Adjustment mode is a feature of Shimano Di2 electronic groupsets that allows you to fine-tune the rear derailleur position using the shift buttons. It is a way to adjust the shifting performance and eliminate any noise or rubbing of the chain on the cassette.
How to use Adjustment Mode
Some examples of adjustment mode for cycling are:
- To enter adjustment mode, you must shift the front derailleur to the small chainring and the rear derailleur to the fifth largest sprocket. Then, press and hold the button on your junction box until the red LED illuminates, indicating you are in adjustment mode.
- To exit the adjustment mode, you need to press the button on the junction box again until the red LED turns off. You can also exit adjustment mode by turning off the system or not pressing any buttons for more than five minutes.
- To adjust the rear derailleur position, you need to use the shift buttons on the right shifter. The upshift button moves the derailleur inward, while the downshift button moves the derailleur outward. You can make minor adjustments by pressing the buttons briefly or larger adjustments by pressing the buttons longer.
- To set the high and low limit screws, you need to shift the rear derailleur to the smallest and largest cogs, respectively. Then, you need to use the end adjustment screw to position the pulley wheels closer to the cassette teeth, making sure that the chain does not jam. You can also use the shift buttons to fine-tune the derailleur position.
Alex Lee is the founder and editor-at-large of Mr. Mamil. Coming from a professional engineering background, he breaks down technical cycling nuances into an easy-to-understand and digestible format here.
He has been riding road bikes actively for the past 12 years and started racing competitively in the senior category during the summer recently.