Search found 7729 matches

by Chalo
May 05 2021 12:58am
Forum: Bike Mechanical & Structural
Topic: Welding down a torque arm
Replies: 42
Views: 787

Re: Welding down a torque arm

Here are a few more pics. Dude. Those forks are janky AF. Would you use them as a wrench? No you would not. That makes them unsuitable for restraining axle torque. In the USA, squashed-tube fork tips like that are common only on department store bikes from the 20th century. Is that what you're using?
by Chalo
May 05 2021 12:51am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 886

Re: E-bike mid-drive motors hardly outperforms hub motors

With which he doesn't disagree - hub drive sacrifices performance. Everyone understands that, and why it is. But how much? Apparently not very much. Maybe it would be clearer if the graphs were superimposed? Maybe his analysis is bogus? In my observation, 2/3 as much peak power resulted in indisput...
by Chalo
May 04 2021 12:05pm
Forum: E-Vehicles General Discussion
Topic: Aptera is gone for good. :'(
Replies: 114
Views: 13189

Re: Aptera is gone for good. :'(

Found this from a local TV station today:
by Chalo
May 04 2021 11:59am
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 37
Views: 886

Re: E-bike mid-drive motors hardly outperforms hub motors

I wrote an article where you can read that a mid-drive motor hardly outperforms a hub motor. Meanwhile, back in the real world, some of us have had both. I've had both. My current hub motor bikes both peak near 1900W (electrical) on a freshly topped up battery. My former mid drive bike peaked at ab...
by Chalo
May 04 2021 11:38am
Forum: EBike General Discussion
Topic: Looking for a 20" foldable fat tire bike that is not an ebike
Replies: 5
Views: 145

Re: Looking for a 20" foldable fat tire bike that is not an ebike

I really, really doubt it. Everything about those bikes makes them unpleasant and extremely slow to pedal. When folded, they're several times as bulky as a real folding bike. A pedal-only version of such a thing would have at best a very limited market (of self-pwning dudes). Only adding a motor mak...
by Chalo
May 04 2021 1:31am
Forum: EBike Build Threads
Topic: Xtracycle Build Log
Replies: 67
Views: 5819

Re: Xtracycle Build Log

The throttle I bought has issues, namely a very narrow range of input. I'm either too slow or full bore. Hard to get any throttle values in between. Are you using the Wuxing 130X throttle? https://img.alicdn.com/imgextra/i1/6000000001182/O1CN010kyoAC1KbOdzFPDPa_!!6000000001182-0-tbvideo.jpg If so, ...
by Chalo
May 04 2021 1:07am
Forum: Battery Technology
Topic: Ebike Battery stored for a long time
Replies: 23
Views: 652

Re: Ebike Battery stored for a long tome

Some of the old Giant bikes used 24v (about 29v full) NiCd or NiMH batteries, which don't typically have a BMS. That's a good point. I associate this chemistry only with LaFree bikes made by Giant, but surely there were others. If you open the pack and find the cells are in a series of 20 or 21 gro...
by Chalo
May 03 2021 10:32pm
Forum: Battery Technology
Topic: Ebike Battery stored for a long time
Replies: 23
Views: 652

Re: Ebike Battery stored for a long tome

The best way to check the health of the battery is to charge it up, open it, and check the voltage of each individual cell group. Then run it down somewhat, and check the cell group voltages again. If they're pretty much the same overall, that's good. If there's one or more group that has different ...
by Chalo
May 03 2021 3:01pm
Forum: EBike Troubleshooting
Topic: SOLVED! Blown Controller Mosfets!Is it worth replacing?
Replies: 15
Views: 411

Re: Blown Controller Mosfets!Is it worth replacing?

There could easily be other things in there that got fried by the voltage transients. But if you're game to swap MOSFETs, that's at least a cheap thing to try and see if it works.
by Chalo
May 03 2021 1:38pm
Forum: EBike General Discussion
Topic: Custom fiberglass / carbon frame battery case
Replies: 8
Views: 423

Re: Custom fiberglass / carbon frame battery case

A lot of epoxies are fortified with metal (steel, silver, copper, etc.) in order to provide greater strength (doesn't compress/deform), but that also makes them conductive. I know of no metal filled thermal or structural epoxies that are conductive. Even silver filled thermal paste is generally not...
by Chalo
May 03 2021 11:37am
Forum: EBike Troubleshooting
Topic: Wilderness energy motor has additional drag.
Replies: 3
Views: 106

Re: Wilderness energy motor has additional drag.

Is it the brushed kind, or brushless? The brushed version has only two wires going into it. Does it free up when you unplug it from the controller? If so, your controller has a problem. If it's still draggy when it's unplugged, then you have an electrical short (between phases inside or somewhere al...
by Chalo
May 03 2021 11:31am
Forum: Bike Mechanical & Structural
Topic: Welding down a torque arm
Replies: 42
Views: 787

Re: Welding down a torque arm

Even cheap torque arms typically work fine as long as axle nuts are nice and tight. Once regen is introduced all through hole torque arms are proven inadequate in the long run [...] Seems like you've identified the easily preventable part of the problem. You don't have to use regen, even if you can...
by Chalo
May 03 2021 1:03am
Forum: Bike Mechanical & Structural
Topic: Welding down a torque arm
Replies: 42
Views: 787

Re: Welding down a torque arm

Those types of torque arms are terrible and always deform. No name Chinese versions, yes. They have soft metal and loose fit, in my observation so far. Grin TAs and carefully handmade ones seem to work just fine. Just make a good torque arm that is both thick and has a bolt for a clamp tight fit on...
by Chalo
May 03 2021 12:42am
Forum: EBike Non-hub Motor Drives
Topic: Which geared hub for BBSHD in a full-fat tandem trike?
Replies: 12
Views: 354

Re: Which geared hub for BBSHD in a full-fat tandem trike?

Rohloff isn't as robust as NuVinci N171. Its rating for gross power is the same as the later, lighter Nuvinci/Enviolo hubs. Wow yes 130Nm peak! So despite both being rated the same, what makes the Rohloff "less robust"? N171 is rated 5kW. Rohloff is rated 2500W, same as N360 and its sibli...
by Chalo
May 02 2021 7:55pm
Forum: EBike Non-hub Motor Drives
Topic: Which geared hub for BBSHD in a full-fat tandem trike?
Replies: 12
Views: 354

Re: Which geared hub for BBSHD in a full-fat tandem trike?

I visualize the Rohloff as a must-have for heavy tandem/cargo scenarios using mid-drives. Especially if hills are in the picture, and **most** especially if human power is anything more than an afterthought. As for the cost issue, just like spending thousands on excellent battery packs my rationali...
by Chalo
May 02 2021 4:47pm
Forum: EBike Non-hub Motor Drives
Topic: Which geared hub for BBSHD in a full-fat tandem trike?
Replies: 12
Views: 354

Re: Which geared hub for BBSHD in a full-fat tandem trike?

If Rohloff is too spendy, then that leaves Nuvinci. N171 is rated 5kW and N3XX/Enviolo is rated 2.5kW (in both cases assuming compliance with input torque limits).

Under no circumstances would I use Alfine 8 to carry the power of BBSHD plus two people pedaling.
by Chalo
May 02 2021 12:50am
Forum: Battery Technology
Topic: is there a prob in this battery diy plan with prebuid case?
Replies: 41
Views: 1701

Re: is there a prob in this battery diy plan with prebuid case?

[could you paste the spec of the cell you talk about , their price and a short pros and cons of using them instead on 18650 I'm not recommending any specific cell; there are at least dozens of cells to choose from in the capacity range you want. Use a search engine on "lithium ion 10Ah cell&qu...
by Chalo
May 01 2021 12:57pm
Forum: EBike General Discussion
Topic: Bafang front wheel Uber motors - which controller
Replies: 84
Views: 2270

Re: Bafang front wheel Uber motors - which controller

[Mr Yellow is from 1988, I was intending to replace the cantilever brakes with v-brakes, Do it or leave it as is? it brake fine with what is on it now. If it aint broke then do not fix it. You would find that the post are likely not compatible anyway. 10-4 I will leave it alone, I need to adjust th...
by Chalo
May 01 2021 11:24am
Forum: Bike Mechanical & Structural
Topic: My model of spoke breakage.
Replies: 19
Views: 777

Re: My model of spoke breakage.

Dang, that's a weird lacing your seller used. I've done some similarly strange stuff when there was no other way, but in this case I think they needed to source the right spokes. Here's a wheel I worked out with 3 different spoke lengths. I don't love it. http://www.rideyourbike.com/36hub24rim.shtml...
by Chalo
May 01 2021 10:17am
Forum: Bike Mechanical & Structural
Topic: My model of spoke breakage.
Replies: 19
Views: 777

Re: My model of spoke breakage.

If we start from the assumption that the rim is strong enough and the spokes are sufficiently tightened, then what is still wrong with this approach? There's nothing wrong with using thick spokes and a rim that can tolerate proportionally high spoke tension. That's what wire wheel motorcycles do. B...
by Chalo
Apr 30 2021 7:35pm
Forum: EScooters/EMotorcycles
Topic: special pleading
Replies: 70
Views: 1942

Re: special pleading

These people are not " dumb ". They are disabled through age, accident or birth. Most people are dumb-- irrespective of age, accident, or birth. It's just the way things are. When you set up a machine for someone in particular, you can take into account their intelligence, sensitivity, an...
by Chalo
Apr 30 2021 11:34am
Forum: Bike Mechanical & Structural
Topic: My model of spoke breakage.
Replies: 19
Views: 777

Re: My model of spoke breakage.

The problem here is all of my wheel are built with used spokes so I don't know the mileage on them. This is why I think the model is correct. Spokes that are not adequately stress relieved when first built into a wheel will begin fatigue cracking very quickly. Once this process is initiated, it wil...
by Chalo
Apr 30 2021 11:07am
Forum: Bike Mechanical & Structural
Topic: My model of spoke breakage.
Replies: 19
Views: 777

Re: My model of spoke breakage.

Great, hope i'm right, i'll stick with 10 Ga, tightened sufficiently. hope the steel isn't 304ss I have a 42mm wide double walled rim which seems robust 10ga spokes probably won't break, but they'll go slack with every rotation because they have several times too much cross-section/not enough elast...
by Chalo
Apr 29 2021 9:17pm
Forum: EBike General Discussion
Topic: Converting a Bakfiets cargo bike
Replies: 50
Views: 4799

Re: Converting a Bakfiets cargo bike

If I understand how the caliper is arranged on the front fork, then the adapter should always be in rotational tension when it is applied. Braking force at the pads isn't aligned with the caliper mounting tabs, so there's a twisting component these bodged-on mounts are ill-equipped to control. I've...