaMcY.jpg Got my wheel finished That's a top shelf rim, appropriate gauge spokes, good choice of hub motor... all the right ingredients, I think. As long as it's good and tight, it should give you reliable service. Well done. How much power do you intend to stuff into it? And ...

do as you wish, but...there are 3-speed throttle switches. They are simply resistors of different values to alter the 5V throttle signal to the controller. Thanks spinningmagnets...that is a good tip for anyone :thumb: . I have one on my bike with a 10T MAC and I really do use it and it is usually ...

I suppose different riders have different user-profiles. I only use high amps for a short acceleration phase, and then I cruise at a lower speed than my max possible. While I'm cruising along, I use fairly low amps. My problem is my right wrist MUST turn the throttle as far as possible as often as ...

What frame is this motor on? Did you pre-service aka grease the bearing? No. It is a ester base low temperature / wide temperature grease, in the bearing I paid for. This means it works form 0*C to 100*C. You can get the bearings pre packed with about five different lubricants. Here is my build thr...

Thats a very good way of wording the super myth on hub motors. I have only seen 40a and 50a maximum current bms' from the usual reliable builders, 60a would be nice ;) One thing I would like to clear up for myself after reading the articles link was a hint that its just amps is it the current (a) o...

Thanks to everyone here for sharing the pics and data. https://www.electricbike.com/leafbike-1500w-hubmotor-the-mid-sized-hot-rod/ Spinningmagnets has a very good and informative article on the Leaf Motor and he included a lot of stuff that is applicable to not only the Leaf motor but any electric ...

Bullfrog, we're primarily looking to sell these motors on our own bikes, many of which are built on compatible frames. Selling motors for DIY is a bonus opportunity for adoption, which I'm expecting will lead to even more variety in applications :D I did not mean to come across as negative in any w...

Just a suggestion, design and offer a separate motor that will mount similarly to the BBSHD as well as the one you have...that will should cover just about every bike frame made today. Unfortunately, not every bike frame will ever be compatible with this type of drive system. 157mm is the narrowest...

Bullfrog, The ESC (motor controller) will actually take 72V Nominal (~90VDC) and up to 90A, but we have never tested the system that high due to our preference for commercially-available battery packs. Most likely the motor will burn out at those power levels anyway :) 50A is about what our pack BM...

Mid drive, up to 60V, 50A, over 300 Nm torque at the rear wheel, tougher than anything I've ever ridden. We have tried to destroy these bikes and nothing will break (besides some early electronics iterations, usually from R&D guys wiring things up weird, the engineers did nothing wrong!) Thanks...

Deafcat wrote: ↑

Feb 18 2022 10:50pm

last one was kinda shit, here... Four Days now, really:

Happy weekend! Cheers,

So Tuesday the 22nd of Feb is the big reveal day .

Can you tell us anything at this point...i.e. mid drive, hub, geared hub? Allowable battery voltage? etc.?

Hard to say exactly what caused the RH212 to fail like that, but yeah it's pretty bizarre and not something I've ever encountered before either. There were not any obvious external factors and the point it failed wasn't a particularly hard bump, having hit far larger one's prior without issue. I wa...

Justin at Grin Tech was the one that told me about running a MAC at 150C without any degradation on his dyno. I later checked and although I can't remember what magnets the MAC uses, 150C was not supposed to degrade them any. I don't roll the power back at 150C, I actually kill the power completely ...

One could argue your not a true hobbyist until you have 2 digital multimeters and cooked 1 motor. I have one multimeter and have cooked about 6 motors so what does that make me :P My latest was a RH212...shoulda bought a Leaf motor! https://endless-sphere.com/forums/download/file.php?id=310260 http...

Possibly going back to the saturation discussion; I noticed that the more current is available to the motor, the "knee", for lack of the correct term, in the torque curve moves up and toward lower speeds/rpms; and at some point the torque curve become completely smooth; at 325 battery amp...

Below is an explanation of Magnetic Saturation and its effects from one of the guys on the Endless Sphere forum that I respect a lot: " The saturation point only depends on the iron properties and the amp-turns of copper. Making the laminations thinner won't change the saturation point but wil...

Yes I know this is an old thread but I need a little help. Trying to determine the relative backlash in a Sturmey Archer CS-RK3 hub...can someone roll their bike forwards while holding the chain, if it moves, and tell me the number of clicks in one revolution of the rear wheel? I believe it is aroun...

Below is an explanation of Magnetic Saturation and its effects from one of the guys on the Endless Sphere forum that I respect a lot: "The saturation point only depends on the iron properties and the amp-turns of copper. Making the laminations thinner won't change the saturation point but will ...

Regarding magnetic saturation.... My limited understanding is that....When Magnetic Saturation occurs, it is a function of the material used for the poles i.e. the piece that the stator coils wrap around. And it is nothing more than the magnetic strength of the poles is no longer linear with regard ...

Here is what I get with Leaf bike 1500 Kv set at 9.6: https://ebikes.ca/tools/simulator.html?bopen=true&motor=9C212_6T&batt=cust_72_0.00001_40&cont=cust_80_250_0.00001_V&hp=0&cont_b=cust_80_250_0.00001_V&motor_b=Leaf%205T&batt_b=cust_72_0.00001_40&hp_b=0&kv_b=9.6...