Mountain bike chain drive with shock absorption, unidirectional wheel.

Let's assemble it together.

First, we need to prepare 1 M3*22 countersunk screw, 1 M3*25 countersunk screw, 1 M3*5 countersunk screw, 2 M3*18 countersunk screws, and 2 springs. The springs are taken from a lighter's electronics.

Prepare these components. Note that the rear and front wheels are different.

Install the rear wheel sprocket onto the rear tire.

Install the M3*22 countersunk screw.

Insert the sprocket spacer.

Install the rear wheel, ensuring the screws are properly secured.

Finished installation, ensure the tire rotates smoothly.

Locate these parts, including 1 M3*25 countersunk screw.

Install the screw from one of the small parts to the bottom.

Insert the front wheel tire.

Install the other small part. Ensure the tire rotates smoothly.

Install the shock absorber inner tube.

Installation result.

Connect the tire to the shock absorber; if loose, add a drop of glue.

Install the shock absorber spring.

The other spring.

Two spring stoppers; note that one stopper is slightly thicker. Place the thicker one on the outside.

Press into place.

Install into the frame.

Install the handlebars; add a drop of glue if loose.

Locate the large sprocket, the pedal parts, and 2 M3*18 countersunk screws.

Install the bottom bracket and sprocket; note the sprocket orientation.

One pedal arm. Note that the two pedal arms are different; choose the slightly thinner one for this side.

Insert into the frame and install the other pedal arm. Add a drop of glue if loose.

Two pedals.

Finished installation.

Locate the pedal bracket and M3*5 countersunk screw.

Install the pedals.

Seat assembly.

Now, install the chain.

Locate the printed chain parts.

Assemble.

Total 17 sections.

Iron at 180 degrees. Do not link into a loop yet.

After installation, iron the last section with a soldering iron.

The bicycle is now complete.