Search found 7569 matches

by Chalo
Mar 08 2021 1:16am
Forum: EBike General Discussion
Topic: Please help me critique my dream ebike.
Replies: 28
Views: 687

Re: Please help me critique my dream ebike.

sean1072 wrote:
Mar 07 2021 2:16am
no need for suspension with fat tires, i have 4.9 back and 5.2 front fat tires at 3-5 psi, no suspension frame at all and im just floating over everything at 60mph
3 psi tire at 60 mph sounds like a recipe for overheating and delamination.
by Chalo
Mar 08 2021 1:13am
Forum: EBike General Discussion
Topic: 1 1/8" forks on 1" frame???? :S
Replies: 6
Views: 97

Re: 1 1/8" forks on 1" frame???? :S

No bodge required, adapter just works That seems okay if you make the cups to fit the OD of the specific head tube, and if your head tube is relatively short and the steer tube made from steel. The clearance between a 28.6mm steer tube and a 1" head tube that is reamed to 30.0mm or 30.2mm on t...
by Chalo
Mar 08 2021 12:31am
Forum: E-Scooter and Motorcycle Build Threads
Topic: Electric Roadster
Replies: 109
Views: 5472

Re: Electric Roadster

As long as you use the "alternate" right turn signal and not the original one, you will keep your arms. I've been using them since about 1976, on motorcycles first and now bicycles. The original version of the right turn was worthless anyway: 9 out of 10 people think you are waving at the...
by Chalo
Mar 07 2021 5:26pm
Forum: EBike General Discussion
Topic: 1 1/8" forks on 1" frame???? :S
Replies: 6
Views: 97

Re: 1 1/8" forks on 1" frame???? :S

By the time you get finished bodging something together that makes another problem for you later, you'll have spent more time, effort, and resources on doing the job poorly than you would have acquiring a more suitable frame. I once retrofitted a 1" frame MTB with a super heavy duty 1" for...
by Chalo
Mar 07 2021 1:03pm
Forum: E-Vehicles General Discussion
Topic: The Onecycle build. My self balancing single wheeled e-bike(?)
Replies: 6
Views: 356

Re: The Onecycle build. My self balancing single wheeled e-bike(?)

If you want to throw lots of money at it, there are 30" rims and radial tires for custom motorcycles.

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by Chalo
Mar 07 2021 9:41am
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 31
Views: 559

Re: Friction *regen brake* sanity check

BalorNG wrote:
Mar 07 2021 8:42am
I expect regen efficiency around 85%, that's what actual measured no-load torque and motor resistance tell me,
Expect around half that efficiency if you use a friction roller. The more braking power you can apply, the more of it you'll lose to friction and hysteresis.
by Chalo
Mar 06 2021 8:36pm
Forum: EBike Troubleshooting
Topic: Throttle wired wrong?
Replies: 4
Views: 86

Re: Throttle wired wrong?

If I had a bike with that problem, I'd replace the plug or rearrange the terminals in it, so that it would work correctly with whatever throttles I want to use. Don't get hung up on the color code if it's incorrect. One of the wires is +5V from the controller, one is GND, and the third one is for th...
by Chalo
Mar 06 2021 12:04pm
Forum: E-Scooter and Motorcycle Build Threads
Topic: Electric Roadster
Replies: 109
Views: 5472

Re: Electric Roadster

I have about 35 years in city traffic, in cities that rank among the top 20 US cities by population. Those are the only signals I've had for most of that time. But I do enjoy hearing uninformed opinions from folks who are too chicken-hearted to actually try it and see. ...and I do enjoy hearing fro...
by Chalo
Mar 06 2021 12:02pm
Forum: E-Scooter and Motorcycle Build Threads
Topic: Electric Roadster
Replies: 109
Views: 5472

Re: Electric Roadster

As long as you use the "alternate" right turn signal and not the original one, you will keep your arms. I've been using them since about 1976, on motorcycles first and now bicycles. The original version of the right turn was worthless anyway: 9 out of 10 people think you are waving at the...
by Chalo
Mar 05 2021 7:55pm
Forum: E-Scooter and Motorcycle Build Threads
Topic: Electric Roadster
Replies: 109
Views: 5472

Re: Electric Roadster

Don't you think it's quite dangerous driving in city traffic without turn signals? https://bloximages.newyork1.vip.townnews.com/ocolly.com/content/tncms/assets/v3/editorial/e/01/e014a01a-853c-11e2-af13-001a4bcf6878/513559518179f.image.jpg LOL If you would use theses signals around here where I live...
by Chalo
Mar 05 2021 7:44pm
Forum: E-Scooter and Motorcycle Build Threads
Topic: Electric Roadster
Replies: 109
Views: 5472

Re: Electric Roadster

Elektrosherpa wrote:
Mar 05 2021 7:31pm
Don't you think it's quite dangerous driving in city traffic without turn signals?


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by Chalo
Mar 03 2021 12:54am
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 31
Views: 559

Re: Friction *regen brake* sanity check

The GMAC does drag, due to the locked clutch that allows it to do regen. It definitely drags-- more so than something like a direct drive Leaf motor, in my observation. Maybe a bit of exaggeration by Grin, but they seem convinced it is less than a DD hub. Interesting. Maybe at speed? I can only com...
by Chalo
Mar 02 2021 1:10pm
Forum: EBike Non-hub Motor Drives
Topic: Friction *regen brake* sanity check
Replies: 31
Views: 559

Re: Friction *regen brake* sanity check

GMAC hub motor with locked clutch: no drag and does regen. It definitely drags-- more so than something like a direct drive Leaf motor, in my observation. I would count it, along with all direct drive motors, as categorically unsuitable for long distance touring. Gotta have some kind of clutch to d...
by Chalo
Mar 01 2021 11:12am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1928
Views: 250379

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

I didn't think Chalo would make such an oversight (about the torque at the threads vs the gear ratio/chain tension) :) I could see the cycles of impulse causing metal fatigue. So you're saying each tooth on the sprocket engaging and disengaging with the chain causes pulses in the amount of torque t...
by Chalo
Mar 01 2021 2:17am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1928
Views: 250379

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

Torque at the freewheel thread would be the same given the same gearing ratio, But it isn't torque that breaks hub motor sidecovers; it's the bending moment of the chain pulling on the freewheel or cassette. Steady torque is a static force, but chain tension cycles around with the wheel's rotation,...
by Chalo
Mar 01 2021 2:10am
Forum: EBike General Discussion
Topic: Please help me critique my dream ebike.
Replies: 28
Views: 687

Re: Please help me critique my dream ebike.

Let us know when you break your hub motor's right sidecover. Could you explain to me how this failure occurs? Is it simply from the torque of the mid drive turning over the freewheel during normal operation? or is it from the chain becoming out of alignment and ripping/pulling on the freewheel? Hub...
by Chalo
Feb 28 2021 8:54pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1928
Views: 250379

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

I ordered the cassette version because at the time I could not readily find 7 speed freewheels with an 11T small cog, and it appeared as if the only one on the market, the DNP Epoch, was being discontinued DNP freewheels are pretty junky and failure prone. There's another concern when setting up ge...
by Chalo
Feb 28 2021 8:03pm
Forum: EBike General Discussion
Topic: Please help me critique my dream ebike.
Replies: 28
Views: 687

Re: Please help me critique my dream ebike.

s1dewinder wrote:
Feb 27 2021 11:55am
Dual electric rear wheel drive: mid drive+direct drive rear hub (don't try to stop me, this element is non-negotiable)
Cool-- great way to drive away knowledgeable help.

Let us know when you break your hub motor's right sidecover.
by Chalo
Feb 26 2021 10:20am
Forum: E-Vehicles General Discussion
Topic: Can Tesla converted to diesel?
Replies: 22
Views: 514

Re: Can Tesla converted to diesel?

It sounds like you could use portal axles, which will give you gear reduction plus extra ground clearance. Thank you! It is very good idea! A quick search returns with ZF electric portal axle. https://www.youtube.com/watch?v=23-i0niqDP4&ab_channel=ZFGroup 250KW / 22.000 NM! No need that yellow ...
by Chalo
Feb 24 2021 6:34pm
Forum: EBike Build Threads
Topic: Can I and should I do this
Replies: 12
Views: 334

Re: Can I and should I do this

with disc mounts if you must have disc brakes (they don't improve anything except your bike's cleanliness). Not to restart that old argument, but it depends on what you are starting with. Take a spin on an EZIP trails with rim brakes, and you will appreciate disks more. I've dealt with cheap and aw...
by Chalo
Feb 24 2021 5:27pm
Forum: EBike Build Threads
Topic: Can I and should I do this
Replies: 12
Views: 334

Re: Can I and should I do this

Hi everyone. New here and need your help. I have an older (mid 1990s) Dean Titanium Bicycle that weighs about 12 lbs loaded. No, it doesn't. I’m thinking of making it an e bike. Don't do that. You'll only screw up a nice pedal bike, and not enjoy any of its nicer qualities after your convert it. If...
by Chalo
Feb 24 2021 5:16pm
Forum: E-Vehicles General Discussion
Topic: Can Tesla converted to diesel?
Replies: 22
Views: 514

Re: Can Tesla converted to diesel?

I'm planning to built a 4x4 off road vehicle and I would like to feed all 4 DC hub motors with 50 kw diesel with DC generator. [...] but I need a very low rpm engine since tyres are big and vehicle speed will be limited to 40 mph. It sounds like you could use portal axles, which will give you gear ...
by Chalo
Feb 22 2021 3:14am
Forum: EBike General Discussion
Topic: Help with an e-bike for my courier job
Replies: 20
Views: 552

Re: Help with an e-bike for my courier job

I want to go 15-20 mph for 10 hours. I'm wanting a 150-200 mile range. As others have said... naw. Instead plan on having multiple packs that you can rotate out, running one while others are charging. This is how festival pedicabbers get the endurance you're looking for. You can probably reduce you...
by Chalo
Feb 20 2021 2:30am
Forum: Battery Technology
Topic: Trying to increase my batteries longevity but did i actually destroy it doing so?
Replies: 22
Views: 544

Re: Trying to increase my batteries longevity but did i actually destroy it doing so?

If the pack you have tends to become unbalanced, consider adding one of these: https://www.ebay.com/itm/4S-8S-13S-20S-Lithium-Battery-Active-Equalizer-Protection-Board-Balance-Board/383907966158 This is one example out of many such boards that are available. It will balance the cells whenever an imb...
by Chalo
Feb 19 2021 2:31am
Forum: EBike Build Threads
Topic: New build help. Is this safe?
Replies: 28
Views: 914

Re: New build help. Is this safe?

Yeah, I tend to believe cheap BMSs cause about as many dangers and problems as they solve. I get the rationale for pack sellers trying to idiot-proof their product, but I'd rather move the balancing hardware off the bike and run the proven fast-blow ANN fuse for overcurrent protection. This implies...