Shimano E-Tube Project

Summary

Shimano E-TUBE PROJECT is a software platform used to configure, update, inspect, and service compatible Shimano electronic bicycle components. Depending on the bicycle and software version, it can customize Di2 shifting, tune e-bike assistance, configure AUTO SHIFT, display error information, update firmware, and recover malfunctioning electronic units.

E-TUBE PROJECT should not be confused with E-TUBE itself. E-TUBE is Shimano’s electronic communication and wiring architecture; E-TUBE PROJECT is the software used to interact with compatible components on that network.

Key Facts

Category: Software / Service Technology
Software lineage introduced: 2009
Current applications: E-TUBE PROJECT Cyclist and E-TUBE PROJECT Professional
Cyclist platform: iOS and Android
Professional platform: Windows
Connections: Bluetooth LE or a supported Shimano PC-linkage device
Professional interface: Commonly Shimano SM-PCE02
Primary functions: Customization, firmware management, connection checks, diagnostics, and firmware recovery
Supported products: Compatible Di2, Shimano e-bike systems, electronic shifting components, and selected power meters
Wiring generations: EW-SD50 and EW-SD300, subject to Shimano’s compatibility charts
Important limitation: Available settings and connection methods vary substantially by component generation

Overview

E-TUBE PROJECT is the service and configuration layer behind many Shimano electronic bicycle systems. It provides access to settings that cannot be changed mechanically, including switch assignments, multi-shift behavior, synchronized shifting, motor-assist profiles, and selected automatic-shifting functions.

The software’s documented history is older than commonly stated. Shimano’s Professional release history identifies April 2009 as the first software edition, with support expanding through the early 2010s to Ultegra Di2, Dura-Ace 9070, Alfine Di2, electronically controlled suspension, and later Shimano e-bike systems. Shimano E-TUBE PROJECT Professional

Today, E-TUBE PROJECT is divided into two principal applications:

E-TUBE PROJECT Cyclist: A mobile application intended for rider-accessible customization, status checks, and compatible wireless firmware updates.
E-TUBE PROJECT Professional: A Windows application intended for dealer-level wired inspection, maintenance, diagnostics, and recovery.

Not every E-TUBE component works with both applications. Older systems may require an earlier software path, a specific connection device, or Professional rather than Cyclist. Shimano’s current compatibility chart—not connector appearance alone—is the controlling reference.

E-TUBE PROJECT vs E-TUBE

The names are related but refer to different things.

E-TUBE

E-TUBE is Shimano’s electronic system architecture. It includes:

Electronic components
Communication protocols
Batteries and power distribution
E-TUBE wires and junctions
Wireless communication where equipped
EW-SD50 and EW-SD300 connector families

E-TUBE PROJECT

E-TUBE PROJECT is the software used to communicate with supported E-TUBE systems. It can read component information and, within Shimano-defined limits, change settings or write firmware.

E-TUBE RIDE

E-TUBE RIDE is a separate mobile application primarily used as a ride display and data interface. It is not the main firmware, diagnostic, or component-configuration application. Shimano E-TUBE RIDE

How It Connects

Bluetooth LE

E-TUBE PROJECT Cyclist connects wirelessly through a compatible component equipped with Bluetooth LE.

Depending on the system, the wireless access point may be located in:

A rear derailleur
A cycle computer or display
A wireless unit
An e-bike system component

The presence of Di2 does not automatically mean Bluetooth connectivity is available. Some older systems require an additional wireless unit, while others can only be accessed through a wired service connection.

Wired PC Connection

E-TUBE PROJECT Professional uses a supported Shimano PC-linkage device, most commonly the SM-PCE02. This is not an ordinary USB-to-E-TUBE cable. The linkage device provides the required communication interface between the Windows computer and the bicycle or individual component. Shimano PC-linkage device manual

A wired connection can be used for:

Complete bicycle connection checks
Component identification
Firmware updates
Error-log review
Service reports
Individual component testing
Firmware recovery

The required wires, adapters, and connection point depend on the system.

Wiring Generations and Compatibility

Shimano currently has two major E-TUBE connector families.

EW-SD50

The larger two-wire connector used across many earlier road, MTB, internal-gear, and Shimano STEPS systems.

EW-SD300

A smaller connector used by newer Di2 and Shimano e-bike systems.

Shimano offers the EW-AD305 adapter for certain SD50-to-SD300 connections, but physical connection does not prove that two components are electronically compatible. Firmware, battery generation, master-unit requirements, and permitted component combinations still apply.

Shimano warns that connecting a device not shown in the applicable E-TUBE PROJECT compatibility chart may prevent the entire system from operating. Shimano E-TUBE PROJECT compatibility chart

Firmware Management

Each electronic component contains its own firmware. A bicycle may therefore contain several different firmware versions at the same time.

Firmware updates may:

Correct documented faults
Improve communication stability
Add support for compatible components
Refine motor or shifting behavior
Enable specific functions
Resolve version conflicts

An update should not be assumed to add every current feature to older hardware. New functionality may require different electronics, sensors, wiring, batteries, derailleurs, or drive units.

Firmware compatibility can also be interdependent. Updating or replacing one component may require updates to other components before the complete system operates correctly.

Interrupted Updates

Wireless firmware updating introduces a risk that does not exist with ordinary mechanical service. If Bluetooth communication is interrupted while firmware is being written, the affected unit may stop communicating normally.

Shimano states that some failed wireless updates require firmware recovery through an SM-PCE02 or another specified wired method. A component that disappears after an interrupted update is therefore not necessarily defective. E-TUBE PROJECT Cyclist manual, E-TUBE PROJECT Professional manual

Di2 Customization

Available Di2 settings depend on the drivetrain generation. Supported functions may include:

Shift-button assignment
Multi-shift activation
Number of shifts per command
Multi-shift speed
Manual, synchronized, or semi-synchronized shifting
Front-shift mapping
D-FLY channel assignment
Wireless switch pairing
Rear-derailleur adjustment
Power-meter firmware updates

Synchronized shifting coordinates the front and rear derailleurs according to a programmed shift map. Semi-synchronized shifting compensates at the rear derailleur after a commanded front shift. These functions are limited to compatible multi-chainring systems.

Newer systems may also support functions such as FRONT SHIFT NEXT, which allows one assigned button to alternate front-derailleur direction. Availability depends on the exact components and firmware. Shimano E-TUBE PROJECT Cyclist FAQ

E-Bike Assist Customization

Compatible Shimano drive units expose motor settings through E-TUBE PROJECT Cyclist and Professional.

Depending on the drive unit, settings may include:

Assist character
Maximum torque
Assist strength at startup
Number of available assist levels
BASIC MODE or FINE TUNE MODE
Two assist profiles

On supported EP801 and EP600 systems, FINE TUNE MODE can provide a larger number of intermediate assist levels than the conventional ECO, TRAIL, and BOOST arrangement. Shimano lists assist character, maximum torque, and assist start as the primary adjustable parameters. Shimano E-TUBE PROJECT customization guide

Available ranges are determined by the drive unit, firmware, bicycle manufacturer, and market. E-TUBE PROJECT cannot legitimately remove regulated speed limits or increase the motor beyond approved system parameters.

AUTO SHIFT and FREE SHIFT

AUTO SHIFT and FREE SHIFT are not software-only upgrades.

They require compatible combinations of:

Shimano drive unit
Electronic rear-shifting unit
Sensors
Firmware
Battery and wiring architecture
Bicycle-manufacturer configuration

On supported EP801 and EP600 systems, E-TUBE PROJECT may allow adjustment of:

AUTO SHIFT while pedaling
Automatic FREE SHIFT
Shift timing
Climbing response
Starting gear
AUTO 1 and AUTO 2 profiles

FREE SHIFT allows the drivetrain to change gear while the rider is coasting by using controlled drive-unit rotation to move the chain. AUTO SHIFT uses system inputs to select gears without every shift being manually commanded. The exact functions available vary by rear derailleur and drive-unit combination. Shimano AUTO SHIFT customization manual

Cyclist vs Professional

Function	E-TUBE PROJECT Cyclist	E-TUBE PROJECT Professional
Platform	iOS and Android	Windows
Typical connection	Bluetooth LE	SM-PCE02 wired interface
Rider customization	Yes, where supported	Yes
Firmware updating	Yes, on compatible systems	Yes
Error and warning display	Basic supported information	Detailed system inspection
Connection check	Limited by system	Full wired check
Error-history review	Limited	Expanded e-bike error logs
Service report	No or limited	Yes
Firmware recovery	Limited	Yes, with supported hardware
Primary user	Rider or owner	Dealer or experienced technician

Professional software may be publicly downloadable, but its safe and complete use assumes the correct connection device, service documentation, and component knowledge.

Diagnostics

E-TUBE PROJECT Professional can identify which units are communicating and display recorded information from compatible systems. On Shimano e-bikes, this can include drive-unit or battery error history. Shimano E-TUBE PROJECT Professional manual

A recorded code does not automatically prove that the named component has failed. Communication errors may result from:

Damaged E-TUBE wires
Partially seated connectors
Contaminated ports
Battery-voltage problems
Incompatible components
Interrupted firmware
Faulty junctions
Sensor or magnet alignment
Intermittent connections under frame movement

Software results should be combined with physical inspection and component isolation.

Mechanic’s Perspective

E-TUBE service begins with identifying the system, not connecting software.

Record the Existing Configuration

Before changing anything, document:

Complete component model numbers
Battery model
Drive-unit model
Display or junction model
Rear- and front-derailleur models
Shift-switch models
SD50 or SD300 wiring
Existing assist and shift settings
Current firmware versions
Customer’s original complaint

Photographing customization screens before an update or replacement makes it possible to restore the rider’s preferred setup.

Check Compatibility First

Do not assume that components are compatible because their plugs fit or because an adapter exists. Check the current Shimano compatibility chart for the complete proposed system.

This is particularly important when mixing:

SD50 and SD300 parts
Different battery generations
Legacy road or MTB Di2
E-bike and conventional Di2 switches
Replacement displays
Different generations of wireless units
New derailleurs with older junctions

Use the correct Shimano plug tool for the connector family. Pulling E-TUBE wires by the cable or forcing the wrong tool into a port can damage the connector.

Before a Firmware Update

Before starting:

Charge the bicycle battery sufficiently.
Charge the phone or connect the computer to reliable power.
Confirm the application is current.
Verify the exact bicycle and component compatibility.
Record existing settings and firmware.
Close unnecessary Bluetooth connections and ride applications.
Keep the phone close to the bicycle.
Prevent the app from being backgrounded or interrupted.

Do not operate shift switches, disconnect wires, switch off the bicycle, or remove the battery during an update unless Shimano’s procedure specifically instructs it. Shimano documents that operating a shift switch during a wired firmware update can leave a unit requiring restoration. E-TUBE PROJECT Professional FAQ

Avoid performing a nonessential update immediately before a race, trip, or customer pickup. Allow time for recovery and a complete function test.

When Bluetooth Will Not Connect

Check:

Whether the system actually has Bluetooth capability
Bicycle battery state
Whether the system is awake and in connection mode
Whether another phone, head unit, or app is connected
Phone Bluetooth and application permissions
E-TUBE PROJECT version
Wireless-unit firmware
Distance between the phone and bicycle

Initiate pairing through the Shimano application and follow the model-specific connection procedure. Do not repeatedly delete, reset, or update components without first confirming the correct connection path.

After a Failed Update

If a unit disappears during an update:

Do not assume the component has failed permanently.
Record the displayed error.
Follow Shimano’s documented recovery procedure.
Use E-TUBE PROJECT Professional and SM-PCE02 where required.
Select the exact component model when performing manual restoration.

Shimano warns that selecting the wrong model during firmware restoration can make the unit unusable.

Diagnosing a Missing Component

A connection check only proves whether the software can communicate with a unit. If a component is absent, inspect the network between the linkage device and that component.

Test:

Wire seating
Wire continuity using Shimano-approved procedures
Junctions and adapters
Battery power
Compatible component combinations
Individual components where supported

A missing derailleur may be caused by its wire, junction, adapter, battery connection, or firmware—not only the derailleur itself.

Component Replacement

After installing an electronic replacement component:

Confirm compatibility before powering the system
Update firmware as required
Perform system pairing
Restore button and shift settings
Complete derailleur adjustment
Run a connection check
Test every switch and operating mode
Confirm charging and wireless communication
Road-test the bicycle

For e-bikes, verify assist behavior, speed indication, wheel-sensor operation, and all stored error information before returning the bicycle.

Common Problems

Symptom	Likely causes
App cannot find bicycle	No compatible wireless unit, system not in connection mode, low battery, another device connected
One unit missing in Professional	Disconnected wire, damaged port, failed junction, incompatible unit, interrupted firmware
Entire system stops after adding a part	Unsupported component combination or mixed wiring generation
Wireless update fails	Bluetooth interruption, low battery, app backgrounding, communication loss
Motor settings are unavailable	Drive unit or firmware does not support them, OEM restriction, incompatible configuration
Shifting works but buttons perform wrong functions	Switch assignments changed or replacement unit not reconfigured
New wireless shifter does not operate	Pairing incomplete, battery issue, unsupported firmware or component combination
Recurring e-bike error	Wiring, sensor, battery, drive-unit, or communication fault requiring code-specific diagnosis
System works intermittently over bumps	Partially seated connector, damaged wire, battery contact, or frame-related harness movement

Notable Implementations

Dura-Ace, Ultegra, and 105 Di2

Compatible modern road systems use E-TUBE PROJECT for wireless pairing, switch assignment, shift-mode configuration, firmware, and drivetrain adjustment.

GRX Di2

Compatible GRX systems use E-TUBE PROJECT for gravel-specific switch configuration and shifting behavior. Current architecture varies between wired 2× systems and newer wireless 1× configurations, so generation-specific compatibility is essential.

EP801 and EP600 E-Bike Systems

These drive units support advanced assist-profile customization and, with compatible electronic drivetrains, selected AUTO SHIFT and FREE SHIFT settings.

Legacy XTR and XT Di2

M9050 XTR and M8050 XT illustrate earlier E-TUBE-based MTB integration. Current access may require specific software, batteries, displays, wireless units, or Professional connection methods.

Shimano Power Meters

Selected Shimano power meters use E-TUBE PROJECT for firmware management and supported configuration functions.

Common Misconceptions

“E-TUBE and E-TUBE PROJECT Are the Same Thing”

No. E-TUBE is the electronic system architecture; E-TUBE PROJECT is the configuration and service software.

“Every Di2 Bike Connects Directly to a Phone”

False. The system must contain a compatible Bluetooth-capable component.

“Professional Connects Through Any USB Cable”

False. It requires a supported Shimano PC-linkage device and the correct E-TUBE wiring.

“An SD50-to-SD300 Adapter Makes Everything Compatible”

False. The adapter only addresses the physical interface in approved configurations.

“Firmware Updates Always Add New Features”

False. New functions may require different hardware, sensors, wiring, or OEM support.

“AUTO SHIFT Can Be Added to Any Shimano E-Bike”

False. It requires specific drive-unit and shifting-component combinations.

“A Missing Component Is Automatically Defective”

False. Wiring, junctions, power supply, compatibility, and firmware must be checked first.

“A Failed Wireless Update Means the Component Is Ruined”

Not necessarily. Many interrupted updates can be recovered through the proper wired service procedure.

Related Terms

Di2
Shimano E-Bike Systems
E-TUBE RIDE
Firmware
Bluetooth LE
EW-SD50
EW-SD300
SM-PCE02
Synchronized Shift
AUTO SHIFT
FREE SHIFT
EP801
EP600

References

Shimano — E-TUBE PROJECT Cyclist
Shimano — E-TUBE PROJECT Professional
Shimano — E-TUBE PROJECT Professional User’s Manual
Shimano — E-TUBE PROJECT Compatibility Chart
Shimano — E-TUBE PROJECT Cyclist FAQ
Shimano — E-TUBE PROJECT Professional FAQ
Shimano — PC-Linkage Device Manual
Shimano — AUTO SHIFT Customization
Shimano — E-TUBE RIDE