You can make an eBike faster by adjusting the speed limiter, upgrading the controller, or increasing battery voltage but most factory eBikes like Trek and Specialized are limited to 20–28 mph. Removing limiters may affect legality and warranty depending on local laws.
Speed gains usually depend on the motor controller and voltage capacity. Higher voltage batteries (for example 48V instead of 36V) allow motors to spin faster, but compatibility must be checked to avoid damaging the system.
Steps commonly used by riders:
- Adjust or remove the speed limiter in the display settings
- Upgrade to a higher-voltage battery (if compatible)
- Replace the motor controller with a higher-amp unit
- Install a speed-unlock dongle designed for your motor system