SpeedBox 1.3 Tuning Chip for Shimano EP8 – E-Tube Port Connection

The SpeedBox 1.3 for Shimano (EP8) is an e-bike tuning chip built for Shimano EP8 and Shimano EP8 RS mid-drive motors. It plugs into a free E-Tube port on your bike. The module removes the factory speed limiter, so motor assistance continues past the standard cut-off point.

This is the third-generation SpeedBox, rebuilt from the ground up. Both the hardware and the firmware are new. The module sits directly in the E-Tube chain, so no motor or wiring harness modification is needed. Control happens through the LIGHT button on your Shimano controller. The display continues to show real speed up to roughly 23 km/h.

Riders of mountain and gravel e-bikes choose this module most often, particularly those riding off-road or on private trails. It suits anyone who finds the factory assistance limit arriving too early on climbs and long routes. The chip also fits Giant Revolt e-bikes, where it works up to 35 km/h. Please note that it is not compatible with Shimano EP801 motors.

Key Benefits

• Speed limiter removal – unlocks the full potential of the Shimano EP8 motor wherever this is legal.
• LIGHT button control – lights off means SpeedBox is active, while lights on restores the factory limiter.
• Real speed on the display – your Shimano screen shows actual speed up to approximately 23 km/h.
• Clean installation – the module connects to the E-Tube port without any cutting or soldering.
• Colour-coded connectors – every plug is marked by colour, which reduces the risk of installation mistakes.
• Instant return to OEM mode – simply switch the lights on and the system behaves exactly as it did from the factory.
• No firmware hacking – nothing is rewritten or overwritten; this is a physical plug-and-play module.
• B.Tuning alternative available – the 1.3 B.Tuning version pairs with the SpeedBox app for data above 23 km/h.

Who Is This Chip For?

This module is designed for electric bikes running Shimano EP8 and Shimano EP8 RS mid-drive motors. Two conditions must be met before installation. First, your bike needs a free E-Tube port. Second, your Shimano controller must have a LIGHT function, since activation depends on it.

Beyond the standard EP8 platform, the chip is also compatible with the Giant Revolt, where it operates up to 35 km/h. However, it is not adapted for Shimano EP801 motors. If your bike build differs from a standard configuration, check the number of E-Tube sockets and connector compatibility before ordering.

Typical owners ride mountain and gravel e-bikes off-road or on private tracks. Long climbs are where the factory assistance cut-off is felt most sharply. Importantly, the SpeedBox does not increase motor power or torque. It only removes the software-based assistance cut-off speed, so the motor keeps helping beyond the factory limit. The rider still has to pedal.

Technical Specifications

Installation

The module is inserted straight into the E-Tube chain. No changes to the motor or the wiring harness are required. Colour-coded connectors show where each plug belongs, which keeps the process straightforward. After fitting, test the LIGHT button in both positions, ON and OFF.

Two practical points are worth remembering. If you are fitting the SpeedBox to a brand-new bike, ride at least 10 km before activating the chip. Additionally, always remove the SpeedBox from the bike before updating your e-bike firmware. Complete the update first, then reinstall the module.

Why Choose the SpeedBox 1.3 for Shimano EP8?

The 1.3 generation was rebuilt from scratch, with new hardware and new software throughout. Unlike tuning methods that alter motor firmware, nothing here gets rewritten. The module remains a physical part of the E-Tube chain, so you can take it out again whenever you want.

The standard 1.3 version shows real speed on the display up to roughly 23 km/h. If you need exact values and ride statistics above that figure, choose the 1.3 B.Tuning instead. That version streams real-time data to the SpeedBox app on your phone over Bluetooth.

SpeedBox is an independent Czech manufacturer. This is not a Shimano product and it carries no affiliation with the motor brand.

Frequently Asked Questions

Does this chip work with the Shimano EP801 motor?

• No, the SpeedBox 1.3 E-Tube Port version is not adapted for Shimano EP801.
• It covers Shimano EP8 and Shimano EP8 RS mid-drive motors.

Which bikes besides Shimano EP8 models are supported?

• The Giant Revolt is also compatible, working up to 35 km/h.
• A free E-Tube port remains a requirement in every case.

How do I switch the SpeedBox on and off?

• Activation runs through the LIGHT button on the Shimano controller.
• Lights off means the module is active; lights on restores factory behaviour.

Will my display still show the correct speed?

• Yes, the Shimano display shows real speed up to approximately 23 km/h.
• For accurate readings above that, the 1.3 B.Tuning version uses the SpeedBox app.

Does the chip make the motor more powerful?

• No, it does not raise motor power or torque.
• It only removes the software assistance cut-off, and you still pedal.

Do I need to cut or solder any wires?

• No, the module inserts directly into the E-Tube chain.
• Colour-coded connectors indicate where each plug goes.

What should I do before a firmware update?

• Remove the SpeedBox from the bike first.
• Run the update, then reinstall the module.

Is anything permanently changed on my e-bike?

• No firmware is overwritten, so the change is fully reversible.
• The module can be unplugged and removed at any time.

The SpeedBox 1.3 for Shimano EP8 gives owners of EP8 and EP8 RS e-bikes a reversible way to extend motor assistance. Installation takes minutes through the E-Tube port, control sits on a button you already use, and returning to factory settings takes one press. Check your E-Tube socket count and controller LIGHT function before ordering.