Insert the handlebars into the stem and tighten the screws. Make sure they are correctly aligned.

Insert the front wheel (if not already mounted) into the fork and tighten the axle. (It is recommended to grease the axle beforehand.)

Make sure the brakes are correctly installed and the brake pads are properly aligned.

Screw the pedals into the cranks. The right pedal has a right-hand thread, the left one a left-hand thread. Be sure to grease the pedal threads before installing them.

Check the height and angle of the saddle and adjust it if necessary.

Check and test the circuit to ensure it is working properly.

Check the tire pressure and inflate the tires if necessary.

Center the wheels using a spoke wrench if necessary.

Go through all the screws and connections to make sure everything is tight.

Conduct a short test drive to ensure everything is working correctly.