Search found 7193 matches

by MadRhino
Apr 11 2021 5:07pm
Forum: EBike General Discussion
Topic: Tempted to lick my 50 volt battery
Replies: 54
Views: 888

Re: Tempted to lick my 50 volt battery

I think it’s as low as 50 milliamperes needed to possibly kill if the current is across the heart. Maybe with a large enough current even if I just touch the terminals to my tongue, it will still have part of the current across my heart and possibly kill me... Shorting a battery by touching both te...
by MadRhino
Apr 11 2021 12:20pm
Forum: EBike General Discussion
Topic: Tempted to lick my 50 volt battery
Replies: 54
Views: 888

Re: Tempted to lick my 50 volt battery

OK, serious answer. Fechter was giving you the opportunity to calculate the power that would cross your tongue tissues, but the battery current output is also required to do the math. People care about voltage but it is not the most dangerous factor. The current is the most important cause of damage...
by MadRhino
Apr 10 2021 5:05pm
Forum: EBike General Discussion
Topic: Last Piece of the Puzzle
Replies: 5
Views: 164

Re: Last Piece of the Puzzle

Pulling out a stucked seat post is not much of a problem. Use a slide hammer puller. You can make your own, or rent one. If the frame is steel you can heat it, but don’t if it is alu. Use Gunk penetrating oil, pour a few ounces into the seat post then rest the bike upside down overnight. The hammer ...
by MadRhino
Apr 10 2021 4:48pm
Forum: EBike General Discussion
Topic: Tempted to lick my 50 volt battery
Replies: 54
Views: 888

Re: Tempted to lick my 50 volt battery

Don’t go licking both + and - , way too predictable. Try putting the black in one ear and the red in the other one. It is likely to light up your eyeballs and shut off the stupid ideas center in your brain. Use high C-rate RC lipo for guaranteed spectacular results. NB: Speaking of your brain. You m...
by MadRhino
Apr 06 2021 11:44am
Forum: EBike General Discussion
Topic: Dual Motor Build for an Ice Adventure Trike
Replies: 14
Views: 379

Re: Dual Motor Build for an Ice Adventure Trike

... I hadn't considered a hub in the back with the IGH mounted mid. I didn't realize that was possible Well, that sprung to mind first to me when thinking a tadpole trike. Keeping the front lightweight and to have the freedom to deal with balance by batteries placement. Huge power on the rear, I’d ...
by MadRhino
Apr 06 2021 10:07am
Forum: EBike General Discussion
Topic: Dual Motor Build for an Ice Adventure Trike
Replies: 14
Views: 379

Re: Dual Motor Build for an Ice Adventure Trike

I would power it with one big motor on the rear. The IGH mounted mid frame and a single freewheel on the motor. Just my own view of performance and handling.
by MadRhino
Apr 05 2021 5:04pm
Forum: EBike General Discussion
Topic: Are footpegs superior if you don't pedal?
Replies: 36
Views: 5178

Re: Are footpegs superior if you don't pedal?

Fitting foot pegs on crank arms is kind of weird. Platform pedals are much more comfortable. Using the BB shell to fit pegs is logical but very unlikely to place them at the ideal spot if it is a simple straight mount. My guess for most frames would be to fit them 4’’ lower than the BB shell, and it...
by MadRhino
Apr 05 2021 4:50pm
Forum: EBike General Discussion
Topic: Mechanical (non spoke) adapters
Replies: 3
Views: 166

Re: Mechanical (non spoke) adapters

No such adapter available. You’d have to make it. There are some adapters for non flanged motors though, hard to find but they exist. Still, you’d have to cut off the spoke flange and shave the rotor external size to exact dimension. I would lace it. I mean, not an easy lacing job but it can be done...
by MadRhino
Apr 05 2021 1:22pm
Forum: EBike General Discussion
Topic: Segway vs. Sur-ron?
Replies: 11
Views: 4499

Re: Segway vs. Sur-ron?

Segway is selling the Surron under their name. There are many variations of the same bike, design and upgrade components. BUT, it is a kids bike size and it is not available larger. Build your own starting with an old DH racing bike of a proper size. It will make a much better ride and you can build...
by MadRhino
Apr 04 2021 4:42pm
Forum: EBike General Discussion
Topic: Need a 24-inch 36h rim that fits 24x3.0 tire.
Replies: 6
Views: 189

Re: Need a 24-inch 36h rim that fits 24x3.0 tire.

I like this one, that I ride on my city commuter. ERD 507, 57mm wide.

https://classic-cycle.com/all/1499/alu- ... atte?c=414
by MadRhino
Apr 03 2021 8:49am
Forum: EBike General Discussion
Topic: Rear derailleur cable attachment lever arm hits hub motor gears 3-6 on six speed freewheel.
Replies: 12
Views: 280

Re: Rear derailleur cable attachment lever arm hits hub motor gears 3-6 on six speed freewheel.

Different design derailleur would fix it. I never saw that one before here... The long cage derailer is for the extra large low gear cog, which IMO is totally useless with a motor. It is making a fragile shifting range with a big chain length difference that is hard to tune, and does detune quickly...
by MadRhino
Apr 02 2021 11:42pm
Forum: EBike General Discussion
Topic: Rear derailleur cable attachment lever arm hits hub motor gears 3-6 on six speed freewheel.
Replies: 12
Views: 280

Re: Rear derailleur cable attachment lever arm hits hub motor gears 3-6 on six speed freewheel.

I would solve the problem making a custom derailer hanger, if I would need all those gears. I really can’t see why you need the big ones.
by MadRhino
Apr 02 2021 6:03pm
Forum: EBike General Discussion
Topic: DIY handlebar shim ideas? Using 22.2mm Moto-x bars (same diameter as BMX) in my 31.8mm stem
Replies: 12
Views: 202

Re: DIY handlebar shim ideas? Using 22.2mm Moto-x bars (same diameter as BMX) in my 31.8mm stem

Stem/handlebar adapters are not expansive normally. For quite some time they were included with many stems and its is not uncommon to find some in junk boxes at bike shops. On Aliexpress they are 2$.
by MadRhino
Mar 31 2021 6:08pm
Forum: EBike General Discussion
Topic: Where to find brushed hub motors nowadays?
Replies: 12
Views: 393

Re: Where to find brushed hub motors nowadays?

Well, actually it would be pretty difficult to find brushed hub motors that are readily available today. Heinzmann still makes one, and a good one for what matters, but it is more expansive than brushless hubs and they won’t sell them by the units. I don’t know the minimal order but I suspect you'd ...
by MadRhino
Mar 31 2021 5:54pm
Forum: EBike General Discussion
Topic: Can you correct IGH chainline offset issues by dishing wheels differently?
Replies: 5
Views: 298

Re: Can you correct IGH chainline offset issues by dishing wheels differently?

This is only possible if the frame dropout width is wider than the hub. Then you can place the hub at the extreme drive side, space the other side with washers and dish the wheel to center it.
by MadRhino
Mar 31 2021 5:32pm
Forum: EBike General Discussion
Topic: 27.5” front 26” rear - Wheelbuilding
Replies: 75
Views: 1582

Re: 27.5” front 26” rear - Wheelbuilding

The simulator is not giving reality numbers in that particular case. In the mountain practical usage, the larger wheel won’t give better top speed unless you feed the motor much higher power. Using the same controller and battery, the larger wheel is likely to be a tad slower top speed in mountain t...
by MadRhino
Mar 31 2021 5:22pm
Forum: EBike General Discussion
Topic: First build and battery seems to die too quick.
Replies: 43
Views: 1178

Re: First build and battery seems to die too quick.

Bikes are not like cars. There is a very limited space and size available to build a good bike . That is why high density battery chemistries are normally preferred. Horses for courses .... It depends on what one wants in an E-Bike. I note that one of the bikes in you signature is capable of 50MPH ...
by MadRhino
Mar 31 2021 3:17pm
Forum: EBike General Discussion
Topic: 27.5” front 26” rear - Wheelbuilding
Replies: 75
Views: 1582

Re: 27.5” front 26” rear - Wheelbuilding

LARGER wheel diameter especially ...Well also helps a little with the top speed Not really. I mean, when the fastest top speed is the priority, the larger wheel won’t do it because of the higher leverage that requires more power and makes lower efficiency. When you want to exploit the fastest possi...
by MadRhino
Mar 31 2021 10:58am
Forum: EBike General Discussion
Topic: First build and battery seems to die too quick.
Replies: 43
Views: 1178

Re: First build and battery seems to die too quick.

Yep. So far battery technology had not succeeded to combine long life with high density. Long life batteries are heavier and bigger, while very high energy density batteries can be worn out very quickly. That is a compromise that one need to make, wether building priority is performance or durabilit...
by MadRhino
Mar 31 2021 10:18am
Forum: EBike General Discussion
Topic: 27.5” front 26” rear - Wheelbuilding
Replies: 75
Views: 1582

Re: 27.5” front 26” rear - Wheelbuilding

I'm running a MXUS 3KW TURBO 3t on my bike and love it, there is quite a difference in top end between the different winding variants of the MXUS. I'm running 24" on SAS halo rim and the acceleration is phenomenal. Wider rim on the back vs the front but both 24 inch. Smaller the better rim imo...
by MadRhino
Mar 30 2021 5:20pm
Forum: EBike General Discussion
Topic: Where to find brushed hub motors nowadays?
Replies: 12
Views: 393

Re: Where to find brushed hub motors nowadays?

Brushless electric motors are running cooler, and silent. They can be fed much more power than their rated spec. There is a large variety, cheap and easy to get. I can't see why one would want to go back to brushed motors for building a vehicle, other than the need for very large motors that would h...
by MadRhino
Mar 30 2021 5:09pm
Forum: EBike General Discussion
Topic: 27.5” front 26” rear - Wheelbuilding
Replies: 75
Views: 1582

Re: 27.5” front 26” rear wheel

I use brass or alu washers on the motor flange, stainless in the rim. My favorite spoke prep is double boiled linseed oil, the one that is sold for wood finishing. Blue locktite or other mild thread prep are doing good but much more expansive.
by MadRhino
Mar 30 2021 11:50am
Forum: EBike General Discussion
Topic: Where to find brushed hub motors nowadays?
Replies: 12
Views: 393

Re: Where to find brushed hub motors nowadays?

High speed with plastic kid’s cars is not a good idea IMO, but as long as this choice is about your own skin and bones, I have nothing against. :mrgreen:
by MadRhino
Mar 30 2021 8:42am
Forum: EBike General Discussion
Topic: 27.5” front 26” rear - Wheelbuilding
Replies: 75
Views: 1582

Re: 27.5” front 26” rear wheel

... Now with alternating “in and out” it seems that you wouldn’t be able to get the tension ratio as close, is that correct? It doesn’t change a thing for spoke tension. The purpose of alternate lacing is to limit the spokes rubbing, or even bending at the cross. Yet, with hub motor flanges that ar...
by MadRhino
Mar 29 2021 3:20pm
Forum: EBike General Discussion
Topic: 27.5” front 26” rear - Wheelbuilding
Replies: 75
Views: 1582

Re: 27.5” front 26” rear wheel

When possible we lace single cross alternate motorcycle pattern. One spoke out, the next inside of the flange and crossing under the previous. That is best and most common, but there are some good reasons to lace different: dishing, rim width, spoke J-bend angle...