Install the front derailleur (FD) and rear derailleur (RD), but do not mount the chain.
Select the correct number of cassettes in the WHEELTOP app:
Go to Equipment Debugging > Replace Cassette > Cassette Speed, and choose the correct number of cassettes.
Initial Calibration of RD:
The groupset arrives in the default position: the largest front chainring for the FD and the smallest rear cassette for the RD. Please do not adjust the FD or RD before setting up the groupset.
Open the WHEELTOP app, navigate to Equipment Debugging > Initial Calibration, and use the '<' or '>' buttons to align the RD pulleys with the smallest cassette. Refer to the picture below for the correct position.

Note: Only perform the initial calibration when the RD is in the default position. If not, the RD may become stuck and unable to shift. If the RD is stuck, use the initial calibration '<' or '>' buttons to return it to the default position.

Mount the Chain.
Adjusting RD Shifting / Fine-tuning RD:
Rack the bike and ensure the chain is constantly moving while operating the RD to change gears.
If you hear any unusual sounds during shifting, fine-tuning is necessary. If there are no sounds, no adjustments are needed.
Open the WHEELTOP app. Navigate to Equipment Debugging > Fine-tuning Gear > Rear.
If shifting from gear 1 to 2 requires more than one lever click, select '2 Files' and gradually increase the value (by 5 or 10) until shifting is smooth and noise-free. After adjusting the value in the app, operate the shifters or controller to apply the changes.
If the RD jumps from gear 1 to 3, decrease the '2 Files' value accordingly. Again, operate the shifters or controller after making this adjustment.
Repeat this process for each cassette until the RD shifts smoothly.

RD Limit Screws 'D':
The position of the limit screw described below is a recommendation. Please adjust based on actual conditions.
While the RD is positioned at the smallest cassette, adjust screw 'D' until it makes contact with the RD, then turn it back by a quarter turn. (Refer to the picture below.)

RD Limit Screws 'E':
Adjust the screw 'E' while the RD is in the position of the biggest cassette, until the screw 'E' makes contact with RD, then turn it back for a quarter. (You could refer to the picture below)

Adjusting the FD
Ensure the chain is on the largest gear of the rear cassette and the largest chainring at the front.
While keeping the FD on the largest front chainring, shift the RD and check if the chain rubs against the FD.
If there is a chain rub, use the limit screw to adjust the FD's guide plates. Aim for a 0.5mm gap between the chain and the inner guide plate. (Note: The user manual and app may indicate a clearance of 3.5-5mm when the chain is not engaged, but the desired clearance while the chain is on is 0.5mm.)
Shift the FD to ensure it changes gears smoothly.