Pear Tune MSO 4.0 BOSCH SMART + RIM magnet SX diagonal e-bike chip

Description

Want your BOSCH SMART e-bike to respond smoothly even at higher speeds when riding off-road? Pear Tune MSO 4.0 BOSCH SMART + RIM magnet SX diagonal gives you the freedom to pedal without the typical limitation.

Main benefits

PearTune MSO 4.0 removes the pedal-assist speed limit set to 25 km/h, so assistance doesn’t cut out during faster off-road riding. The tuning is intended for private property and off-road use.

The extended version offers personal settings in the chip’s service menu, so you can tailor the behavior to your riding style. You make changes directly via the e-bike controls, without complicated procedures.

Compatibility is designed for the BOSCH SMART Performance Line SX motor and common displays, so you don’t have to give up what you’re used to. Units such as Kiox 300, Kiox 500, Purion 200, or Intuvia 100 are supported.

Activation is simple and depends on your setup: with a single press of the WALK button, the -+-+ button combination, or the LIGHTS button. After activation, the e-bike controls remain natural and easy to read.

Technical specifications

Intended use: e-bike tuning for BOSCH SMART Performance Line SX with a RIM magnet on the valve.

Pedal-assist speed limit: fully removed compared to the 25 km/h limit.

Speed display: real values up to 22.5 km/h, after that the speed is shifted by the decimal point.

Compatibility: works with the Bosch 5/2026 update in version 19.54 and with the Bosch connect module.

Conclusion

Pear Tune MSO 4.0 BOSCH SMART + RIM magnet SX diagonal is a solution for riders who want to use the drive system’s potential off-road without the sudden “cut-off” of assistance. It fits setups with a RIM magnet and preserves the control logic and display behavior.

Keep in mind that after 22.5 km/h, the data on the display is shown with an offset, which is a common principle for this type of solution. Once you know what you’re looking at, you’ll still have a clear overview even at higher speeds.

Warning

The use of tuning devices for e-bikes is intended exclusively for sporting and racing purposes off public roads. By using the PearTune MSO device, the user agrees to operate the modified e-bike in accordance with the applicable legislation of the destination country. The user also acknowledges that operating bicycles outside their own property or property designated for this purpose, with the PearTune MSO chip installed but deactivated, may not comply with the legislation. Neither the manufacturer nor the seller guarantees that the bicycle’s factory warranty will not be voided, nor do they guarantee that damage to or blocking of the e-bike system cannot occur. The manufacturer disclaims any liability for personal injury or property damage that may arise in connection with the installation or use of this product.

Key features

• Settings in the chip’s service menu
• Compatibility with BOSCH SMART Performance Line SX
• For a RIM magnet on the valve
• Activation via WALK, -+-+ or LIGHTS

• Removal of the 25 km/h pedal-assist limit