Choosing the Right Setup for X1 Pro 4, Photon Pro, and Photon 2
Chainring selection plays a critical role in how a mid‑drive system delivers power. On a CYC setup, the chainring directly affects torque multiplication, cadence feel, drivetrain load, chainline, and overall ride behaviour.
This guide explains how chainring systems differ across X1 Pro 4, Photon Pro, and Photon 2, what options are available for each platform, and how to choose the right configuration for your build.
Why Chainring Choice Matters on Mid-Drive Systems
Why Chainring Choice
Matters on Mid-Drive Systems
At the core of the Photon 2 is a newly engineered inrunner motor, replacing the Gen 1 outrunner design.
In simple terms:
- Smaller chainrings provide higher torque at the wheel and improved climbing performance
- Larger chainrings favor higher top speed and lower cadence at cruise
- Poor chainline increases wear, noise, and shifting issues
is as important as choosing the motor itself.”
Chainring Systems at a Glance
| Motor | Chainring System | Primary Design Focus |
|---|---|---|
| Photon 2 | Direct-mount single chainring | Lightweight, efficiency, natural ride feel |
| Photon Pro | Direct-mount single chainring | Higher power capability with compact integration |
| X1 Pro 4 | Dual-stage reduction with motor chainring | Maximum torque handling and drivetrain protection |
Photon 2 Chainring Options
Photon 2 uses a direct‑mount single chainring attached directly to the motor body. This design prioritises efficiency, low system weight, and a clean mechanical layout.
32T | 34T | 36T | 38T | 40T | 42T | 50T
This wide range allows Photon 2 to be tuned for everything from steep trail riding to fast commuter and gravel setups.
Photon Pro Chainring Options
Photon Pro builds on the Photon platform with increased power and torque capability while retaining a direct‑mount single chainring system.
32T | 34T | 36T | 38T | 40T | 42T | 50T
The chainring options mirror Photon 2, but Photon Pro is intended for riders who require more sustained power output while maintaining a compact, lightweight system.
X1 Pro 4 Chainring System Explained
X1 Pro 4 is designed for extreme torque and power applications. To manage this safely and reliably, it uses a dual-stage reduction system.
- A smaller pedal-side chainring
- A larger internal motor chainring that multiplies torque before it reaches the drivetrain
X1 Pro 4 Chainring Combinations
- 32T front with 52T motor chainring
- 38T front with 63T motor chainring
- 40T front with 72T motor chainring
This system reduces drivetrain shock, improves low-speed control, and allows X1 Pro 4 to deliver very high torque without excessive wear.
Choosing the Right Chainring Setup
- Photon 2: 32T or 36T
- Photon Pro: 32T or 36T
- X1 Pro 4: 32T / 52T
- Maximum torque multiplication
- Improved climbing efficiency
- Better low-speed control
- Reduced drivetrain stress
- Photon 2: 38T or 40T
- Photon Pro: 38T or 40T
- X1 Pro 4: 38T / 63T
- Balanced cadence and speed
- Smooth power delivery
- Suitable for trail, road, and commuting
- Photon 2: 42T or 50T
- Photon Pro: 42T or 50T
- X1 Pro 4: 40T / 72T
- Higher top speed potential
- Lower cadence at cruising speed
- Best paired with reinforced drivetrains
Chainline Considerations
All three systems are designed to support common bottom bracket standards, but final chainline depends on frame geometry and spacer configuration.
- Aim for a straight chainline at mid-cassette
- Use provided spacers to fine-tune alignment
- Avoid sustained cross-chaining under power
A clean chainline improves shifting, reduces noise, and significantly extends drivetrain life.
Final Thoughts
There is no single best chainring, only the correct chainring for your build.
- Photon 2 prioritizes efficiency, weight, and natural ride feel
- Photon Pro adds power while maintaining a compact, single-ring design
- X1 Pro 4 is engineered for maximum torque with drivetrain protection in mind
