What Is S1 and S2 on Di2?

Pressing This Button Twice Will Cycle Through the Three Shift Modes. the Default Mode Configuration Is as Follows: Mode M - Full Manual Shifting. Mode S1 - Semi Synchro Shift. Mode S2 - Full Synchro Shift.

How Do You Know When Your Di2 Is Fully Charged?

Press and Hold Any of Your Shifting Buttons for at Least Half a Second. the Colour and the Amount of Flashes of the Junction Box Led Indicates How Much Charge Is Left.

How Do I Get Di2 out of Adjustment Mode?

By Pressing the Smooth Switch on the Shifter You Normally Use to Shift into a Lighter Gear, the Front-Derailleur Moves Towards the Small Chainring with Micro Adjustments. Now You Can Depress the Button on the Junction Box for Another 5 Seconds to Exit the Setting Mode.

Does Di2 Self Adjust?

The Di2 Does Not Adjust Itself. It Does, However, Know How Far Apart Your Gears Are. Once You've Got One Gear—a Central One—Adjusted, the Others Are Automatically Correct, as Well. If You Hear the Chain Rubbing on Any of the Gears, Then You Can Use the Special Adjustment Mode to Fix It.

How Do I Reset My Di2 Gears?

To Reset Crash Mode on 10-Speed (6770) and 11-Speed Di2 (6870, 9070, R8050, R9150, Grx), You Get on Your Bike and Press and Hold the Button on Your Junction Box for 5 Seconds Until a Red Light Flashes. the Rear Derailleur Will Now Go Through All the Gears, So Make Sure Sure You Spin the Cranks Until It's Done.

How Do I Reset My Di2 Front Derailleur?

To Reset the System, Press the Button on the Handlebar Switch (Sm-Ew79A) for at Least Five Seconds to Re-Connect the Solenoid to the Parallelogram. Double Check the Shifting and Fine Tune the Derailleur, Using the Shift Adjust Mode as Necessary.

What Is Rd Protection Reset?

Rd Protection. Reset. Complete. When the Red Led on Junction (A) Is Illuminated, the Rear Derailleur Cannot Shift Gears. Press the Button Until the Red Led Turns Off.

How Do You Diagnose Di2 Problems?

Select 'Error Check' from the Menu on the Left Side of the Screen and Make Sure You Check the 'Battery Consumption' Checkbox at the Bottom of the Window. the Software Will Now Check Each Component for Possible Battery Consumption Issues. Once It Is Done It Will Tell You Which Components Require Further Testing.

What Is Synchro Shift?

What Is Synchro Shift? According to Shimano; “Synchronized Shift Is a Function That Automatically Shifts the Front Derailleur When the Rear Derailleur Is Shifted, Allowing the Derailleurs to Work Together Efficiently. ” This Means That You Would Never Manually Have to Shift the Front Derailleur Anymore.

Does Di2 Need to Be Tuned?

Shimano Di2 or Campagnolo Eps Shifting or Not, Bikes Still Need Tune-Ups! Those Who Have Bikes with Shimano's Di2 Electronic Shifting System Know That They No Longer Have to Worry About Such Things as Cable Stretch, Regular Derailleur Adjustment, and Derailleur Cable and Housing Replacement.

How Do You Adjust B Tension Screws?

To Increase the Gap, Tighten the B Screw. to Decrease the Gap, Loosen the B Screw. If You Do Make Significant Changes to the B Screw, Double Check the Indexing Adjustment. Otherwise You Are Done, and Your Derailleur Is Properly Adjusted.

What Is B Tension Screw?

B-Tension Is an Adjustment Using That Mysterious Third Screw on the Back of Your Rear Derailleur. Its Proper Adjustment Is the Final Step to Clean and Quiet Shifting. It Also Provides a Degree of Chain Tension Assuming: Chain Is Properly Installed and the Right Length.

How Long Should a Di2 Battery Last?

A Shimano Bt-Dn110 Battery Should Last for at Least 2000Km per Charge. When Used Normally You Can Expect to Get About 2500-3000Km of Riding out of a Single Charge, Depending on How Often You Shift and How You Shift. a Di2 Front Derailleur Uses About 4 Times More Power Than a Rear Derailleur Will per Shift.

What Happens When Di2 Battery Dies?

It Doesn't Switch Back to Mechanical When the Battery Dies

Where Is the Di2 Battery?

The Shimano Bt-Dn110 Internal Di2 Battery Can Be Installed in a Number of Places: the Fork, Mtb Handlebar, a Really Long Stem. . Anywhere That Fits Really. You Will Most Often Find It Installed in the Seatpost and for Good Reason: This Way It Is Close to Junction B and the Bike's Derailleurs.

How Do I Find My Di2 Firmware?

The Other Method to Check for Updates Is to Connect Your Bike to a Computer. Plug in the Charger, Run E-Tube Project, Select Your Bike Type and Connect'. After the Connection Check Is Complete the Application Will Let You Know About Any Components That Have Outdated Firmware.

How Do You Disconnect a Di2 Battery?

Use a J-Bend Spoke to Extract Your Di2 Battery from the Seatpost

What Does the Button on My Di2 Do?

By Marcus Vance

• Oct 9, 2026 • 5 min read

Direct Answer • Key Takeaway

Shift the Di2 Front Derailleur If You Find It Hard to Remember Which Button Shifts up or Down, Think of It This Way: Pressing the Larger Button Will Shift to a Larger Chainring. Pressing the Smaller of the Two Buttons Will Shift to the Small Ring - an Easier Gear.

Marcus Vance

Cybersecurity & Digital Privacy Researcher

Marcus Vance is a cybersecurity auditor and technology writer dedicated to educating the public about online safety, data privacy regulations, enterprise security, and emerging cyber threats.

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