Wire-⁠based vs mechanical e-⁠bike tuning kits: which is better?

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

Common installation mistakes

Most problems happen during installation, not riding:

1. Wrong kit for the motor – check motor, display and model year before ordering.
2. Pinched or damaged cables – route cables carefully when refitting the motor cover.
3. 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.
4. Activating too early – on a brand-new bike ride at least 1 km before activating a SpeedBox.
5. 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.