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19 votes
Accepted

Can I use an RC motor to make my bike electric?

Its designed to attach the prop of a model aircraft directly, i.e its designed to drive a fan that cools it. It has little (or none) weather protect, and would be destroyed on a bike in months. ...
mattnz's user avatar
  • 50.5k
15 votes

Bicycle weight limit (carrying capacity) increase

On a non-folding bike, I'd look at the wheels, and probably replace them with 36 spoke touring wheels and reasonably wide, tough tyres (e.g. 35mm). The tyres absorb some of the shock loads. However a ...
Chris H's user avatar
  • 59k
13 votes
Accepted

DIY system for charging battery packs from hub dynamo

Decathlon uses a third party part, that is available for sale if you want to fit it on your bike: Cycle2Charge The category name for this kind of products is "headset cap USB charger" or &...
Rеnаud's user avatar
  • 20.4k
10 votes
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What is this ... electrical bike's setup? Is there a particular brand or model name for this? how to replace its battery?

It looks to be an older Currie Electro Drive, they were originally made in 1996 i believe. I don't know much to anything else about them though other than that is one and they exist. Here is the ...
Nate W's user avatar
  • 9,262
9 votes
Accepted

Bicycle weight limit (carrying capacity) increase

tl;dr: if you want a sturdy folding ebike, you need to have a sturdy folding bike. Even if the bicycle statically/dinamically can stand more than the declared weight (at your own risk), the (expected)...
EarlGrey's user avatar
  • 3,583
8 votes

Can I use an RC motor to make my bike electric?

The important number is not power, but torque. The linked page doesn't say it, but that 2000W is probably achieved at a huge speed (thousands of rpm). To get enough torque to drive the bike (and to ...
Hobbes's user avatar
  • 180
6 votes
Accepted

Ebike brake lever cutoff switch / interrupt switch : How does it work?

In your current set up, the electric brake lever sensor will protect against the situation where you're emergency braking but forgot to release the throttle. The brake sensors override the throttle ...
Criggie's user avatar
  • 125k
6 votes

How much human-provided power is needed on an e-bike?

In order to ride at an average speed of 20 mph, especially when riding on the light setting you can't go at 20 mph on uphills. This means you need to go much faster than 20 mph on the flats. Let's say ...
juhist's user avatar
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5 votes
Accepted

What's the power supply for a Saris CycleOps PowerBeam Pro turbo trainer?

This Reddit thread has a response from Saris giving the exact specs: Good Morning, Thanks for reaching out to Saris about your trainer. Though we stopped making our PowerBeam trainers in 2016 and ...
DavidW's user avatar
  • 5,183
5 votes

DIY system for charging battery packs from hub dynamo

The "Forumslader" (German site) is a semi-commercial semi-DIY dynamo charger. Schematics for older versions are available. This very detailed article by Olaf Schultz, also in German, ...
Erlkoenig's user avatar
  • 1,913
4 votes

Can I charge an ebike from another ebike battery?

Here is a video I found which is very detailed and shows how to add a second battery to your bike: Video: How To Add 2nd Battery to the Fiido D2 Here's the link to the battery which was recommended ...
NoCo Rider's user avatar
  • 1,369
4 votes

Can I charge an ebike from another ebike battery?

Yes in theory but the gain is not practical. You’re better off swapping batteries than trying to jury rig something. Let’s do the calculations. You note that the AC charger puts out 36VDC at 2 ...
RoboKaren's user avatar
  • 29.2k
4 votes

Can I use an RC motor to make my bike electric?

This is a supplementary answer. You're concerned about your conversion screaming ebike. I'd like to challenge this premise. Some of the new geared hub motors are small enough to hide behind rear ...
RoboKaren's user avatar
  • 29.2k
4 votes

Can I use an RC motor to make my bike electric?

These RC motors are made to be used on much smaller and lighter objects than a bike+human combo. So even if it delivers 2k W, it will most likely just surge and either overheat, break its inner ...
mtdp's user avatar
  • 301
4 votes
Accepted

Do gear train cogs exist (for driving a cog from a motor)?

These cogs are very unlikely to exist. A proper gear-to-gear transmission uses an "involute" tooth profile, which is shaped so that the gears maintain a constant relative rate of rotation. A side ...
RLH's user avatar
  • 1,621
3 votes

Dual electric/pedal bikes to solve pedalling effort issues

Not sure if I understand your question correctly, but I take it you want to ride unassisted during training/recreational rides? I don’t have much experience with electric bicycles but as far as I’m ...
Michael's user avatar
  • 27.5k
3 votes

Can I use an RC motor to make my bike electric?

I did this. It is not impossible and very fun, some electronics skills required. Derate the motor: if the maker says "10Kw @ 100V" you know that the max admitted Amperes are 100. Cut that down to 40-...
Guest's user avatar
  • 31
3 votes

DIY system for charging battery packs from hub dynamo

Most Dynamos are 6V, 3W output, you would need to know the specs for yours. Amazon/Aliexpress etc have heaps of 6-24V input to USB output devices for a couple of dollars. You can also get a 0.9-5V ...
mattnz's user avatar
  • 50.5k
3 votes

Bicycle weight limit (carrying capacity) increase

My main concerns would be spokes in the short term; but wheels can easily be exchanged. The second and graver concern is the frame. When I was riding about 100km per week, including some cobblestone ...
Peter - Reinstate Monica's user avatar
2 votes

How much human-provided power is needed on an e-bike?

Cycling power is frequently measured is in watts. To know how much power the rider needs to contribute to a 20 mph speed over 50 miles you need to know: How much power is needed to sustain 20 miles ...
David D's user avatar
  • 21.4k
2 votes

How much human-provided power is needed on an e-bike?

Depends on how much the “light assist” setting actually assists. To ride 32km/h (20mph) on flat terrain with a road bike in road bike clothes you need about 170W to 210W. With a city-bike or mountain-...
Michael's user avatar
  • 27.5k
2 votes

Why did the manufacturer fit a usb port on my e-bike battery when it is not connected?

It doesn't fully answer the question but I've found a (replacement?) battery online that seems to be compatible to the Viking Gravity based on its product description: Compatible with ebike type ...
DoNuT's user avatar
  • 4,451
2 votes

Can I charge an ebike from another ebike battery?

My apologies if I have misunderstood the question, but connecting the output of a secondary battery to the charge input of the primary would not work "in the field" most, if not all such batteries ...
plinko84's user avatar
  • 223
2 votes

Can I charge an ebike from another ebike battery?

Hmmmm... IMO if you get a schematic drawing for the bike you should be able to purchase a 2nd battery and find a method to connect that battery in parallel to the original. Having a second battery ...
NoCo Rider's user avatar
  • 1,369
2 votes

Ebike brake lever cutoff switch / interrupt switch : How does it work?

It is just possible to use a Normally Closed (NC) Single Pole Double Pole (SPDT) relay to open/cut the motor current/voltage when the handbrake lever switch is applied (i.e., when the handbrake lever ...
ZL2ROB Robert's user avatar
2 votes
Accepted

"Right" way to store energy from 2 dynamo hubs

This is going to be difficult. I assume you have a tadpole or delta and you're trying to drive the dynamos off the paired wheels - and not the single (drive) wheel. Problem 1: Single-Sided Hubs The ...
RoboKaren's user avatar
  • 29.2k

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