Contents01/04Electronic tuning kits
All e-bike tuning kits solve the same problem – removing the 25 km/h assist limit – but they do it differently. There are two main types: electronic (wire-based) and mechanical.
Electronic tuning kits
An electronic kit connects between the motor and the speed sensor, usually under the motor cover. It processes the sensor signal and passes a "reduced" speed to the controller. Examples: SpeedBox, PearTune, VOLspeed, BadassBox, SpeedFun.
- Pros: often app-controlled (real speed, trip data, on/off), fit many motors, invisible from outside.
- Cons: installation means removing the motor cover and unplugging connectors; some systems can detect electronic modification.
Mechanical tuning kits (SPEEDi)
SPEEDi mounts at the rear brake disc. A planetary gear made of self-lubricating acetal changes how the sensor magnet rotates, so the controller sees a lower speed. No wires or electronics.
- Pros: fully mechanical, no changes to electronics, quiet and maintenance-free, works on systems that detect electronic kits.
- Cons: chosen for a specific bike model and year, no app, the display shows the reduced speed.
Comparison
| Electronic | Mechanical (SPEEDi) | |
|---|---|---|
| Installation | Under the motor cover, connectors | At the rear disc, 6 bolts |
| App / real speed | Often yes | No |
| Chosen by | Motor | Bike model and year |
| Removal | Unplugs without changes | Refit the original magnet |
Common installation mistakes
Most problems happen during installation, not riding:
- Wrong kit for the motor – check motor, display and model year before ordering.
- Pinched or damaged cables – route cables carefully when refitting the motor cover.
- Badly fitted magnet or SPEEDi – tighten SPEEDi bolts to 5–6 Nm with threadlocker, bolt heads below the backing plate surface; do not lubricate – the acetal is self-lubricating.
- Activating too early – on a brand-new bike ride at least 1 km before activating a SpeedBox.
- Ignoring the instructions – every kit has its own steps and video guides; take your time.
If in doubt, send us a message or visit our workshop in Kaunas – we can fit it for you. More about kits in E-bike tuning kits explained.
