BAC4000 Retail

Free shipping. Ships within 1–2 days. Includes tuning.

The BAC4000 is the mid-tier ASI controller — a meaningful step up from the BAC2000 in peak output and throttle sharpness. Uses the same FOC architecture and adaptive sensorless start algorithm, tuned for higher-demand applications. Delivers up to 95% of rated motor torque without position sensors.

What this means for your ride

• Noticeably sharper throttle response versus the BAC2000
• Higher peak power output for demanding terrain and heavier loads
• Smooth, efficient FOC power delivery retained at all speeds
• Popular choice for CyberX owners who want more performance without going full BAC8000

Note: Does not include BACdoor access. If you have made changes to your bike setup, email your order number to info@xion.bike to schedule a re-tuning session. Harness sold separately — confirm compatibility before ordering.