Search found 167 matches

by Drum
Feb 08, 2018 2:31 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Kuberg Freerider Extended Swingarm Project
Replies: 84
Views: 6065

Re: Kuberg Freerider Extended Swingarm Project

Hi Skeet, If there is continuity between battery negative and hall sensor negative, that is good.. connect the negative of the 9V battery to either the battery negative or the hall negative, and the +9V of the battery to the hall sensor supply Positive. (You will have to disconnect the hall sensor +...
by Drum
Feb 07, 2018 2:51 pm
Forum: E-Bike Non-hub Motor Drives
Topic: izip my1018z motor question
Replies: 4
Views: 111

Re: izip my1018z motor question

Hi Roadstar, I don't have personal experience with that particular motor, but I have noticed with other brushed motors in the past that sometimes the brushes make a noise when the commutator is turned in one direction but not the other. Is the motor that makes the noise new or used? Hard to judge wi...
by Drum
Jan 18, 2018 7:08 pm
Forum: E-Bike Non-hub Motor Drives
Topic: How to drive ebike using outrunner?
Replies: 6
Views: 338

Re: How to drive ebike using outrunner?

Several people have put a second drive chain on the left side of the bike, driving from the motor to a sprocket mounted to the 6 bolt holes for the disc brake. Obviously the sprocket has to be on a flange that moves it inward slightly, and the disc ends up moving outwards slightly, so it would depen...
by Drum
Jan 18, 2018 5:28 pm
Forum: Items for Sale - New
Topic: FREY eMTB with Bafang m600 is developing with your ideas!
Replies: 48
Views: 2148

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

"I would be curious to know if the 148mm x 12mm boost spacing and axles are part of the reason to deal with side force? I only ask because I noticed a significant difference in stiffness when I went to a 140mm x 12mm rear frame on my Ellsworth Epiphany." Hi DDFred, I guess as tyres get wider the cha...
by Drum
Jan 17, 2018 3:06 pm
Forum: Items for Sale - New
Topic: FREY eMTB with Bafang m600 is developing with your ideas!
Replies: 48
Views: 2148

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

When designing the rear suspension, keep the bearings for the main swing arm as wide apart as possible, to reduce the maximum force on them and keep the back end as stiff as possible. Three reasons: -The chain forces on e-bikes are greater than normal bikes, and there are reports of frames bending s...
by Drum
Jan 10, 2018 4:11 pm
Forum: Items for Sale - New
Topic: FREY eMTB with Bafang m600 is developing with your ideas!
Replies: 48
Views: 2148

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

Hi Fred,
Could you please copy the website address for the G521 kit and post it? I can't find any webpage showing the unit or kit for sale..

Thanks
Dave
by Drum
Jan 09, 2018 3:53 pm
Forum: Items for Sale - New
Topic: FREY eMTB with Bafang m600 is developing with your ideas!
Replies: 48
Views: 2148

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

Looking at the Bafang website, they offer a mounting bracket for the m500 & m600 motors: http://www.bafang-e.com/en/components/component/accessoires/fp-g520.html This looks like the part that surrounds / mounts the motor and forms the bottom of the frame on the blue bike shown a few posts ago. It ap...
by Drum
Jan 07, 2018 3:27 pm
Forum: Items for Sale - New
Topic: FREY eMTB with Bafang m600 is developing with your ideas!
Replies: 48
Views: 2148

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

"What other models have you read about that get good reviews?" Several of the bikes I have read about get good overall reviews, but the one that seems to get the best comments ("Climbs well, descends well, great fun to ride, no weaknesses, has agility and stability" type of comment) is the Merida e-...
by Drum
Jan 07, 2018 2:41 am
Forum: Items for Sale - New
Topic: FREY eMTB with Bafang m600 is developing with your ideas!
Replies: 48
Views: 2148

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

Geometry: The Torbo Levo gets good reviews for its handling, but there are others that get better, so here's my take on the geometry. Head tube angle: between 66 & 67 degrees Seat tube angle: 75 degrees Chainstay length (Bottom Bracket to rear axle): 440mm or as close as you can get to that figure a...
by Drum
Jan 06, 2018 11:47 pm
Forum: Items for Sale - New
Topic: FREY eMTB with Bafang m600 is developing with your ideas!
Replies: 48
Views: 2148

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 7:21 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-ron Adaptto
Replies: 31
Views: 2171

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 your momentum in...
by Drum
Jan 03, 2018 7:04 pm
Forum: E-Bike Non-hub Motor Drives
Topic: 02 Jamis Dakar Comp mid drive choice
Replies: 12
Views: 943

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. I think one sprocke...
by Drum
Dec 08, 2017 4:13 am
Forum: E-Bike Non-hub Motor Drives
Topic: My Bafang Ultra Mountain Bike! Frey AM1000
Replies: 367
Views: 18696

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 be at each "torque" (...
by Drum
Dec 07, 2017 11:24 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike from China
Replies: 508
Views: 27402

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 5:54 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike from China
Replies: 508
Views: 27402

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 2:51 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike from China
Replies: 508
Views: 27402

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 3:58 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Revolt 120 pro eTrial overheating problem
Replies: 60
Views: 5640

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 7:15 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Trial riders need their clutch?
Replies: 57
Views: 2045

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 energy in the c...
by Drum
Oct 11, 2017 3:28 pm
Forum: E-Bike Non-hub Motor Drives
Topic: high RPM rc motor
Replies: 10
Views: 897

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 7:21 pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 1507
Views: 112007

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 2:39 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Freewheeling Design for the Shimano Hollowtec II Crankset
Replies: 42
Views: 1369

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 research on ava...
by Drum
Sep 15, 2017 3:48 am
Forum: E-Bike Non-hub Motor Drives
Topic: Merida eOne sixty
Replies: 3
Views: 577

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). Very very...
by Drum
Sep 15, 2017 3:14 am
Forum: E-Bike Non-hub Motor Drives
Topic: 4KW Bikee Bike Mid Drive System Made in Italy
Replies: 4
Views: 885

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 sine wave ...
by Drum
Aug 26, 2017 12:33 am
Forum: E-Bike Non-hub Motor Drives
Topic: Recommended trigger shifters
Replies: 5
Views: 321

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 enough for mos...
by Drum
May 12, 2017 2:27 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Direct Drive Genesis
Replies: 350
Views: 39121

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 ...