Most e-bike conversion kits go as far as 48 volts and stop there. The cofeco 72v 2000w rear Wheel conversion kit doubles the voltage and reflects that in nearly every specification that matters. Consider a 560 rpm motor, 60 nm of torque, and a 9-Speed rear Wheel in a 26-inch Wheel diameter. All bolted onto a standard bicycle frame. While you've probably seen this e-bike conversion kit on amazon and recognize that this is not a typical e-bike conversion kit for commuting, this product is designed to fly.
specifications
The Specs here really stand out. Most of the other 2000-watt e-bike kits are 48-volt systems. These systems deliver wattage via very high amp draws. Cofeco opted for 72 volts. Therefore, the motor delivers its maximum power at lower amps. This reduces the stress put on the controller, wiring, and battery connectors.
The items included in the package:
- motor: brushless and toothless (slotless) hub motor, rated for 72 volts and 2000 watts.
- Speed rating: 560 rpm (no-load).
- torque: 60 nm. Plenty for steep hills and rapid acceleration, even though this is a hub motor at this power level.
- Wheel size: 26 inch rim made of high-quality aluminum. The spokes are arranged for the torque load.
- gearing: 9-Speed rear cassette. Your mechanical shifting range remains intact as opposed to using a single Speed.
- display: simple to read, yet functional LCD display showing Speed, miles traveled, battery voltage, and assist level. Nothing fancy here.
- controller: sine wave controller = quieter operation. Square wave controllers produce more audible noise and generate harsher magnetic fields than sine wave controllers.
We would also like to take special consideration of the toothless motor design. Most hub motors utilize a slotted stator with iron teeth placed between each winding. Each time you turn the Wheel by hand, you may experience magnetic "cogging" from these iron teeth. The cofeco motor is a slotless motor. therefore, the windings are encased in epoxy within a smooth bore.
Performance
In terms of Performance, 72 volts is a huge difference maker from hub motors. In general, when comparing a 48 volt system to a 72 volt system at the same wattage output (in this case 2000 watts), the lower amp draw of the 72v system produces much less heat in the motor windings, reduces the stress on the controller's FETs, and greatly reduces voltage sag due to the battery under load.
As a result, this system will feel stronger at virtually every throttle position. Since the slotless motor does not exhibit startup cogging similar to many other hub motors, this system will provide you with extremely smooth, linear acceleration from a dead stop. At Speed, the 60Nm of torque will rapidly propel you upward.
On flat ground with a reasonably sized battery installed on the bike, this kit will easily cruise comfortably over standard ebike Speed limits. That is basically why we chose this 72v build.
Hub motor Hill climbing basics
When you climb steep hills on an electric bike equipped with a hub motor, it boils down to how well you manage heat. Both the rotating components of the hub motor along with all of the copper windings of the motor reside in close proximity to each other. Due to this arrangement, they do not benefit from gearing that allows them to multiply torque like a mid-drive can. As soon as you begin climbing a steep Hill, your motor begins drawing more current than usual, thus producing heat.
While slotless designs help improve upon cooling characteristics compared to traditional slotted designs at the same power ratings since they have reduced magnetic resistance in the air gap (meaning that more of the electrical energy is converted directly into motion rather than being lost as heat), extreme steepness can cause prolonged heat buildup.
Therefore, if you plan to spend considerable amounts of time traveling uphill steeply in your route, you should be judicious in managing your motor's workload.
nine Speed gearing
Many kits marketed as 2000w come shipped as single Speed units or with inexpensive freehub mechanisms. To add to this kit's appeal, cofeco provided a genuine nine Speed rear cassette. This means that prior to installing this kit on your bike, you already possess a suitable mechanical shifting range for cruising when you wish to contribute to your journey.
You can opt for smaller cogs on the front chain ring and still retain sufficient top-end to accelerate and maintain pace when you desire.
LCD display
Amazon reviewers' feedback
Although it appears that the review community for this kit is relatively new on amazon, a fairly distinct image of user sentiment is beginning to emerge.
why users like
Riders who switched from a 48-volt kit report an appreciable increase in top-end Speed and initial acceleration. Positive comments regarding the smooth startup provided by the slotless design have been noted. Additionally several reviewers have commented favorably on the fact that this kit provides accurate tracking of true circle measurements for the Wheel. this is often an issue that arises on less expensive hub kits where the spokes tend to lose tightness after the first ride. Aluminum rims were reported to weigh less than steel rims found on comparable kits.
complaints
Several reviewers reported that the Installation process requires fewer-than-average instructions. A simple illustration is supplied as part of the instruction manual but little else is. Therefore, if you have never previously completed an e-bike conversion kit project prior to completing this one, please consider viewing some instructional videos prior to commencing work.
Additionally several reviewers indicated that they felt that the LCD display was less impressive than displays utilized on more expensive e-bikes. The display does contain the essential information needed for riding including Speed, total miles ridden (odometer), trip distance (trip meter), battery voltage, and assistance mode. However, the display itself is monochrome and features a small backlit display area. Furthermore, reviewers reported that they thought that the freewheel mechanism produced excessive noise while operating.
Installation feedback
Nearly all reviewers stated that the Installation required approximately an entire afternoon utilizing basic hand tools. Tools such as wrenches (combination wrench sets), torque arms, and cable ties will be necessary for connecting cables properly throughout your bike. The kit consists of: Wheel assembly/cassette unit. controller. LCD display. throttle. wire harness. however you will require: battery. bike. and patience to route all cables appropriately.
Please verify whether your bike frame contains horizontal or semi-horizontal dropouts or whether you will need to purchase additional hardware (torque arm kit) to allow for vertical dropouts.
who should buy this kit
This kit is intended for Riders seeking increased Speed. Honestly.
If you are constructing an e-bike for commuting purposes at speeds of twenty mph on bike trails, then this kit has more capability than you'll ever need. Conversely, if you're interested in constructing an e-bike capable of keeping pace with traffic on forty-five mph highways, this kit is precisely what you want.
Performance-oriented Riders/Speed enthusiasts.
These specifications speak volumes about the ideal purchaser for this item: 72 volts & 560 rpm motor rating.
Pair this kit with a high-discharge seventy-two volt battery and optimize your controller settings and you'll have an e-bike that competes with moped/scooter traffic on highways.
The slotless motor produces exceptionally smooth low-Speed throttle input, making it perfect for riding in neighborhoods or cruising at higher speeds.
e-bike enthusiasts searching for a complete 2000-w setup:
There are numerous kits available that market themselves as "2000 w," however most are simply a hundred percent peak-rated controllers paired with two thousand watt motors. The limitation of these controllers restricts how much power you can actually extract from your motor. Prior to purchasing any kit, please check the actual controller rating.
urban commuters who frequently travel on highways:
If your daily commute entails segments of highway with traffic flowing at thirty-five to forty-five mph, then you'd likely find yourself getting passed by other vehicles riding normal e-bikes powered by 48-volt 1000-w kits. This kit enables you to keep pace with highway traffic speeds and then throttle back for bike lane use and/or neighborhood riding.
who shouldn't buy this kit:
Quiet/easy-to-use e-bikes for recreational use: the noises generated by hub motors under load plus freewheeling noise while decelerating may deter some potential buyers. Further, due to requirements associated with 72v batteries (higher-cost than comparable fifty-eight v batteries), prospective purchasers should be prepared to pay more money for a seventy-two volt battery possessing adequate capacity (a minimum of thirty amp-hours) to support two thousand watts continuously.
Check the price currently listed on amazon to determine whether this kit is within your budget and meets your desired application parameters.
frequent questions
how large of a battery do i need for this kit?
To operate this kit successfully, you need a sixty-nine volt battery rated for a continuous discharge rate greater than or equal to thirty ampere-hours (ah). Two thousand watts at seventy-two volts equates to roughly twenty-eight amperes (amp). therefore thirty amp-hours offers ample margin for safety.
For acceptable range (although less than what larger-capacity batteries would provide), fifteen ah seventy-two volt batteries or thirteen ah seventy-two volt batteries may be used for shorter trips.
Do not attempt to operate this kit using a fifty-eight volt battery -- either it will shut off prematurely or operate below optimal efficiency levels.
Visit our guide to selecting compatible batteries for conversion kits for various options that meet these criteria.
is assembling this kit challenging for individuals without previous experience assembling conversion kits?
Reasonable challenge level exists for assembling conversion kits in comparison to mid-drives because, with conversions kits for hubs mounted rear wheels. you don't mess with the bottom-bracket or drivetrain past installing the cassette.
Swap-out-rear-Wheel mounting controller attaching wiring attaching throttle attaching display = easiest part is routing all wiring so it doesn't catch onto spokes or chain.
Plan on spending an entire afternoon on your first conversion kit Installation.
does this kit offer improved acceleration from stopped conditions compared to others?
Yes and no:
At ninety-six% efficiency (compared to most motors which are ~80% efficient), six-hundred-fifty revolutions per minute (rpm) at no-load translates into significantly higher theoretical maximum speeds than equivalent fifty-four-volt motors spinning at four-hundred rpm.
However,
Initial acceleration from stopped conditions depends mostly upon the quality of current delivery by your controller and amount of torque delivered by your motor.
The sixty-nm torque value represents excellent torque values for a hub motor at this horsepower rating.
Furthermore, smooth low-Speed response is provided by slotless design.
Thus,
Both good acceleration and high-top-end exist.
That combo rarely occurs at affordable prices.
can this kit be installed on my existing bike?
It works with any bike having twenty-six inch tires and conventional one-thirty-five millimeter rear drop-outs (135 mm).
Most mountain bicycles / hybrid bicycles / older road bicycles feature one thirty-five millimeter drop-out spacing.
If your bike features one-thirty-millimeter road spacing or thru-axles featuring one forty-two millimeter spacing, adapters / another conversion kit will be required.
Verify that your drop-outs are horizontal / semi-horizontal before ordering.