01 More About the X1 PRO
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 exceedingly 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.
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.
03 Choosing the Right Bottom Bracket
The X1 PRO kit support several bottom brackets, including the traditional BSA threaded bottom bracket, and press-fit bottom brackets such as the BB92 with a width of up to 92mm.
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. BSA threaded and press-fit bottom brackets are the most common among mountain bikes. Below is a guide to help you check which bottom bracket you have, and how to choose the correct option for your CYC Motor kit.
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.
Bottom Bracket Wrench
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.
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 inbetween.
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.
Set of press-fit bottom bracket removal tool
Currently, we only support BB92 press-fit bottom brackets with a width of up to 92mm. The bottom bracket diameter of the BB92 is 41mm.
Which bottom bracket option should I choose?
Kindly refer to the chart below for reference:
click to enlarge
05 Choosing the Controller & Display Options
CYC Motor currently offers two types of controllers supplied by ASI Technologies for the X1 PRO, namely the BAC855 and BAC2000 controller. The power capabilities of the two options can be listed as follows:
- 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 BAC855 is integrated between the mounting bracket of X1 PRO, meaning that you would not need to mount the controller independently. On the other hand, the BAC2000's dimensions are too big and needs to be mounted independently from the mounting bracket to the frame. We have left a very adequate wiring length for the BAC2000 option to give you the maximum flexibility.
CYC Motor further supplies you with a mounting bracket for extra stability which is included in the kit.
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). The BAC855 requires 50A continuous and 65A peak battery current to run at its maximum performace.
BAC855 voltages and expected power:
72V = 3200W peak
60V = 3000W peak
52V = 2800W peak
48V = 2650W peak
36V = 2000W peak
The BAC2000 controller can handle 200A maximum phase current (7N.m. or torque form the motor and 250N.m. at the crank). The BAC200 requires 80A continuous and 100A peak battery current to run at its maximum performance.
BAC2000 voltages and expected power:
72V = 5500W peak
60V = 5000W peak
52V = 4500W peak
48V = 4000W peak
36V = 3000W peak
The two 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 ASI BacDoor 2.0 mobileapp (for iOS and Android devices).
The new Gen 3 CYC Motor App is currently under construction, which will also support ASI controllers and include more features.
- 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.
06 Choosing the Throttle & Pedal Assist Options
CYC Motor supplies three throttle options, namely the thumb throttle and two different half-twist throttles. All three options of the throttles have the same function and settings, you only need to choose according to your preference.
Pedal Assist Options
There are two pedal assist options: the torque sensor option and the cadence sensor option.
The torque sensor option includes both a torque sensor and a cadence sensor inside the spindle. The main feature of the torque sensor is to sense and provide assist when there isn’t any crank rotation. This is because all that the torque sensor needs, is a change in the force applied on the pedal. In other words, the motor is able to provide assist even when the bike is on stand-still. This is particularly useful when you are trying to pedal from stand-still on a slope. As soon as you step on the pedal, the bike will start moving.
On the other hand, the cadence sensor does not have the same functionalities as the torque sensor. It will still provide the necessary assist with respect to your bike speed, meaning that the motor will provide a good amount of power and speed to make your riding experience less difficult. It differs in the sense that this option will not be as effective at offering assistance from a stand-still position. The greatest advantage of the cadence sensor is that it is a lot lighter than the torque sensor due to the design and the components of the whole cadence sensor setup.
07 Power Output, Top Speed & Batteries
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.
The controller has a battery current limit at 65A and can support 50A continuous. The maximum power output of the motor is equal to the battery voltage multiplied by the maximxum current.
With the BAC855, the maximum power of the motor is thus:
2800W with 36V batteries
3500W with 52V batteries
4000W with 60V batteries
5000W with 72V batteries
Keep in mind that the BAC855 controller has a maximum output power of 3600W, meaning that if you run a higher voltage, the battery current may be limited to stay within the threshold of 3600W.
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 100A continuous. The maximum power output of the motor is equal to the battery voltage multiplied by the maximum current.
With the BAC2000, the maximum power of the motor is thus:
3600W with 36V batteries
5200W with 52V batteries
6000W with 60V batteries
7200W 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.
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%.