Frequently asked questions about the CYC X1 PRO mid-drive motor system and our services.

About the X1 PRO

1. What are the specifications of the X1 PRO motor?

Important Motor Specs

Motor KV: 150KV

Maximum Rated Motor RPM: 14 000 RPM

Rated Motor Torque: 4.5N.m. with BAC855 & 7N.m. with BAC2000

Rated Motor Power: 3kW with BAC855 & 5kW with BAC2000

X1 PRO is a BLDC Motor

X1 PRO is a sensored BLDC motor which means that there is no carbon brush like in brushed motors. Thus, there is no physical wear and tear causing the motor to be much more durable than conventional motors. Generally, BLDC motors have much higher efficiency, and reduced noise levels compared to brushed motors. Brushed motors are older technology which is easier to overheat under high load at low RPM. Meanwhile, the BLDC motor used in X1 PRO is a completely redesigned BLDC motor which is using more advanced technology. With a built-in temperature sensor, it is very difficult to fry the motor, even at extreme loading of > 5kW.

X1 PRO is an In-Runner Motor

X1 PRO motor is an in-runner motor with the stator directly in contact with the air. The stator is potted with a highly heat conductive epoxy, which increases the heat conductivity by up to 50% to the exterior aluminium fins. Some have suggested to use ferrofluid within the air gap to improve the heat dissipation. This is not necessary to add as the stator is already dissipating heat very efficiently via the aluminium fins.


The X1 PRO is one of the most efficient BLDC motors in the e-bike market, with over 90% efficiency through the controller and motor. This is possible because the motor has 0.2mm lamination which reduces Eddy-current loss. The SPM rotor allows minimum magnetic flux loss which further increase the efficiency.

Maximum Torque

X1 PRO motor system has a two-stage reduction. 1:6 from the planetary gearbox and another 1:6 from the sprocket and chain driving the chainring at the crank. Combined, this results in a reduction ratio of 1:36. This means that the maximum 7N.m. supplied form the motor, results in 250N.m. of torque at the bicycle crank.

3. How do I install the X1 PRO?

Installation of X1 PRO only takes around 30 minutes after the first attempt. This short installation time allows you to easily convert from MTB to E-MTB.

The links below to provide you with downloadable user manual for you motor:

User Manual for CYC X1 PRO Gen 2

User Manual for CYC X1 PRO Gen 1

The links below will redirect you to video installation guides for the CYC X1 PRO:

Video installation guide for press-fit BB92

Video installation guide for CYC X1 PRO Gen 1

4. What bottom bracket option should I choose?

The X1 PRO kit support several bottom brackets, including the traditional BSA threaded bottom bracket, and press-fit bottom brackets.

The X1 PRO BSA threaded options fit bottom brackets ranging from 68mm to 120mm with extra spacers included in your kit should you need it. The pressfit options include BB92 versions as well as BB107 and BB109. BSA threaded and press-fit bottom brackets are the most common among mountain bikes. Below is a guide to help choose the correct option for your CYC Motor kit and how you check which bottom bracket you have.

If you already know what bottom bracket you have, refer to the chart below. If not, continue reading after the chart for guidance.

(click to enlarge)

What bottom bracket do I have?

There are two main types of bottom brackets

1. Traditional BSA threaded bottom brackets

These bottom brackets are assembled to the bike frame by threads. When these bottom brackets are removed from the bike frame, you can see that there are threads on both the bottom bracket, and the bike’s bottom bracket shell. The BSA threaded bottom brackets can be further separated into two types namely, the BSA threaded bottom bracket with external cups and the BSA threaded bottom bracket with a sealed cartridge.

a) BSA threaded bottom bracket with external cups:

This type of bottom bracket has two external cups one on each side of the bottom bracket. The external cups typically have bearings pressed inside the cup that face outward from the thread that is directly in contact with the bottom bracket.

The cups are typically threaded on to the bike by using a bottom bracket wrench as shown below.

b) BSA threaded bottom bracket with a sealed cartridge:

This type of bottom bracket has two parts to it. The first part is a spindle and a drive side cup assembled. The second part is a non-drive side cup alone. Both cups are threaded on the face in contact with the bikes bottom bracket. This type of bottom bracket needs to be removed using a different bottom bracket tool.

The bottom bracket diameter can be measured according to the image below. Here are the typical measures of the BSA bottom bracket:

The typical widths of the BSA threaded BB are 68mm (road bikes), 73mm (mountain bikes), 83mm, 100mm and 120mm. The 68mm to 83mm BB option will fit all the diameters in between with additional spacers included in the kit.

2. Press-fit bottom brackets

These bottom brackets, on the other hand, are pressed into the bike frame. It stays there by means of strong friction between the bottom bracket cups and the bike's bottom bracket. The easiest identification of the press-fit bottom bracket is that there are no threads inside the bike's bottom bracket, or on the bottom bracket cup.

Usually there are no clear installation marks for press-fit bottom brackets, as these kinds of bottom brackets require the press-fit tools to install and remove them.

Currently, we support BB92 press-fit bottom brackets with a width of up to 92mm as well as BB107 and BB109 press-fit bottom brackets with a width up to 109mm. The bottom bracket diameter of the BB92, BB107 and BB109 is 41mm. Based on the information above, you can determine whether you have a BSA threaded or press-fit bottom bracket and refer to the 1st chart for the right option in your kit.

5. What chainring option should I choose?

CYC Motor supplies 3 various chainring options as shown below and comes with either an aluminium chain guard (default) or carbon chain guard (if requested). When choosing your chainring, keep your desired ground clearance in mind. It is also important to note that the options will not affect the speed or torque of the motor, only the pedal feeling of the rider when the motor is switched off. Click here for more information.

The sprocket on all options has a 104mm BCD which means that you can switch to any standard chain sprocket or even belt pulley for Gates carbon belt system.

11/53T Option

The 53T 219H sprocket has an outer diameter of 136mm. It comes with an inner 32T bike chainring by default which is included in the kit.

11/63T Option

The 63T 219H sprocket has an outer diameter of 160mm. It comes with an inner 38T bike chainring by default which is included in the kit.

12/72T Option

The 72T 219H sprocket has an outer diameter of 184mm. It comes with an inner 42T bike chainring by default which is included in the kit.

The drawing below shows the same bike fitted with a 12/72 (top), 11/63 (middle), 11/53 (bottom) options respectively: Below, you will find links to life-size printables for your reference: Printing instructions 11/53T with 32T inner chainring option
11/63T with 38T inner chainring option
12/72T with 42T inner chainring option

6. What controller should I choose?

CYC Motor currently offers two types of controllers supplied by ASI Technologies for the X1 PRO, namely the BAC855 and BAC2000 controller.

Power Capabilities


- Rated power: 3kW

- Phase current: 80A (4.5N.m. or torque form the motor & 160N.m. at the crank)

- Battery Current: 50A continuous & 60A peak


- Rated power: 5.5kW

- Phase current: 200A (7N.m. or torque form the motor and 250N.m. at the crank)

- Battery Current: 80A continuous and 100A peak

Mounting the Controllers

The mounting bracket of BAC855 is included in the kit along with a bash guard. The BAC855 is integrated between the mounting bracket of X1 PRO, meaning that you would not need to mount the controller independently and is provided pre-assembled.

On the other hand, the BAC2000's dimensions are bigger and needs to be mounted independently to the frame. We have left a very adequate wiring length for the BAC2000 option to give you the maximum flexibility. Since all frames differ significantly in dimensions, you will need to determine your own way for mounting. However, we are able to provide you with a 3D printing step file upon request.

CYC Motor further supplies you with a mounting bracket for extra stability which is included in the kit.

Compatible Batteries

The ASI controllers support 36 to 72V batteries (nominal voltage). In order words, 10s to 20s lithium batteries (fully charged 20s equalling to 84V).

The BAC855 controller can handle 80A maximum phase current (4.5N.m. of torque form the motor and 160N.m. at the crank) and requires 50A continuous and 60A peak battery current to run at its maximum performance.

BAC855 voltages and expected power:

2000W with 36V batteries  2650W with 48V batteries  2800W with 52V batteries 3000W with 60V batteries  3200W with 72V batteries 

The BAC2000 controller can handle 200A maximum phase current (7N.m. or torque form the motor and 250N.m. at the crank) and requires 80A continuous and 100A peak battery current to run at its maximum performance.

BAC2000 voltages and expected power:

3500W with 36V batteries  4000W with 48V batteries  4500W with 52V batteries  5000W with 60V batteries  5500W with 72V batteries 

Compatible Displays

Both BAC855 and BAC2000 controllers can be paired with either a 500C or 750C APT display. The 500C APT display supports up to 52V nominal battery voltage, while the 750C APT display can handle everything up to 72V nominal battery voltage.

The controllers are also be highly configurable via the Gen 3 CYC Motor app (for iOS and Android devices) which is currently under construction and will be realeased soon.

Other Information

- CYC Motor uses high quality, waterproof Julet connectors throughout the setup.

- The controllers are FOC, and support field weakening which can help you gain even more RPM than with standard settings.

- The BAC controller options are now optimized to be used with cadence and torque sensing.

7. What are the pedal assist and throttle options?

Throttle Options

CYC Motor supplies three throttle options, namely the thumb throttle, half-twist throttle, and full throttle. All three options of the throttles have the same function and settings, you only need to choose according to your preference.

Pedal Assist System

The standard package of X1 PRO is already equipped with a torque sensing bottom bracket. The bottom bracket has a built-in torque sensor and a cadence sensor. Both signals will be taken into account by the controller to offer a very intuitive pedal assist experience. The pedal assist is very configurable, which means that you can configure it to a similar experience as a pre-built eMTB. As both sensors are built-in, you can also activate both or only one as the pedal assist signal source. This means that if you prefer only cadence based or torque based pedal assist, it is possible to set via the app. Most conversion motor systems only use a cadence sensor for the pedal assist. The torque sensor gives the X1 PRO kit the ultimate assist preference.

8. Power output, top speed, and batteries?

Power Output


The ASI BAC855 controller accepts batteries from 36-72V (nominal), which means that lithium-ion batteries of 10s to 20s all work well with the motor system. 72V (20s) batteries fully charged is around 84V.

The maximum battery voltage that the ASI controllers can accept, is 72V (20s) nominal. BAC855 has a battery current limit at 65A and can support up to 50A continuous.

With the BAC855, the expected power of the motor is:
2000W with 36V batteries
2650W with 48V batteries

2800W with 52V batteries

3000W with 60V batteries

3200W with 72V batteries


The ASI BAC2000 controller also accepts batteries from 36-72V (nominal), which means that lithium-ion batteries of 10s to 20s all work well with the motor system. 72V (20s) batteries fully charged is around 84V.

The maximum battery voltage that the ASI controllers can accept, is 72V (20s) nominal. The BAC2000 controller has a battery current limit of 120A and can support up to 100A continuous.

With the BAC2000, the expected power of the motor is:
3500W with 36V batteries

4000W with 48V batteries

4500W with 52V batteries

5000W with 60V batteries

5500W with 72V batteries

Keep in mind that the BAC2000 will try and consume the rated power set. When the power limit is set higher than the battery can provide, the BMS will often protect the battery by shutting off. Alternatively, the system will become reliant on the battery to limit the power input which strains the battery BMS. I.e. If you want 5kW, ensure that 100A peak can be supplied form the battery at 72V nominal. Even though it is equivalent to 7.2kW of battery power, you must account for voltage drop and efficiency losses. Therefore, we recommend 100A peak battery current to take full advantage of the BAC2000 controller.

Top Speed The voltage also affects the maximum speed that you can achieve. The motor Kv is 150, which means that the maximum RPM of the motor is equal to the motor Kv multiplied by the nominal voltage:

5500 RPM with 36V batteries

8000 RPM with 52V batteries

9000 RPM with 60V batteries

11000 RPM with 72V batteries

The top speed at the crank varies with the chainring options you choose. For example, if you choose 11/53T chainring option (with 32T bike chainring), the reduction ratio from motor to crank is 1:28.9. Therefore, the top speed at crank with this option is as follows:

190 RPM with 36V batteries

277 RPM with 52V batteries

311 RPM with 60V batteries

381 RPM with 72V batteries

If you choose 11/63T chainring options (with 38T bike chainring), the reduction ratio from motor to crank is 1:34.4. Therefore, the top speed at crank with this option is:

160 RPM with 36V batteries

233 RPM with 52V batteries

262 RPM with 60V batteries

320 RPM with 72V batteries

If you choose 12/72T chainring options (with 42T bike chainring), the reduction ratio from motor to crank is 1:36. Therefore, the top speed at crank with this option is:

153 RPM with 36V batteries

222 RPM with 52V batteries

250 RPM with 60V batteries

306 RPM with 72V batteries

To calculate the top speed you will achieve, please input your bike gear ratio and maximum RPM to the cadence in this link: https://www.bikecalc.com/

Range and efficiency

We summarized the following range for a 65kg rider for your reference:

Normal ride style - Run in PAS mode at around 500W (e.g. trail riding) : 10Wh/km.

Aggressive ride style - Run in Throttle and PAS mode at more than 1000W : 20Wh/km.

The motor and controller overall, has an efficiency of over 90%.

9. How can I clean and service my X1 PRO?

Let’s face it... your X1 PRO will never be as clean as the day you installed it. Whether you ride the MTB trails, city routes or just bashing in your backyard, your X1 PRO will get some (if not lots) of dirt. Checking the condition of your kit regularly will ensure that you get the most out of your ride without any technical difficulties out in the bush and of course, cleaning a motor system will be a bit more work than cleaning just the bike, but well worth the effort!

Before getting started, make sure you’ve disconnected all electrical supplies from the drive unit. This applies for general storage, transportation and when doing any maintenance or modification work on your bike and X1 PRO kit. DO NOT attempt to disassemble or modify the drive unit.


It’s advised to clean your bike before putting it away as dirt (especially mud) might harden the longer it’s left. Make sure you’ve unplugged the power supply but there’s no need to unplug any other wiring to wipe it down and we also don’t advise doing so. Get a damp cloth and simply wipe down the bashguard, motor exterior, chainring and chain guard. Do not use any soap-like liquid against the motor, clean water is all you’ll need. If there’s lots of dirt stuck in between the bashguard and controller, rather use a small brush, like a toothbrush, to get it out.

Even though the kit’s components are rain proof, refrain from soaking the cloth completely or submerging the motor or components in water as this could lead to irreversible water damage. Most importantly, make sure everything is dried nicely before attempting to power it back up.


There’s no specific time to self-service your kit. Although we do recommend having a good look at the overall condition of your kit before and after every ride. This is easy enough since all you need to do is check a few things:

  • Make sure there’s no grease running from the gearbox.
  • If anything went loose, like nuts or bolts, tighten it back up.
  • Make sure that all the wires are still in good condition and still plugged in nicely.
  • Check the chain for proper tension and lubrication. You can use standard chain cleaner and lubrication when needed.
  • Make sure there is no unusual noise when running the motor.

If there are any components that look like they’re wearing thin, be sure to contact us for a replacement before pushing your limits on your next ride.

Cleaning, self-servicing and maintaining your X1 RPO is the difference between having a smooth next ride or getting jammed in a random obstacle. If you notice anything unusual before, during or after your ride, don't hesitate to contact us:


We’re here to help.

2. Will the X1 PRO fit my frame?

The X1 PRO is uniquely designed to fit 95% of all existing frames and has been used in a lot of DIY builds as well. There are two main factors that will determine whether the X1 PRO fits your frame. Your bottom bracket type
CYC supplies a variety of bottom bracket options. Have a look at question 4 on this page to determine what bottom bracket you have, as well as to see which option suits your frame the best.

Available space
Every frame is designed differently and the X1 PRO can be mounted in various positions. To help you determine where to mount the X1 PRO, we have included life-size printables in the links below to help you out.

Printing instructions
X1 PRO with left-side mounting bracket
X1 PRO with right-side mounting bracket

Chainring Sizes
Printing instructions
11/53T with 32T inner chainring option
11/63T with 38T inner chainring option
12/72T with 42T inner chainring option

If you are still unsure, click here to send us your bike name and model for guidance.

About our services

1. Do you ship worldwide?

Yes! CYC Motor ships to all 4 corners of the globe straight from our website to your doorstep. You can order directly here.

We also have some dealers in UK, USA, Poland, Austria, South Korea and New Zealand. Check out our Dealers page to find a dealer near you.

2. Do you assist with kit options and recommendations?

Yes! We will assist you from the get-go. Whether you need some guidance on picking a frame or choosing a BB option, we'll be glad to help you every step of the way. Contact us for assistance.

3. Why should I choose a CYC conversion kit?

Why should your convert you normal bike into an e-bike? And why choose a CYC motor to do so? There are so many reasons why to convert your bike to a CYC powered e-bike idol. The real question is: Why not?! With the X1 PRO Gen 2 and the newly released X1 Stealth, there’s something for everyone. The power to break boundaries As most e-bikes have a power output of 1000W and 90N.m. of maximum rated torque, CYC provides you with kit options ranging from 1500W all the way up to 5000W and maximum rated torque ranging from 150N.m. to 250N.m. depending on your motor and controller options. CYC brings power to excite any e-bike enthusiast. You will have the ability to enjoy two sports with one machine! With full power settings, you can run the motor with a proper downhill frame just like an electric dirt bike, but with a much lighter weight and better handling. In fact, with the BAC2000 controller setup, you can run the X1 PRO at a similar power and torque level (>5kW) as some popular electric dirt bikes. Of course, you will need to choose a strong downhill frame if you want to run the motor at its maximum power. It is important to check if your bike and its components, can handle the power and torque. Think this is a bit much? No need to worry! There are two power presets in the CYC motors’ units. You can switch between Street Mode and Race Mode easily on the display. Street Mode is set up to perform similarly to the pre-built e-bikes which comply with legal standards. Please do check your local regulations in order to adjust the power levels accordingly via the CYC mobile app. It’s lighter than most pre-built e-bikes The added weight of the CYC mid-drive motors is minimal after you have removed the original bottom bracket and installed the motor. One of the main advantages are that the weight is located directly at the bottom bracket, which means that the bike’s handling remains unaffected. With the X1 PRO, you will only add around 3.5-4 kg to your original bike. With the X1 Stealth, you will only add around 2-3kg. Depending on the battery you’ve installed, you will add another 3-4kg, but you can also choose to place the battery in a backpack to keep your bike as light and as balanced as possible. The typical pre-built e-bike weighs over 20kg but with the CYC mid-drive motors, you can build a much more powerful and lighter e-bike that’s customized according your needs. It still feels like a proper e-MTB with torque sensing & pedal assist A lot of reviews out there have criticized conversion kits for not feeling like a “real” e-bike. With the CYC mid-drive motor kits, this critique is totally outweighed as you can completely customize your riding experience and set it as “e-bike-like" as you wish through the CYC Motor mobile app. The CYC conversion systems are already equipped with built in torque and cadence sensors, which are the same sensors you’ll find in pre-built mid-drive e-bikes. Some riders prefer the natural riding feeling, and others want to feel a sensation that’s closer to a motorbike. Whichever way you prefer, it’s possible! Plus, you can still adjust the power level to your region's legal limit so that it’s completely street and trail legal wherever you are. You don’t have to say goodbye to your current bike Probably one of the best reasons to choose a CYC conversion kit, is that you don’t need to put your current stallion away like a toy that’s being replaced. Rather than replacing your current, and probably loved, bike, you can keep it and simply add the power. Since the CYC motors are designed to fit all common frame types, it’s just too easy. It’s made to fit 95% of all existing frames Are you able to convert your bike into an e-bike? More than likely, the answer is YES! With different bottom bracket options to choose from and flexible mounting positions, the CYC motors are designed uniquely to fit all common frame types. It’s also our mission to close that 5% gap and our promise to keep developing for the best fit on every frame type possible. It’s quick and easy, on and off Setting up your CYC kit is actually quite simple, especially if you’ve done it once. The best part is that it’s just as easy to remove it. The switch between e-bike and bike is 30 minutes or less. Not that you would really need to take it off as you can choose to keep the system switched off and ride normally without any resistance. It saves your wallet While it’s no secret that e-bikes are very expensive for the average user, choosing to convert, is a much more affordable way to get the same result. With most quality e-bikes stretching over $2000 easily, you can expect half the price for triple the power with a CYC motor. These are only 7 of the many reasons to convert to an e-bike powered by CYC. Not to mention the unprecedented customer support, compatibility with numerous set-ups such as a Gates belt-drive, and unmatched small form factor. Too good to be true? Check out our gallery to see many conversions made by our customers around the world.