Search found 257 matches

by Drum
Jan 06 2018 11:47pm
Forum: Items for Sale - New
Topic: FREY eMTB with Bafang m600 is developing with your ideas!
Replies: 441
Views: 47210

Re: FREY eMTB with Bafang m600 is developing with your ideas!

Hi Frey Bikes and other members of the ES forum. I am excited to see a manufacturer who has the resources to design and manufacture a bike tapping into the wealth of knowledge and experience of the members of this forum. I think it is a good pathway to achieving a great result. A few months ago I wa...
by Drum
Jan 03 2018 7:21pm
Forum: EBike Non-hub Motor Drives
Topic: Sur-ron Adaptto
Replies: 32
Views: 8365

Re: Sur-ron Adaptto

There would be a couple of disadvantages with fitting a freewheel: -You would lose regen "braking". Depending on the type of riding you do, this may or may not be a big issue, but if you are riding up & down big hills, or accelerating / braking a lot, you would end up converting all yo...
by Drum
Jan 03 2018 7:04pm
Forum: EBike Non-hub Motor Drives
Topic: 02 Jamis Dakar Comp mid drive choice
Replies: 16
Views: 3008

Re: 02 Jamis Dakar Comp mid drive choice

Hi Mike, I see what you are trying to achieve, but my choice would be to keep the progression from one sprocket to the next "standard".. biggest sprocket nearest the wheel, then next smaller etc.. and set the middle one of the three you expect to use for the "perfect" chain line....
by Drum
Dec 08 2017 4:13am
Forum: EBike Non-hub Motor Drives
Topic: My Bafang Ultra Mountain Bike! Frey AM1000
Replies: 2372
Views: 322171

Re: My Bafang Ultra Mountain Bike! Frey AM1000

For figuring out how to "tune" the parameters to alter response, it would be helpful to have the manual as well as the screenshots of the parameters. My guess is the "Delta Voltage" is a correction to get the individual torque sensor output voltage the same as it is supposed to b...
by Drum
Dec 07 2017 11:24pm
Forum: EBike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 5397
Views: 605487

Re: Sur-Ron - New Mid drive Bike from China

Oil filling a low rpm direct drive hub motor has worked well for conducting heat from the windings to the casing. At the low speeds involved, the viscous drag is apparently not too much of an issue. However this motor is spinning MUCH faster, and oil or other fluid inside the motor would probably ca...
by Drum
Dec 07 2017 5:54pm
Forum: EBike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 5397
Views: 605487

Re: Sur-Ron - New Mid drive Bike from China

Re: Motor cooling. I remember a Russian guy saying that fitting forced air cooling to a Cyclone motor made a huge difference to how hard / long he could ride before temperature rise became a problem. From your photo it looks as though there is a bit of room for air to circulate around the windings, ...
by Drum
Dec 04 2017 2:51pm
Forum: EBike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 5397
Views: 605487

Re: Sur-Ron - New Mid drive Bike from China

That's quite impressive performance on a motocross track, considering it isn't really being marketed as a motocross bike. Obviously the suspension is doing its job ok, and there is quite a bit of power. I'm keen to see how it will go on singletrack and semi-trials riding.. hope you get a chance to r...
by Drum
Nov 03 2017 3:58pm
Forum: EBike Non-hub Motor Drives
Topic: Revolt 120 pro eTrial overheating problem
Replies: 97
Views: 15491

Re: Revolt 120 pro eTrial overheating problem

It's great to see that you have got the bike going well. It is a shame that it took so much work, but you got there in the end. The gearbox adds weight, complication and losses, but allows the motor to work in the high rev / low current regime most of the time. Good work, hope you get a lot of enjoy...
by Drum
Oct 29 2017 7:15pm
Forum: EBike Non-hub Motor Drives
Topic: Trial riders need their clutch?
Replies: 81
Views: 9861

Re: Trial riders need their clutch?

For trials riding, it is important to have the ability to "launch" hard from a complete stop, to get the front wheel up and get as much speed into the bike as possible in half a bike length. What a clutch allows with an IC engine is to rev the engine with the clutch disengaged, store energ...
by Drum
Oct 11 2017 3:28pm
Forum: EBike Non-hub Motor Drives
Topic: high RPM rc motor
Replies: 10
Views: 1710

Re: high RPM rc motor

I would agree with Scooterman.. the motor you have posted a link to is quite high kV (rpm per Volt) so would require two stage reduction to the back wheel. Each reduction stage costs money, adds weight, produces noise, uses up some of the power and adds to the build time and future maintenance. If y...
by Drum
Oct 01 2017 7:21pm
Forum: EBike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 8315
Views: 907903

Re: New "TSDZ2 Torque Sensor Central Motor"

Hi RTIII, I think that Speady was not saying the one-way bearing was supporting the rider's weight, he was using the rider's weight multiplied by the length of the crank arm to calculate the torque that would be applied to the one-way bearing. If he is correct that the pedalling torque goes through ...
by Drum
Sep 19 2017 2:39pm
Forum: EBike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 3797

Re: Freewheeling Design for the Shimano Hollowtec II Cranks

I agree that it would be a very useful "bolt on" adaption if possible. The Hollowtech (and similar cranksets from other manufacturers e.g.Raceface) are so much stronger than the ISIS / Octalink that they are the only real choice for heavy offroad use. Will do some thinking.. and some resea...
by Drum
Sep 15 2017 3:48am
Forum: EBike Non-hub Motor Drives
Topic: Merida eOne sixty
Replies: 3
Views: 1070

Re: Merida eOne sixty

Yes, the write-ups I am seeing put the Merida e one sixty at the top of the list of current e-bike offerings from the major MTB manufacturers. I haven't been lucky enough to ride one, but I just had a Specialized Turbo Levo FSR "Fattie" for 2 hours in the forest near Rotorua (New Zealand)....
by Drum
Sep 15 2017 3:14am
Forum: EBike Non-hub Motor Drives
Topic: 4KW Bikee Bike Mid Drive System Made in Italy
Replies: 4
Views: 2058

Re: 4KW Bikee Bike Mid Drive System Made in Italy

Hi, Is this a standard 1500W Bikee system that you have "hotrodded" with a gruntier controller, or is this setup being sold by Bikee officially? If it can reliably handle that power, it has advantages of simplicity and ease of mounting. I am guessing it is quite quiet, especially with the ...
by Drum
Aug 26 2017 12:33am
Forum: EBike Non-hub Motor Drives
Topic: Recommended trigger shifters
Replies: 5
Views: 749

Re: Recommended trigger shifters

I use Mountainbike components: Shimano Deore is the minimum "good" level, SLX is better, XT expensive but better again. Similarly SRAM X5; X7 etc Of course you get what you pay for: the higher end components definitely give you a better riding experience, but Deore / X5 should be good enou...
by Drum
May 12 2017 2:27pm
Forum: EBike Non-hub Motor Drives
Topic: Direct Drive Genesis
Replies: 361
Views: 65103

Re: LR Direct Drive Genesis

It would be a good idea to put a multimeter across the output of the throttle to see what voltage it is putting out at various positions. You would be able to see how much of that behaviour is caused by the properties of the throttle which cannot be altered, and how much could be tuned out with the ...
by Drum
May 08 2017 2:30pm
Forum: EBike Non-hub Motor Drives
Topic: Direct Drive Genesis
Replies: 361
Views: 65103

Re: LR Direct Drive Genesis

Kelly Rgen: Your controller is covered by this user manual: http://kellycontroller.com/mot/downloads/KellyKBS-XUserManual.pdf All the info you need is there, but a bit cryptic if you haven't played with them before. From my reading of the manual and the screen shots you have posted, my suggestion wo...
by Drum
May 07 2017 2:18am
Forum: EBike Non-hub Motor Drives
Topic: Direct Drive Genesis
Replies: 361
Views: 65103

Re: LR Direct Drive Genesis

Hi Skeetab, I think Dan is correct. If you swap to "Speed" mode, when you apply say 30% throttle the controller will apply full torque in an effort to get you to 30% of max RPM as quickly as possible.. not desirable with the power you have. My Kelly has a hybrid mode, part speed / part tor...
by Drum
Apr 09 2017 3:11am
Forum: EBike Non-hub Motor Drives
Topic: Any interest in disc brake mounted sprockets?
Replies: 37
Views: 7853

Re: Any interest in disc brake mounted sprockets?

Here's an adapter I made a few years ago to mount a Go-kart sprocket on a disc brake mount. I made two, and the second ended up travelling from New Zealand to Sweden to help Fastcrille with his build. I got the rear sprocket adapter back from waterjet cutting today. (Anyone in NZ who wants waterjet ...
by Drum
Mar 17 2017 2:36pm
Forum: EBike Non-hub Motor Drives
Topic: drone pancake motor low reduction mid drive with regen
Replies: 16
Views: 4582

Re: drone pancake motor low reduction mid drive with regen

Each type of motor has its advantages and disadvantages. For different uses, the same person might select different motors of the same power. For example if I was building a mid-drive cargo bike for use on smooth sealed roads I might choose a hub motor, or a lower kV motor like the BHT or similar. B...
by Drum
Mar 16 2017 11:30pm
Forum: EBike Non-hub Motor Drives
Topic: drone pancake motor low reduction mid drive with regen
Replies: 16
Views: 4582

Re: drone pancake motor low reduction mid drive with regen

Hi Mechhead, Thanks for bringing these new motors to our attention. While I agree that Matt / Recumpence makes excellent drives using Astro motors, that is no reason to ignore a new class of motor that could be worth attention. I have looked up the T-motor website and researched the U13 particularly...
by Drum
Sep 08 2016 2:15pm
Forum: EBike Non-hub Motor Drives
Topic: Took my 13 year old son for a ride today.
Replies: 7
Views: 1099

Re: Took my 13 year old son for a ride today.

Hi Matt, I can't think why you waited so long! (Maybe you didn't have anything in your garage with less than 40Kw available??) A couple of years ago I built an electric minibike for my 4 yr old grandson. It took him about 10 minutes to get the basic idea of controlling it, and the rest of the day to...
by Drum
Nov 02 2015 3:20am
Forum: EBike Non-hub Motor Drives
Topic: BIG BLOCK alternative Motor
Replies: 452
Views: 97917

Re: BIG BLOCK alternative Motor

The first page of this thread contains photos of the motor opened up, and quite a lot of information posted by Crossbreak and BZH. From memory (don't trust me.. check for yourself) it has 12 magnets on the rotor, 18 coils in the stator = 3 phases of 6 poles each, so is a 6 pole motor. One day soon I...
by Drum
Aug 16 2015 8:48pm
Forum: EBike Non-hub Motor Drives
Topic: Rc motor Gearbox
Replies: 12
Views: 1172

Re: Rc motor Gearbox

Having trouble posting.. Hope this doesn't appear twice.. Just remembered that on the one at work the input gear of the gearbox is actually machined into the shaft of the motor, so the gearbox by itself would be useless as there would be no input gear. You would need the matching motor shaft as well...
by Drum
Aug 16 2015 8:23pm
Forum: EBike Non-hub Motor Drives
Topic: Rc motor Gearbox
Replies: 12
Views: 1172

Re: Rc motor Gearbox

I have a very similar gearbox on a 500 Watt motor on a small packaging machine at work. Oriental motor have a good reputation for reliability but I doubt the manufacturer intended them for use at the rpm you would be using I would think a change to a light gear oil might be needed... I doubt the gre...