A step-by-step guide based on our official assembly video — works for all S Series models (S, S Pro, and S Competition).Setting up your new NABIIS bike takes just a few minutes and a couple of basic tools. Follow along with the steps below, or watch the full video tutorial [link to YouTube video] for a visual walkthrough of every step.

 

What You'll Need

Everything below is included in your box:

    • 4 mm Allen (hex) key
    • 5 mm Allen (hex) key
    • Open-end wrench (15 mm)
    • Cross-head screwdriver
    • Bike pump
    • Reflectors
    • Bell
    • Pedals (marked L / R)
    • Owner's manual

Before you start: unpack your bike carefully and lay down a soft surface (a blanket, cardboard, or rug) to avoid scratching the frame or your floor while you work.

Step 1: Install the Handlebar

    1. Rotate the front fork 180° so the stem and front brake caliper are facing forward.
    2. Using the 4 mm Allen key, remove the faceplate bolts and take the faceplate off.
    3. Position the handlebar so the green brake lever sits on the right side from the rider's perspective, with both brake levers tilted downward at approximately 35°.
    4. Place the faceplate back on and thread all four bolts in by hand first.
    5. Using the 4 mm hex key, tighten the four clamp bolts — but don't fully tighten one bolt at a time. Rotate each bolt just a little in a criss-cross pattern until they're evenly and firmly secured.

 

💡 Tip: Tightening bolts evenly (a little at a time, alternating between them) keeps the faceplate aligned and prevents uneven pressure on the stem.

 

Step 2: Install the Front Wheel

    1. Pop off the plastic protective caps on the front axle.
    2. Make sure the tread direction on the front tire matches the rear tire.
    3. Drop the front wheel axle into the fork dropouts.
    4. Hand-tighten both axle bolts (about two to three turns) until the wheel is snug and centered.
    5. Slot the brake noodle back into the brake arm cradle, and give the lever a squeeze to confirm the front brake operates smoothly.

Step 3: Install the Pedals

⚠️ Please note: the left and right pedals thread in opposite directions.

    • Right (R) pedal: turn clockwise to tighten
    • Left (L) pedal: turn counterclockwise to tighten
    1. Take the right pedal (marked R) and thread it into the right crank arm by hand, then secure it firmly with the 15 mm open-end wrench.
    2. Take the left pedal (marked L) and thread it into the left crank arm by hand — remember, this one tightens counterclockwise — then secure with the wrench.

Step 4: Attach the Bell

    1. Loosen the bell's clamp screw with the 5 mm Allen key.
    2. Position the bell near the handlebar grip, next to the brake lever.
    3. Tighten the screw with the 5 mm Allen key to secure it in place.
    4. Flick the lever to make sure it rings well.

Step 5: Final Adjustments

    1. Adjust the saddle to the proper height for your child (see our [Sizing Guide] if you're not sure what height to start at).
    2. If needed, you can fine-tune the seat clamp by turning the thumb nut on the other side.
    3. Check your tire pressure with the included pump and inflate to the recommended PSI [see tire pressure chart].
    4. Give the bike a final once-over — spin both wheels, squeeze both brakes, and rock the handlebar — to make sure everything's running smooth before your child's first ride.

That's It — Time to Ride!

Your NABIIS S Series bike is now fully assembled and ready to go. If you run into any issues along the way, check out our full video tutorial [link], or reach out to our support team at service@nabiis.com — we're happy to help.

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