Endless Sphere

Sure, but the benefits trade off against additional cost, weight, wear, maintenance, space onboard, noise, filth, pinch hazard, and points of failure when you add an extra reduction stage. Whether it's worth it depends on application. Perhaps now with fat bikes......which have a greater O.L.D. (e.g...

LeftieBiker wrote: ↑

Nov 25 2020 12:45am

Enforce a rule limiting flame wars to certain OT topics. Encourage posters to proofread their work before pressing "submit." Add a dedicated forum (assuming there isn't one) for pre-built bikes like mine.

I agree.

This forum definitely needs a dedicated forum for pre-built bikes.

H3525 vs. H3548 with 2:1 reduction: https://i.ibb.co/VHfsdJF/Screenshot-27.png MAC 12T vs. MAC 6T with 2:1 reduction: https://i.ibb.co/q1mWr3M/Screenshot-26.png Notice how the very impressive gain in efficiency at the lower and midrange speeds in both the Crystalyte direct drive motor and MAC geared...

What about the gap between the magnets? You could analyze it forever and get a percentage point here or there. The bottom line, it doesnt matter! Just get out there and ride. Stop analyzing and make the purchases now. You may need to lower your expectations. Nothing I see in this thread indicates t...

What about the gap between the magnets? You could analyze it forever and get a percentage point here or there. The bottom line, it doesnt matter! Just get out there and ride. Stop analyzing and make the purchases now. You may need to lower your expectations. Nothing I see in this thread indicates t...

I did plug in some comparisons (using the ebikes.ca simulator) using Grin V1 vs. Grin V2.....both fast and slow winds.....and I also used 26" wheels and 20" wheels. Keeping the wheel size and controller (either Phaserunner or Baserunner) constant the V2 does indeed have a little bit slower...

Some more info on that Grin All axle motor: https://ebikes.ca/product-info/grin-products/all-axle-hub-motor.html n addition to the mechanical changes we also updated from N35 to N40 grade magnets. Stronger magnets allow the motor to produce more torque for hill climbing with less heat loss, but they...

Ok, so according to Leaf: https://www.leafbike.com/u_file/images/19_07_26/125519b508.jpg And eikes.ca spoke calculator: https://ebikes.ca/tools/spoke-calc.html?hub=5300&pair=false&rim=20DM Both the leaf 1500W and Clyte 5305 make a dishless front wheel. Both motors also have the ~same flange ...

Balmorhea, Earlier in the thread you described two wheel and tire combos: https://endless-sphere.com/forums/viewtopic.php?f=3&t=108827&start=25#p1593452 One thing i can't help but wonder about is the spokes and rim on both wheels. Can you tell me what those are? Also direct drive or geared ...

Balmorhea, Earlier in the thread you described two wheel and tire combos: https://endless-sphere.com/forums/viewtopic.php?f=3&t=108827&start=25#p1593452 One thing I can't help but wonder about is the spokes and rim on both wheels. Can you tell me what those are ? Straight gauge or double but...

There are rolling resistance and handling penalties that come with very fat, low pressure tires. A wider tire doesn't have to be higher rolling resistance with poor handling. Hypothetically, you may be right. But in practice, a tire fat and soft enough to offset the ride shortcomings of a small dia...

There are rolling resistance and handling penalties that come with very fat, low pressure tires. A wider tire doesn't have to be higher rolling resistance with poor handling. However, there is such a thing called "Fat bike" where the goal isn't to optimize for handling or rolling resistan...

If you want to get the very best from a hub motor, then use a small wheel Agreed ----> https://endless-sphere.com/forums/viewtopic.php?f=3&t=108781&start=75#p1593391 -- but it will beat you up. If the tire is narrow then yes the pressure will have to be high because the diameter is so small...

It only takes 48V 25A controller in a 26" wheel for <=28mph Yes, 28 mph with a 26" wheel, 48v battery and 25 amp controller is possible with a Clyte H3548: https://ebikes.ca/tools/simulator.html?cont=C25&motor=M3548&mass=170&batt=B4816_GA&hp=0 .....but that same 25 amp con...

It only takes 48V 25A controller in a 26" wheel for <=28mph Yes, 28 mph with a 26" wheel, 48v battery and 25 amp controller is possible with a Clyte H3548: https://ebikes.ca/tools/simulator.html?cont=C25&motor=M3548&mass=170&batt=B4816_GA&hp=0 .....but that same 25 amp con...

A) I would much rather have larger diameter winding wire that is shorter which means less resistance but it can take more power which means low turn count motors (3T, 4T etc) B) then a motor with thinner diameter winding wire that is longer which means more resistance can cant take as much power wh...

All wheel diameter and motor winding combinations I matched up to produce the same top speed on flat ground, That's a sign that the speed is power limited and not motor RPM limited. It's likely that every one of those windings is faster than optimal for the voltage and current you specified. Kv was...

If you want to get the very best from a hub motor, then use a small wheel Agreed ----> https://endless-sphere.com/forums/viewtopic.php?f=3&t=108781&start=75#p1593391 -- but it will beat you up. If the tire is narrow then yes the pressure will have to be high because the diameter is so small...

A) I would much rather have larger diameter winding wire that is shorter which means less resistance but it can take more power which means low turn count motors (3T, 4T etc) B) then a motor with thinner diameter winding wire that is longer which means more resistance can cant take as much power wh...

The difference need to be expressed as a percentage. If a slow winding does 30 mph at 72v it will have the same % speed drop at lvc as a fast winding doing the same top speed at 48v, simply because the fast winding will drop more rpm per volt, proportionally. Learn something everyday never thought ...

The difference need to be expressed as a percentage. If a slow winding does 30 mph at 72v it will have the same % speed drop at lvc as a fast winding doing the same top speed at 48v, simply because the fast winding will drop more rpm per volt, proportionally. Learn something everyday never thought ...

All of the windings climb the same, have the same torque, same efficiency, and can run in the same size wheel. It only takes a different combination of voltage and current for the same power input to get the same torque, speed, and power out at the same efficiency. I can see your point after lookin...

The OP wants 750W and 20mph, but he for some reason wants to use 72V to do that. I think it's a bad idea Don't forget I want climbing as well. Climbing with the least chance of over heating. According to numbers I am getting from the ebikes.ca motor simulator higher voltage and lower amp controller...

dogman dan,

There actually is a 72v 20amp controller?

The reason to do a high wind motor is using less amps and get better torque for fewer amps, fewer amps less heat. Does not mean you can get more torque from motor. Slower wind definitely does produce more torque. For example, compare and contrast Clyte H3525 and Clyte H3540 at 52v: https://ebikes.c...