Electronic groupsets (Shimano Di2, SRAM eTap AXS, Campagnolo EPS), in addition to manual operation (just like a cable-actuated groupset), introduce additional shifting modes:
Semi-automatic mode (Semi-Auto)
Sequential mode (Full-Auto)
These modes automate all or part of the shifting process — but they require prior configuration to be fully exploited.

Semi-automatic mode (Semi-Auto): front derailleur shift compensated by an automatic rear shift

In semi-automatic mode (called Semi-Synchronized Shift on Shimano Di2), the system automatically compensates the rear sprocket position when you change chainring.
Concretely: when you shift the front derailleur, the system compensates the gear ratio change caused by the chainring shift with a pre-set number of sprocket steps.
So when you shift up to the big chainring, the system automatically moves up x sprockets.
Conversely, when you shift down to the small chainring, the system compensates by moving down y sprockets. (x and y can be different)
Depending on your configuration, you can choose the number of compensation sprockets for upshifts and downshifts (1, 2 or even 3).

The rider continues to control both the rear and front derailleurs manually.

For a smooth experience, it is important to analyse your drivetrain in order to optimise the development jumps when changing chainring. This optimisation greatly improves comfort and allows you to get the most out of electronic groupsets.

Sequential mode (Full-Auto): one single control for all gears

In sequential mode (called Synchronized Shift on Shimano Di2), the rider only manages one control via the rear derailleur shifter. The system automatically orchestrates front and rear derailleurs to step through all gears in order, from the smallest to the largest development, without ever passing through a chain cross position.

This is the most intuitive mode, ideal for riders who want to focus on effort without managing the logic of the drivetrain.
It also frees up the lever originally dedicated to the front derailleur for other functions (switching computer pages, for example).

Preparing your configuration before a ride

The power of this tool lies in previewing your drivetrain’s full sequence before heading out. By entering your chainring and cassette tooth counts, you get:

• The ordered list of all available gears in sequential mode
• Overlaps between chainrings: two gear ratios with nearly identical development from different chainrings — ideal transition points for changing chainring without breaking rhythm
• Chain cross zones to avoid (big chainring + big sprocket, small chainring + small sprocket)
• Development jumps between each consecutive gear

Enter your chainring and cassette tooth counts below to visualise your drivetrain’s full sequence and prepare your electronic derailleur configuration.