ELECTRIC BICYCLE CONVERSION KITS
There are three types of kits available to convert your standard bicycle into an electric bike. They consist of an electric motor, battery, controller, display, throttle (in some units), and sensors:
Front Hub (Front Wheel) Ebike Kits
The front hub ebike kit is the simplest and the easiest way to convert your normal bike into an electric one. In this type of bike conversion, all you have to do is replace the front wheel with the motorized wheel, and the rest of the bike remains exactly the same as before.
Most of the time a front wheel conversion kit features a front wheel with a hub motor, a battery, speed controller, electric brake handles to cut off any power while braking, an LCD display panel, and throttle which is either a twist throttle or a thumb throttle. Also with front hub motors you may or may not get a pedal assist sensor, so you do have to look out for this feature.
Rear Hub (Rear Wheel) Ebike Kits
A rear hub ebike kit is considered a bit better than the front wheel conversion kit because it provides you with more control and traction. Also, almost all the manufacturers that are building electric bikes feature a rear hub motor unless it's a mountain bike.
Rear wheel electric conversion kit features a rear wheel with the hub motor that goes largely unnoticed since it looks much like an oversized traditional bike hub. These kits include a battery, speed controller, electric brakes, a digital display panel, throttle, and pedal assist.
Mid Drive (Pedal Crankset) Ebike Kits
In mid-drive electric bikes, the motor is integrated with the bottom bracket and pedal crankset that places the motor at the center of the bike and evenly distributes the weight of the motor. That's the reason why mid-drive motors are considered the best option for any type of off-roading or mountain biking, where you need your bike to be balanced.
Though mid-drive units are somewhat more expensive than hub motors, most people prefer mid-drive kits. Since the motor is directly connected to the crank drive, as soon as you start pedaling the motor drives the crank arms, which takes better advantage of the range of gears.