Search found 1354 matches

by Balmorhea
Nov 28 2020 4:15pm
Forum: Battery Technology
Topic: Question regarding 52V VS 60V Battery
Replies: 1
Views: 219

Re: Question regarding 52V VS 60V Battery

You will see increased torque, power, and speed. It won't be in exact proportion to the increase in voltage, but pretty close. Maybe 10% higher top speed, if you're lucky.
by Balmorhea
Nov 22 2020 11:33pm
Forum: Bike Mechanical & Structural
Topic: 20" bicycle rim / 16" moped rim, 50mm+ wide
Replies: 14
Views: 811

Re: 20" bicycle rim / 16" moped rim, 50mm+ wide

goatman wrote:
Nov 22 2020 11:03pm
i use that weissman fat rim from grin but in 24 inch with dual gauge spokes at 3000 watts and its been excellent
I've used that rim in 26" and 29", for hub motors and pedicab wheels, and it's as good as I've found for heavy loads. I didn't know there was a 20" version.
by Balmorhea
Nov 22 2020 9:57pm
Forum: Bike Mechanical & Structural
Topic: 20" bicycle rim / 16" moped rim, 50mm+ wide
Replies: 14
Views: 811

Re: 20" bicycle rim / 16" moped rim, 50mm+ wide

goatman wrote:
Nov 22 2020 8:11pm
grin sells them
https://ebikes.ca/shop/electric-bicycle ... 0-fat.html
That's new to me. Good find. New first choice
by Balmorhea
Nov 22 2020 7:24pm
Forum: EBike General Discussion
Topic: 52V Battery wont charge past 80%
Replies: 4
Views: 308

Re: 52V Battery wont charge past 80%

If you have a charger that won't go above 58.8V under any circumstances, then charge the battery directly from its leads, bypassing the BMS. If it takes and holds a charge at a higher voltage, then your problem is the BMS. It should go without saying, but if you conduct this experiment, do it in a l...
by Balmorhea
Nov 22 2020 5:12pm
Forum: Bike Mechanical & Structural
Topic: 20" bicycle rim / 16" moped rim, 50mm+ wide
Replies: 14
Views: 811

Re: 20" bicycle rim / 16" moped rim, 50mm+ wide

The very strongest, heaviest freestyle rims (e.g. Alex Supra E) are all out of production, so you'll only find them as old stock or salvage. Some people consider this stuff collectible, which hurts price and availability. Others include Alex Supra RX, Peregrine Mad Max, Sun Big City, Odyssey Hazard,...
by Balmorhea
Nov 22 2020 1:11pm
Forum: Battery Technology
Topic: which solder to use and is this right?
Replies: 9
Views: 450

Re: which solder to use and is this right?

Lead free? That's another matter, and something to steer clear of. why stay free of lead-free tinning flux? been using it for 2 years with no battery issues and ive soldered up 5 packs using it I was talking about solder, not flux. Lead free solders have higher melting points and poor wetting compa...
by Balmorhea
Nov 21 2020 11:38pm
Forum: Battery Technology
Topic: which solder to use and is this right?
Replies: 9
Views: 450

Re: which solder to use and is this right?

also what will the difference be if i use 63/37 vs 60/40? is that better recommended for electrical reasons or just solder preference? No practical difference either way. The performance of the flux in the core will make more difference than the alloy. Lead free? That's another matter, and somethin...
by Balmorhea
Nov 21 2020 1:27am
Forum: EBike General Discussion
Topic: Your thoughts on frames and riding positions?
Replies: 40
Views: 1599

Re: Your thoughts on frames and riding positions?

Price is a huge problem. I just plopped down $1900 on what's basically a next generation bikeE. The bikeE was mass manufactured and the entry price was something like $500. From what I heard at the time, every single BikeE-- from beginning to end-- was sold at a loss, in anticipation of a rapidly g...
by Balmorhea
Nov 21 2020 1:20am
Forum: EBike General Discussion
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1963
Views: 253622

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

In the long term, I'm going to want more power than the Leafbike motor can provide. A similar sized hub motor with a higher peak efficiency and good mechanical robustness would allow that, but there is nothing of that sort on the market that can accept a bicycle cassette or freewheel. I need the mo...
by Balmorhea
Nov 21 2020 1:10am
Forum: Battery Technology
Topic: Mistory cells?
Replies: 36
Views: 1020

Re: Mistory cells?

Those cells look a whole lot like PHEV2. That's a cell dimensions standard for plug hybrid death machines. I use those cells in one of my bike batteries. Here's a not-one-of-my-batteries that I had a part in building, that uses PHEV2 cells: IMG_20190107_170922.jpg You can look up the PHEV2 standard ...
by Balmorhea
Nov 21 2020 12:24am
Forum: EBike General Discussion
Topic: seeking 20" front fat tire hub motor
Replies: 10
Views: 479

Re: seeking 20

I see theres a little bump out on the inside of the fork, would that be the missing 1mm or what is the little bump, whys it there. Do most forks have that. That's the "positive front wheel retention device" required by the US Consumer Products Safety Commission since the early '80s or so....
by Balmorhea
Nov 20 2020 5:00pm
Forum: EBike General Discussion
Topic: seeking 20" front fat tire hub motor
Replies: 10
Views: 479

Re: seeking 20

john61ct wrote:
Nov 20 2020 3:45pm
Balmorhea wrote:Grin All-axle is a 100mm front hub.
As opposed to?

Are you saying you know the width OP needs?

How?
In the photo above, the caliper reads 134mm. 135mm is typical for fatty bike front forks.
by Balmorhea
Nov 20 2020 3:23pm
Forum: EBike General Discussion
Topic: seeking 20" front fat tire hub motor
Replies: 10
Views: 479

Re: seeking 20

Grin All-axle ? Grin All-axle is a 100mm front hub. OP is going to have to relent and get a flatted axle motor. It might hurt his feelings to have the rotor riding 2mm lower on the pads, but it won't make any difference in braking. For a junky kid bike, I'd get a cheap 48V geared hub (with overrunn...
by Balmorhea
Nov 20 2020 5:28am
Forum: Battery Technology
Topic: RIP BMS?
Replies: 6
Views: 460

Re: RIP BMS?

I would not tolerate a BMS that has already done something screwy. It's your last line of defense against a ruined battery or a fire. If it doesn't seem to work right, assume that it doesn't. They're not expensive or hard to find. Get a new one. https://www.ebay.com/itm/DALY-BMS-Li-ion-10S-36V-60A-C...
by Balmorhea
Nov 20 2020 5:00am
Forum: EBike General Discussion
Topic: torque arms for using regen?
Replies: 49
Views: 1723

Re: torque arms for using regen?

You're at risk of overthinking this, a lot. For most torque arms, the first thing to fail will be the flats in the axle hole of the arm. But we know most torque arms are some degree of crappy. So if you use good material, adequate thickness, close fit to the axle... then maybe you discover that the ...
by Balmorhea
Nov 20 2020 4:41am
Forum: EBike Technical
Topic: Bike runs for 1' then motor cuts out
Replies: 15
Views: 518

Re: Bike runs for 1' then motor cuts out

Sounds like a bunk battery to me. Either the BMS is tripping, or the controller LVC is tripping. Could be that the new controller demands more current than the old one, and more than the battery can supply. We have 3 12V batteries in series, they're pretty hefty, not as big as car batteries but big...
by Balmorhea
Nov 19 2020 5:56am
Forum: General Discussion
Topic: Adding pictures?
Replies: 224
Views: 408568

Re: Adding pictures?

That’s not the problem we’re dealing with.
by Balmorhea
Nov 19 2020 5:48am
Forum: EBike Technical
Topic: Bike runs for 1' then motor cuts out
Replies: 15
Views: 518

Re: Bike runs for 1' then motor cuts out

Sounds like a bunk battery to me. Either the BMS is tripping, or the controller LVC is tripping. Could be that the new controller demands more current than the old one, and more than the battery can supply.
by Balmorhea
Nov 19 2020 12:41am
Forum: EBike Non-hub Motor Drives
Topic: Wheel diameter to speed/RPM chart
Replies: 14
Views: 110775

Re: Wheel diameter to speed/RPM chart

What if I want to make a Gilligan's island generator? meaning take a bicycle or a even an exercise bike and hook a belt around the drive rim, with no tire on, it just the rim, connected to a car alternator. How do I figure out how fast I need to either pedal or how big your how small the pulleys I ...
by Balmorhea
Nov 19 2020 12:25am
Forum: General Discussion
Topic: Adding pictures?
Replies: 224
Views: 408568

Re: Adding pictures?

amberwolf wrote:
Nov 19 2020 12:20am
Is it just me, or is adding attachments broken at the moment?
That’s what I’m getting when I try to attach an image.
by Balmorhea
Nov 19 2020 12:21am
Forum: Motor Technology
Topic: Servo Motor with driver board--useful?
Replies: 1
Views: 161

Re: Servo Motor with driver board--useful?

You could use a bunch of those to drive pushrods for a steam engine style propulsion system. You notice perhaps that I used the word “style” rather than a more tightly definable term. But it could definitely have that.
by Balmorhea
Nov 19 2020 12:03am
Forum: Battery Technology
Topic: Mistory cells?
Replies: 36
Views: 1020

Re: Mistory cells?

This is so freaking annoying the largest file you can upload is 512 megabytes and the smallest picture I have is 3.5gig so I'm not sure when the computer software was written for this website possibly 1981? Because I don't know of any modern day picture that's only 512 megabytes smh..... Looks like...
by Balmorhea
Nov 18 2020 7:52pm
Forum: EBike General Discussion
Topic: Ebike not working motor cuts out...
Replies: 12
Views: 954

Re: Ebike not working motor cuts out...

Crappy battery. It's 39 cells, 13s-3P. You might be looking at 6AH-7AH, not 99.999AH. It's typical (and stupid) for power bank and jumpstart pack manufacturers to claim an Ah capacity based on the sum of all the individual cells' Ah capacities. So under those labeling customs, if the 39 cells in th...
by Balmorhea
Nov 18 2020 7:33pm
Forum: EBike General Discussion
Topic: Your thoughts on frames and riding positions?
Replies: 40
Views: 1599

Re: Your thoughts on frames and riding positions?

It's actually more like observing that hamburgers are more common than peanut butter and pickle sandwiches.

Nothing wrong with a good PB&P, if that's how you roll.
by Balmorhea
Nov 18 2020 5:29pm
Forum: EBike General Discussion
Topic: Your thoughts on frames and riding positions?
Replies: 40
Views: 1599

Re: Your thoughts on frames and riding positions?

Recumbents were banned by the UCI in 1934 when an average rider was repeatedly clobbering everyone. That's why you never see a company make a flagship recumbent bike and you never see one in a race. Most of the regular, y'know, normal boring bikes out there are not UCI rules compliant, because they...