Search found 5007 matches

by MadRhino
Apr 23, 2018 10:46 pm
Forum: E-Bike General Discussion
Topic: Upgrading to disc brakes. Buy disc brake compatible wheel, or entire bike to pull wheel from?
Replies: 7
Views: 85

Re: Upgrading to disc brakes. Buy disc brake compatible wheel, or entire bike to pull wheel from?

Well, even the cheap BB5 disc brake will do better in the snow than a rim brake with any kind of pads. It will also do better when you have a less than perfect rim or wheel trueing. A big disc brake will do better in any conditions. If you can have a disc wheel for cheap, it is easy to try by yourse...
by MadRhino
Apr 23, 2018 10:05 pm
Forum: E-Bike General Discussion
Topic: mission impossible for me -.-"
Replies: 2
Views: 78

Re: mission impossible for me -.-"

The easy way is building with a geared hub, because it is small enough to lace easily in a 20’’ wheel. Not sure the top speed you can achieve though. Best place to find out, and have a good price is em3ev.com. Don’t buy before discussion, for they will need to know your top speed expectation. Many D...
by MadRhino
Apr 23, 2018 8:38 am
Forum: E-Bike General Discussion
Topic: Upgrading to disc brakes. Buy disc brake compatible wheel, or entire bike to pull wheel from?
Replies: 7
Views: 85

Re: Upgrading to disc brakes. Buy disc brake compatible wheel, or entire bike to pull wheel from?

Since your front has disc brake mounts, you only need a disc compatible hub in your front wheel, or another front wheel that has one. A used MTB wheel that is disc compatible can be found cheap. The rear is not important. You will be fine with best brake on the front. On snow and ice, you might cons...
by MadRhino
Apr 22, 2018 11:31 pm
Forum: E-Bike General Discussion
Topic: Building a solid rim for my QS205
Replies: 4
Views: 67

Re: Building a solid rim for my QS205

I believe this motor is available 14 inch cast wheel for 360$ at QS motor factory. They also offer smaller and bigger motors in cast wheels, 12 inch to 16 inch.

Might be simpler to just sell yours and buy one in a cast wheel.
by MadRhino
Apr 22, 2018 1:59 am
Forum: E-Bike General Discussion
Topic: 3.9C cell with 28mΩ resistance?
Replies: 6
Views: 168

Re: 3.9C cell with 28mΩ resistance?

It's a DC cell IR tester. Both tested brand new, same temp, same state of charge. Charged many from different batches (all new) and all have the same specs. Can it be that a 4C cell has almost 4 times higher IR than 8C? Bump... You will know when you pull 4C continuous off them. My guess is they wi...
by MadRhino
Apr 22, 2018 1:54 am
Forum: E-Bike General Discussion
Topic: E bike Gearing Why Bother
Replies: 15
Views: 294

Re: E bike Gearing Why Bother

I build single, the ratio that makes the bike comfortable to ride unpowered. When powered, crank work is useless because it couldn’t add any significant power or speed.
by MadRhino
Apr 20, 2018 10:39 pm
Forum: E-Bike General Discussion
Topic: The end of BionX?
Replies: 116
Views: 8764

Re: The end of BionX?

I guess GM was hoping for Bionix proprietary systems expertise, so that no one but themselves could fix their cars or supply replacement parts. :mrgreen: My last car was a Buick Century. It’s been rotting for so long that a 30 ft tree with an 8 inch trunk had grown through. I still have a running ´6...
by MadRhino
Apr 20, 2018 10:15 pm
Forum: E-Bike General Discussion
Topic: Who here on E.S. uses an ignition key?
Replies: 2
Views: 84

Re: Who here on E.S. uses an ignition key?

My disc lock has a key. I find it’s enough.

My controllers switchin circuits are wired to a toggle switch on the handlebar.

Got to leave a chance to a thief, to experiment either a back flip or a face plant. :twisted:
by MadRhino
Apr 20, 2018 10:12 pm
Forum: E-Bike General Discussion
Topic: Whatever happened to Lyen?
Replies: 3
Views: 130

Re: Whatever happened to Lyen?

Lyen is still active as far as I know. See his web page stock list at lyen.com

I still use some heavily upgraded 18fet square wave controllers with the cromotor and the X5404. They are not cogging, and the X54 is very silent.

The QS motor V3 does not like square wave. It does fry them.
by MadRhino
Apr 20, 2018 9:57 pm
Forum: E-Bike General Discussion
Topic: DC-DC converter from 48V to 6V for E-bike light?
Replies: 12
Views: 174

Re: DC-DC converter from 48V to 6V for E-bike light?

If you use 4 automotive 12v lights on your bike, you can wire them in a series, thus needing no DC-DC converter.

You can also use 6: 2 small red on the rear, 2 low beam and 2 hi beam on the front, with a switching circuit to choose the hi or low.
by MadRhino
Apr 20, 2018 6:52 pm
Forum: E-Bike General Discussion
Topic: Sparking when connecting battery
Replies: 4
Views: 103

Re: Sparking when connecting battery

You don’t know what sparks are, until you vapourize a 75A Anderson power pole shorting 4 bricks of hi C rate lipo, or explode a 200A controller in your living room. :twisted: Then avoiding the capacitors inrush sparks, only requires connecting first with a very small wire for one second. I prefer li...
by MadRhino
Apr 20, 2018 1:51 am
Forum: E-Bike General Discussion
Topic: Is REGEN, really worth it ?
Replies: 73
Views: 1997

Re: Is REGEN, really worth it ?

Low power and speed, doesn’t make you feel like you need regen anyway. Accepting the extra weight of a dd hub, is then more about reliability than regen ability. Riding a fast bike does make it interesting, to improve braking and/or efficiency. Those who are riding light weight performance, and will...
by MadRhino
Apr 20, 2018 1:01 am
Forum: E-Bike General Discussion
Topic: How do I choose a motor controller
Replies: 4
Views: 390

Re: How do I choose a motor controller

It would be too easy, if we could just list all the specs and features that we want, and order a controller to meet them. When you don’t have the money or qualifications to build one yourself, you have to make compromises and choose one that is readily available. So, everything is about priorities, ...
by MadRhino
Apr 19, 2018 6:35 pm
Forum: E-Bike General Discussion
Topic: Clearance front motor hub and caliper
Replies: 9
Views: 153

Re: Clearance front motor hub and caliper

One solution does fit without the need of any mod: Find a Magura Gustav M front brake.

Another solution is to use a large rotor. A 9 inch or 225 mm disc, and the matching caliper mounting bracket, would space most calipers out of motor rubbing range.
by MadRhino
Apr 18, 2018 6:11 pm
Forum: E-Bike General Discussion
Topic: Looking for people that own E-bikes
Replies: 25
Views: 473

Re: Looking for people that own E-bikes

Ebike cost can be very cheap. We have members on ES who had built their ebike entirely from recycling. They can also be expansive, many of us are riding ebikes that are more ultra light weight motorcycles than bicycles. Nevertheless, the ebike is the cheapest mean of transportation that there is. No...
by MadRhino
Apr 17, 2018 3:53 am
Forum: E-Bike Technical
Topic: freewheel spacing/shifter questions
Replies: 6
Views: 157

Re: freewheel spacing/shifter questions

You could just fit a washer on the axle shoulder to spread the dropout a little. The chain won’t rub anymore and you can ride with your actual freewheel. The washer can be filed to axle shape from a 10mm washer, or you can use a C washer. Or, You could use a 5 spd freewheel, for 5 speed is enough wi...
by MadRhino
Apr 16, 2018 11:58 pm
Forum: E-Bike Technical
Topic: Which mountain bikes are suitable for electrification?
Replies: 5
Views: 162

Re: Which mountain bikes are suitable for electrification?

Your question does miss an essential factor: performance.

Recommendation of a frame, does require to know how much power you’re gonna build on it, and how fast you plan to ride.
by MadRhino
Apr 16, 2018 11:49 pm
Forum: E-Bike Technical
Topic: The ultimate torque arm (For <2kW and standard axles)?
Replies: 103
Views: 1551

Re: The ultimate torque arm (For <2kW and standard axles)?

...No matter how powerful the motor is, it can't transmit more torque than it can stick to the ground. Well, torque does kick, even on a wheel that doesn’t touch the ground. When I give it some throttle whilst in a jump, my motor does lift the front of my bike. If I give too much, it can back flip ...
by MadRhino
Apr 16, 2018 11:59 am
Forum: E-Bike General Discussion
Topic: Battery series wiring
Replies: 19
Views: 278

Re: Battery series wiring

Building a battery with cells that are not all the same capacity, C rate and impedance, it will get out of balance every discharge cycle. Its limit will be that of the weakest link, and proper balance charging will take a long time, every time. If you don’t fit a BMS to them, some of the cells are l...
by MadRhino
Apr 16, 2018 6:09 am
Forum: E-Bike General Discussion
Topic: 3.9C cell with 28mΩ resistance?
Replies: 6
Views: 168

Re: 3.9C cell with 28mΩ resistance?

The state of charge and temperature does affect impedance of a cell. Those parameters should be measured equal, to compare 2 cells. Then, both impedance readings that you have measured are within the manufacturers spec Your Samsung cell impedance should be 7 to 16 m/ohm, 28 m/ohm after trip If my me...
by MadRhino
Apr 16, 2018 12:51 am
Forum: E-Bike General Discussion
Topic: Battery series wiring
Replies: 19
Views: 278

Re: Battery series wiring

I don’t know why, and I may be wrong but... I have a doubt that your cells are all the same. I mean, a good battery is made with cells that are all equal and equivalent for type, capacity, impedance, age... And each one tested 2 cycles at least, before assembly. Anyway, wish you success. The assembl...
by MadRhino
Apr 15, 2018 7:58 pm
Forum: E-Bike General Discussion
Topic: rewiring a bionx hub motor after removing the controller
Replies: 2
Views: 97

Re: rewiring a bionx hub motor after removing the controller

Considering that some more powerful motors can be purchased brand new for 100$, I am not sure that an old Bionix is worth the trouble, if it is not going to retain its only valuable quality of torque sensing system.
by MadRhino
Apr 15, 2018 3:39 pm
Forum: E-Bike General Discussion
Topic: Converting bike for Deliveroo coursier
Replies: 6
Views: 146

Re: Converting bike for Deliveroo coursier

Your link is a 500w geared motor. It is suitable for your requirements. 6 bikes? Maybe a few too many... Cutting and welding, making one cargo bike with one of them, maybe using parts of a second, is not so difficult to do yourself if they are steel. :wink: Many of us are into building purpose speci...
by MadRhino
Apr 15, 2018 12:00 pm
Forum: E-Bike General Discussion
Topic: Converting bike for Deliveroo coursier
Replies: 6
Views: 146

Re: Converting bike for Deliveroo coursier

What really works IMO, is the ugly bike. ... Or a cargo bike. Cargo bikes are not attracting thieves, and are easy to build, for battery placement especially. They are also ideal for delivery, leaving the rider free of backback or courrier bag. Building with integrated locks for both, bike and carg...