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 [email protected] to schedule a re-tuning session. Harness sold separately — confirm compatibility before ordering.
