Tag Archives: e-bike conversion

A pair of pedals that ARE an electric bicycle conversion

Convert a Bike by adding a pair of pedals!

I just found out about this, and I think it’s a brilliant invention. Wish I’d thought of it. See the image below : a pair of pedals that ARE an electric bike. The pedals turn the bike into an electric bike. but how?

pedal e-bike conversion
these pedals convert a bike

Have you ever had a pedal jam and not rotate? It’s annoying. As the crank goes around the stuck pedal rotates under your foot and makes it hard to pedal. These pedals have the opposite effect. The motor inside makes them rotate with respect to the crank but your foot keeps them horizontal, and that forces the crank to rotate.
Obviously there are limitations in getting motor plus battery into something as small as a pedal. If you have seen my post on the Vivax Assist motor that has 200 Watt motor within a seat tube you know that getting a motor small enough is not such a problem, but getting a battery small enough, and useful enough is.
Therefore these will not replace a 250 Watt conversion nor go as far as a typical 36V 10AH battery but will give some “help”…an extra one third of your power and for 15km they say.
The main benefit of these pedals is that they can easily be added to a bike, any bike, and taken off and put on another bike, and require no battery or wiring. This is similar in effect (but less clever or powerful) to the all-in-one wheel conversions such as FlyKly wheel that I mention in another post here.
Another advantage is that the pedals are in effect a “central motor” because they work on the chain and through the bike’s gears as a central motor does.
The on/off happens by flipping the pedals over. So they are alway on, or always off. There not being a throttle or PAS is a disadvantage.
Find out more about these at Britt technologies

E-Bike Conversion – the basics

Yes you can convert just about any ordinary bicycle into an electric bicycle.

In US about half of the e-bikes on the road were once an ordinary bicycle. (In europe less so, because they are less DIY there)

Many brands of electric bike were made as on ordinary bike frame and the electric bike factory added motor and the battery.

You need to think about where to put the motor and battery.

If you have any rear wheel gears other than the very ordinary screw on gears then you probably won’t want a rear hub motor.  There are not many rear hub motors that can keep your casssette gears ( if you have those) and they are more expensive. 

If you have rear sprung suspension then you can’t add a rack above the wheel to hold the battery.

Otherwise you can have the motor in front or rear wheel, or centrally near the pedals ( See E-Bike Motors – front, rear or mid) and the battery on a rear rack or attached to down tube, seat post or anywhere else it fits.

There some forums where enthusiastic devotees of DIY conversion describe (brag about) their conversions. For instance Endless Sphere

There are countless videos on YouTube about bike conversion. Just search those words and there are so many to choose from. If you need to you can get confidence from a few of those. But probably you won’t need to because converting your bike with a basic front or rear wheel conversion kit is quite easy.

There are many shops selling a basic conversion kit. There are also many on EBay. Many of those will not be in stock locally and will come from China. You can get a conversion kit direct from many sites in China yourself, but do make sure about what you order.

You will see a picture like this

electric bike conversion kit
electric bicycle conversion kit

These include a hub motor and a “controller” that connects to it and either or both a throttle and a pedal assist sensor. One or a pair of brake levers are usually included. They replace the brakes that you had and are added safety because they stop the motor when you brake. They are not essential but recommended for safety. If you have a brake and gear shift combined you can keep them but they won’t stop the motor. Increasingly an LCD screen showing speed, distance and more is included. 

Most of the conversion “kits” will include a battery. However most shops will sell the wheel and controls separately from the battery. The battery is the most expensive component of a conversion. In general any battery of appropriate voltage and capacity can be matched to the controller of the motor. You are likely to get a better total price if you shop for battery (and rack or attachment) separately.

I have conversion kits with front or rear hub motors, or bottom bracket replacement central motors here and various electric bike batteries and racks here (all at a good price)

This year 2014 “smart wheels” will start to be produced. These are all-in-one conversions and may be a suitable simple easy conversion for some. See Smart wheels – a simple easy conversion

Next posts : E-Bike Conversion – Front or Rear Hub

E-Bike Conversion – Central Motor