Search found 79 matches

by mbgjt1
Nov 14 2020 7:55pm
Forum: EBike General Discussion
Topic: What is the point of a 3T, 4T, 5T winding if torque per amp is the same?
Replies: 31
Views: 1692

Re: What is the point of a 3T, 4T, 5T winding if torque per amp is the same?

The real reason to pick a slower wind motor, is not efficiency per se. Its to go slow. Two examples, Delta trikes (adult trikes) need to stay below 15 mph in general, because steering them gets tricky when ridden faster, and the rider may be 80. Pick a slow motor, so that at 36v the trike is truly ...
by mbgjt1
Nov 14 2020 7:53pm
Forum: EBike General Discussion
Topic: What is the point of a 3T, 4T, 5T winding if torque per amp is the same?
Replies: 31
Views: 1692

Re: What is the point of a 3T, 4T, 5T winding if torque per amp is the same?

Hub motor Kv is meant to match wheel size. There are no other reasons, but it does seem hard to understand for many. Wheel size does command a hub motor Kv that will let you build a system that is powered with reasonable voltage for the speed that you plan to achieve. If your choice of Kv is too fa...
by mbgjt1
Nov 14 2020 7:51pm
Forum: EBike General Discussion
Topic: What is the point of a 3T, 4T, 5T winding if torque per amp is the same?
Replies: 31
Views: 1692

Re: What is the point of a 3T, 4T, 5T winding if torque per amp is the same?

Justin from Grin Tech explains that the torque for different kv motors will be the same, and efficiency is also the same, Torque per amp is not at all the same from different motor windings. It's only the maximum possible torque that's the same, and that implies very different controllers and batte...
by mbgjt1
Nov 14 2020 7:49pm
Forum: EBike General Discussion
Topic: What is the point of a 3T, 4T, 5T winding if torque per amp is the same?
Replies: 31
Views: 1692

Re: What is the point of a 3T, 4T, 5T winding if torque per amp is the same?

Yes, if you know you want high voltage for top speed anyway apparently it doesn't matter. But if your existing gear or poverty/frugality dictates a low pack voltage, then you need to pick the winding that will get you to the top speed you need at that voltage. A couple of **very** strongly opiniona...
by mbgjt1
Nov 12 2020 2:55pm
Forum: Bike Mechanical & Structural
Topic: DNM USD 8 vs USD 8s for QULBIX 140r Moto frame?
Replies: 12
Views: 712

Re: DNM USD 8 vs USD 8s for QULBIX 140r Moto frame?

Personally I don’t like DNM suspension components. They can do the job on the street, but I find them very poor performance in mountain trails. If you don’t have the budget for a good fork, check the adds on pinkbike for a used DH fork, even the older ones. Find a top of the line Marzocchi, Rocksho...
by mbgjt1
Nov 12 2020 2:53pm
Forum: EBike General Discussion
Topic: What is the point of a 3T, 4T, 5T winding if torque per amp is the same?
Replies: 31
Views: 1692

What is the point of a 3T, 4T, 5T winding if torque per amp is the same?

QS 205 motor V3... I've just watched this presentation by Grin Tech, at 2:16:00, Justin from Grin Tech explains that the torque for different kv motors will be the same, and efficiency is also the same, but a higher kv motor will allow for higher speeds when climbing the same hill (provided we input...
by mbgjt1
Nov 09 2020 2:04am
Forum: Bike Mechanical & Structural
Topic: Qulbix 140r Frame Review, has anyone purchased this frame?
Replies: 0
Views: 296

Qulbix 140r Frame Review, has anyone purchased this frame?

Hi all, I would like to take advantage of the 50% sale by Qulbix and buy they 140r frame, mounting a QS205 as a rear hub motor. Does anyone have experience with this type of frame? Is it strong enough to handle 21kW peak power from the motor? My weight will be around 70 kg but it would be good to ha...
by mbgjt1
Nov 09 2020 1:59am
Forum: Bike Mechanical & Structural
Topic: DNM USD 8 vs USD 8s for QULBIX 140r Moto frame?
Replies: 12
Views: 712

DNM USD 8 vs USD 8s for QULBIX 140r Moto frame?

I am looking at getting the 140r moto frame and pairing it with some suspension Rider weight would be 125 kg, mostly street riding and some fire trails. What options would you all recommend? It seems the USD -8 is a very popular option. What is the difference between this and the USD-8s? It looks li...
by mbgjt1
Oct 29 2020 2:55am
Forum: EBike General Discussion
Topic: QS205, mounted as a hub motor on the rear, or as a mid drive?
Replies: 2
Views: 379

Re: QS205, mounted as a hub motor on the rear, or as a mid drive?

There is an important advantage mounting a hub motor as a mid drive. Not only it does let you gear it down, but also improves handling by setting the weight to the middle of the bike, and optimizing the suspension by taking off a substantial amount of unsprung weight. The only downsides are extra w...
by mbgjt1
Oct 21 2020 10:56pm
Forum: EBike General Discussion
Topic: QS205, mounted as a hub motor on the rear, or as a mid drive?
Replies: 2
Views: 379

QS205, mounted as a hub motor on the rear, or as a mid drive?

I'm not sure if some of you have been following Ladi's Cyberbike build, but I believe he uses a QS205 mounted on a Vector Vortex frame which is suitable for a QS205 hub motor to be mounted in a mid drive configuration. Apart from a mid-drive motor having better weight distribution, are there any oth...
by mbgjt1
Oct 21 2020 10:49pm
Forum: EBike General Discussion
Topic: Impure copper wiring in stock QS205?
Replies: 3
Views: 218

Impure copper wiring in stock QS205?

I have been watching a video by Cykonebike explaining how they change out the copper wiring inside the QS205 stock hub motor and replace it with higher quality copper with a higher purity. This will allow the motor to accept much higher amps from the battery and controller without damaging the inter...
by mbgjt1
Oct 21 2020 10:42pm
Forum: EBike General Discussion
Topic: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?
Replies: 34
Views: 941

Re: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?

I have one 30X4t in a 24’’ bicycle wheel. I feed 24s and it does 75 kmh climbing 10% without any risk of overheating. Total riding weight 254 lbs. Many factors are responsible for the efficiency, acceleration and top speed of a bike. Aero drag, wheel size and riding weight are making a huge differe...
by mbgjt1
Oct 21 2020 10:42pm
Forum: EBike General Discussion
Topic: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?
Replies: 34
Views: 941

Re: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?

I have the 3.5t in a 17” wheel, with field weakening I get up to about 85mph. We have hills here too. As long as you keep the speed to a minimum of 25-30mph going uphill you can mostly avoid overheating. Depends how long your hill is. The one next to my house climbs 2000ft in under 8 miles. I have ...
by mbgjt1
Oct 21 2020 10:39pm
Forum: EBike General Discussion
Topic: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?
Replies: 34
Views: 941

Re: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?

Get a 3t in a 13" scooter rim, which works out to a 19.25-20" OD wheel depending upon the tire you buy. That or a fast wind 273 if you want to go spokes and a bit larger wheel like a 17". If all your riding is on roads that are in good condition, then the size of the wheel and weight...
by mbgjt1
Oct 21 2020 10:34pm
Forum: EBike General Discussion
Topic: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?
Replies: 34
Views: 941

Re: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?

I am not that convinced about 4t and good acceleration to 90km/h. But it depends on what voltage you use of course. I have a QS 205 50h 4t in a 16" wheel, and if I remember correctly it goes about 80km/h without field weakening. That should be at about 80v I think. I have had 17" wheel to...
by mbgjt1
Oct 20 2020 10:50pm
Forum: EBike General Discussion
Topic: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?
Replies: 34
Views: 941

Re: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?

These guys judging you for road grade numbers just like to get into arguments. But they don’t know squat. I believe it's fact finding. The original 100% grade was ridiculous, and when challenged by Balmorhea , immediately dropped 36%, and while was less ridiculous, it's still not factual. It's prob...
by mbgjt1
Oct 20 2020 10:44pm
Forum: EBike General Discussion
Topic: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?
Replies: 34
Views: 941

Re: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?

A QS205h50 can climb any hill road. And yes, it will be happier in a smaller wheel, although some very slow windings are available when you have good reasons to prefer large wheels. On the road normally, large wheels are not a must. 4T QS205 motor paired to a 17" wheel, would that be the best ...
by mbgjt1
Oct 20 2020 10:42pm
Forum: EBike General Discussion
Topic: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?
Replies: 34
Views: 941

Re: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?

These guys judging you for road grade numbers just like to get into arguments. But they don’t know squat. 19” wheels are a bad idea for hills as they result in a too-tall gear ratio for a hub motor. Go qs205 in a 16 or 17”. You’ll be fine. Thanks mate, 17" looks like a very promising size and ...
by mbgjt1
Oct 20 2020 10:41pm
Forum: EBike General Discussion
Topic: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?
Replies: 34
Views: 941

Re: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?

999zip999 wrote:
Oct 20 2020 12:50pm
Do some research on your wheel size which is very important for hills. Smaller more torque.
Any sources you can point me towards?

I want a wheel size that offers the best balance of high torque and gives the ability to reach speeds of 90kmph. Would 17" be suitable for this?
by mbgjt1
Oct 20 2020 10:39pm
Forum: EBike General Discussion
Topic: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?
Replies: 34
Views: 941

Re: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?

correction , probably more around 10 to 20 degree gradients.. Gets very steep! Can you provide a location on Google maps of some of these roads? The steepest street in the world is a 35% grade, or 19 degrees , and there are several online tools that can measure the actual grade. 10 degrees is a 17....
by mbgjt1
Oct 20 2020 2:30am
Forum: EBike General Discussion
Topic: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?
Replies: 34
Views: 941

Re: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?

correction , probably more around 10 to 20 degree gradients..

Gets very steep!
by mbgjt1
Oct 20 2020 1:23am
Forum: EBike General Discussion
Topic: Peeps, I need help with finalizing a choice for a motor, QS205, anything better?
Replies: 34
Views: 941

Peeps, I need help with finalizing a choice for a motor, QS205, anything better?

Need some advice, I'm building an e-bike with a rear hub motor for a 150 mm frame drop out. Initially I planned on building with a QS273 motor, but many have advised that this would be too heavy, and would require an upgrade of all other components (frame, brakes, suspension, etc.). I've been advise...
by mbgjt1
Oct 11 2020 12:22am
Forum: EBike Build Threads
Topic: Vector bike and frame owners.
Replies: 1087
Views: 175882

Re: Vector bike and frame owners.

Hi Artur, I am looking at purchasing an e-bike frame from your website, looking at the Vector Typhoon and the Vortex. Could you please tell me what the difference between these are? From what I can see, the Vortex is 2 kg heavier, and is made for a mid-drive motor. My DIY bike build will have a rear...
by mbgjt1
Oct 11 2020 12:08am
Forum: EBike General Discussion
Topic: Anyone used the EIG c02 batteries?
Replies: 1
Views: 123

Anyone used the EIG c02 batteries?

Please refer to the following link: https://youtu.be/z86Mt6t6Cn8 Has anyone used these in a build ? I would like to use then in my current build for a 72V 50ah battery. Qs205 motor Thoughts ? Datasheet: https://www.google.com/url?sa=t&source=web&rct=j&url=http://www.ebaracus.com/sites/de...
by mbgjt1
Sep 28 2020 2:40am
Forum: EBike General Discussion
Topic: Enduro E-Bike Build, Totally Lost, Help and Advice Needed Please..
Replies: 1
Views: 210

Enduro E-Bike Build, Totally Lost, Help and Advice Needed Please..

Hello all. I currently live in New Zealand, and am looking at building an e-bike mostly for on-road, but some off road light forest / park trails. I would like to achieve speeds of 80 - 90 km /h (50 - 56 mph), with a focus on great acceleration. Hoping to accelerate from 0 to this speed in under 8 s...