Chainrings
CYC Chainrings are all narrow-wide
Which means your chain is less likely to fall off and will grip the chain a lot better.
What chainring option should I choose?
This would depend on your preferred level of assistance, environment, and riding style.
Generally, smaller chainrings (such as 35-38 teeth) provide a lower gear ratio, making it easier to climb hills and handle steeper terrain.
Larger chainrings (such as 44-48 teeth) provide a higher gear ratio, making it easier to reach higher speeds on flatter terrain.
It's also important to consider the motor power, gear ratio and tire size when selecting a chainring option to ensure a smooth and efficient ride based on the riding you're opting for.
High gear ratio vs Low gear ratio
To calculate gear ratio, divide the number of teeth on the chainring by the number of teeth on the rear sprocket.
For example, if your chainring has 42 teeth and your rear sprocket has 11 teeth, your gear ratio would be 42/11 = 3.82.
Total reduction ratio to crank
11/53, 11/63, 12/72 will result in different reduction ratio to the crank. The motor is 150kV, so the nominal RPM is 7800 RPM at 52V. The first stage planetary gearbox is 1:6.
11/53 configuration: The total reduction ratio to crank will be 1:28.9, giving the RPM at crank at max 270 RPM at 52V.
11/63 configuration: The total reduction ratio to crank will be 1:34.4, giving the RPM at crank at max 226 RPM at 52V.
11/72 configuration: The total reduction ratio to crank will be 1:36.6, giving the RPM at crank at max 217 RPM at 52V.
Each of these option comes with different stock 104BCD chainring going to rear wheel. You can replace the chainring with any 104BCD standard bicycle chainring.
- 11/53 configuration will come with a 32T stock bike chainring
- 11/63 configuration will come with a 38T stock bike chainring
- 11/72 configuration will come with a 40T stock bike chainring
Why so many options?
11/53 and 11/63 chainring will give higher ground clearance.
- 53T 219H chainring has a diameter equivalent to 32T bike chainring
- 63T 219H chainring has a diameter equivalent to 38T bike chainring
- 72T 219H chainring has a diameter equivalent to 42T bike chainring
Swapping out Photon Chainring
You will need the entire "Photon sprocket set", you cannot purchase the sprocket alone to change the size as the sizes for all parts included are different.
The sprocket set contains:
- Photon 34T Chainring Adaptor
- Photon 34T Sprocket
- Photon 34T Carbon Chain Cover