If you're looking at buying an e-bike conversion kit (like the YIYIBYUS 20 inch rear hub conversion kit) for a 20-inch folding bicycle or compact commuter, and you've considered upgrading to electric for a while now, this affordable option from amazon is a great way to start. Most kits available today cater specifically to 26 inch and 700c wheel sizes. therefore, seeing a kit built around the needs of those using 20-inch wheels is a welcome surprise. Additionally, due to the cost of this kit being lower compared to many other large brands on the market, you'll be able to use some of that extra money towards purchasing a better-quality battery. For more information regarding how these types of conversions assemble, we recommend taking a look at our blog post containing a variety of e-bike conversion walk-through tutorials.
Specs and Build Quality
The foundation of this kit is the 48V 1000 w brushless toothless rear hub motor. The "toothless" part of this description refers to the fact that this motor utilizes a direct drive design (gearless), versus a geared planetary style used in many lighter kits. While direct-drive motors may offer slightly less torque off the starting line compared to geared motors, they are generally quieter, they tend to dissipate heat during prolonged climbing periods and since they contain fewer components, they are more durable. For a closer look at how direct-drive hubs differ from geared designs, ebikes.ca has a clear primer on the trade-off. Therefore, if you anticipate riding your bike daily for years to come, the increased durability afforded by a toothless motor is likely worth the additional weight.
In terms of overall performance, this kit's motor is capable of reaching speeds of approximately 31 mph (50 km/h). This should be sufficient for most riders utilizing 20-inch rubber on their small-wheel commuters. The kit operates within a 48-volt electrical system. The controller powering the motor is rated at 130 amps, which provides considerable latitude for the motor during prolonged applications of force. Overall, this product was designed with compatibility with 20-inch wheels in mind. Consequently, it includes a pre-laced rim and is easily installed. Also included in the purchase price is a 5-magnetic-point PAS sensor allowing for smooth operation of the pedal-assist feature, a power cutoff brake lever for safe disengagement of the motor while descending, and a thumb throttle for scenarios requiring maximum acceleration without having to utilize the pedals. Lastly, an integrated sw-810 led display displays your speed, battery charge, and assist levels. The display itself is relatively compact and does not clutter the bars.
Installation and Compatibility
As previously mentioned, this is a rear-hub conversion kit intended to replace the rear wheel of your bike. As such, installation simply requires removal of the original rear wheel followed by replacement with this YIYIBYUS model. The kit is compatible with forks having a rear drop-out spacing of 135 mm. In practical terms, this means that nearly all modern bicycles fall within this range and will not present any issues with regards to fitment. However, please verify that your bicycle falls within this range prior to placing an order. Also, compatibility-wise, the kit is compatible with either v-brakes or disc brakes provided your existing caliper or pad configuration aligns properly with the rim and/or rotor mounting area upon completion of assembly. There is no requirement to swap out your braking configuration. however, it is recommended that you ensure proper alignment prior to riding.
A notable caveat exists in relation to this product. Specifically, the kit does not include tires. You receive the motor, wheel, controller, display, throttle, brake lever, and sensors. however, you will need to provide your own 20-inch tire and tube to complete the assembly prior to completing your first ride. Although this type of limitation is common in the marketplace, it does necessitate planning accordingly. Once you begin assembling the wiring connections for your kit (i.e., connecting the phase wires and Hall wires), pay close attention to ensuring each color corresponds. Failure to match them accurately may result in reduced or erratic motor performance and/or failure to engage. Once you ensure the correct connection orientation, all of the wiring should function flawlessly.
What Amazon Reviewers Are Saying
Although this product remains relatively new to amazon with only two reviews currently posted resulting in an average buyer rating of 5.0 stars, the initial response from buyers has been encouraging. Buyer oleg shpungin stated that his motor functions well and ran smoothly. however, he did indicate he had anticipated receiving a 27-inch wheel set instead of the 20-inch version. To overcome this discrepancy, he chose to install a smaller tire on his front wheel and a larger tire on his rear wheel, confirming that all components functioned properly. Mr. Shpungin's comments serve as a valuable reminder to carefully examine the specifications listed in your product listing. The kit described above is exclusively intended for use with a 20-inch wheel set and will not perform optimally if installed on larger diameter wheels.
Who Is This For?
This particular conversion kit would be ideal for anyone owning a 20-inch wheel bicycle including those utilizing a folding bicycle or compact commuter. In addition, this kit represents an excellent entry-level option for budget-conscious builders seeking to transition their bicycle into an electric-powered vehicle without sacrificing their financial stability. Since this is a direct-drive gearless motor design, it offers the benefits of minimal maintenance requirements and extremely quiet operation. If you possess a larger wheel bicycle (such as a 26-inch or 700c wheel bicycle), then this kit would not be suitable for your application. Alternatively, you could reference our article on e-bike conversion kits covering multiple wheel diameters to determine which best meets your requirements.
Faqs
Does This Kit Include Tires?
No. The kit will ship with the motor, wheel, controller, display, throttle, brake lever and sensors but tires will not be included with the purchase. You will need to purchase your own 20-inch tire and tube separately before you can complete your first ride and have it operational.
What Kind of Battery Do I Need?
You will need a 48V battery to supply power to this 1000W motor. Select a battery providing adequate continuous output amperage to allow for satisfactory operation of the controller. Ensure the connectors on the battery correspond to those specified in your kit and connect them appropriately during the wiring process.
Will It Fit My Rear Fork?
The kit has been designed with a rear fork opening dimension of 135mm in mind. Verify that your bike's drop-out spacing is equal to this measurement prior to ordering. If your bike has a fork spacing greater than or less than 135mm you will need to obtain adapters or select a different kit based on your frame configuration.
Can I Retain My Existing Brakes?
Yes. The kit supports both v-brake configurations and disc-brake configurations. Provided your brake caliper or pad configuration is aligned properly with respect to the rim or rotor mounting area after completing assembly. you can maintain your current braking configuration.
How Fast Will It Go?
Based on manufacturer specifications this motor will operate continuously at speeds exceeding approximately 31 miles per hour (50 kilometers per hour) assuming adequate voltage delivery via your chosen battery pack. Actual operating speed will depend on several factors including rider weight, gear ratio selection and actual energy available from your selected battery pack.
You can check the current price of the YIYIBYUS 20 inch conversion kit on Amazon before you commit to a build.