Product Highlights
5-8 years
3'9" – 4'9"
< 10 minutes from box to ride
NABIIS - S4 Pro
The Nabiis S4 is one of the world’s lightest 20-inch kids' bikes, weighing only 7kg. It makes for a perfect first pedal bike for kids 6 and up.
Featuring a German Continental® Belt Drive System that replaces oily chains with a silent, maintenance-free solution. It offers a smoother, quieter, and more efficient ride compared to traditional chain bikesWhether it’s a weekend park ride or a neighborhood sprint, the S4 delivers a responsive, agile, and fatigue-free experience.
Best With
Fast Delivery
365 days warrantty
Free Returens
30 days money back
Size Info
Wheel Size: 20 in
Ideal Child Height: 3'9" - 4'9" （115 - 145cm）
Age Range: 6-8
Min. Leg Length: 21.8 in
Wheelbase: 31.6 in / 801.6 mm
Handlebar Height: 28.3"
Q Factor: 145mm
We highly recommend you using our Bike Finder tool. It’s an interactive tool we built specifically for our bikes to help you choose the perfect size for your kid based on their height and age.
Measurements
Weight: 15.0 lbs (6.8 kg)
Minimum Saddle Height: 23.2 in
Maximum Saddle Height: 27.6 in
Gain Ratio: Belt, 48T/22t
Max Tire Width: 1.95 in
Product Highlights
5-8 years
3'9" – 4'9"
< 10 minutes from box to ride
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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Refund Policy
We want to make sure the bike is perfect for your child, so you can always return or exchange your bike for up to 30 days after delivery.
You can visit our FAQ page for more detailed refund policy -
Warranty up to 5 Years
We have full confidence in our bikes, which is why we offer a 5-year warranty on the aluminum frames and forks.
Ohter spare parts and repairs are covered within the first 1-3 year of purchase. You can visit our FAQ page for more info
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Contact Us
If you have a question about a new bike, an existing order, or need help with technical troubleshooting, our team of bike experts is ready to help you navigate every turn.
Email us: service@nabiis.com. We will replay you within 24 hours on weekdays.Find your fit: Use our Online Bike Finder to get a bike recommendation based on your child’s height and riding style.
Drop us a line: Use the form on our contact page for more specific inquiries
Nabiis LR³ System
This is the product technology of Nabiis.Professional-grade bikes built for growing riders.
Nabiis BioMap™
Kids aren't small adults. Their bikes shouldn't be, either.
Nabiis Air-5D™
We've tuned every touchpoint to make lightness an instinct, not just a measurement.
Professionally Assembled
Every bike is precision-tuned before it ever leaves our doors.
S Series · Pro · Ultralight Performance
6061 Lightweight Aluminum Frame
At just 5.6 kg, the 16-inch bike is easy for young riders to lift, handle, and control.Less weight means easier control, giving young riders a smoother, more confident start.
Continental Belt Drive
Race-proven drivetrain technology, engineered for growing riders. Lighter than the S Series system, the Continental belt drive reduces pedaling effort for a smoother, easier ride.Grease-free, low-maintenance, and built to last, it keeps everyday riding cleaner for kids and makes bike care simpler for parents.
Short-Reach Brake Levers
Tuned specifically for small hands, the short-reach brake levers are easy to grip and operate, giving young riders greater confidence and control.
Ultralight Dual V-Brakes
Front and rear V-brakes are precision-tuned by experienced technicians for smooth, responsive braking with minimal hand effort.
Nabiis Custom Green Rear Brake
A simple color cue for safer braking. The green rear brake helps young riders quickly identify which brake to use, making safe braking habits easier to learn and remember.
145 mm Q-Factor
Not a scaled-down adult bike. Not a one-size-fits-all approach.With a Q-factor of just 140 mm, the 16-inch S Series is designed around a child’s natural pedaling position, helping keep the hips, knees, and ankles properly aligned for a more comfortable and efficient pedal stroke.
Precision, Engineered for Growing Bodies
A bottom bracket height of 196mm creates a lower center of gravity for greater stability and control at slower speeds.The geometry also allows young riders to place both feet firmly on the ground when needed, without compromising a natural riding position.
Optimized RC Geometry
Light to ride. Quick to respond.A precisely tuned rear-center length helps maximize power transfer, turning each pedal stroke into smooth, immediate forward motion.
The Perfect Grip
Smaller-diameter handlebars, stem, and grips are designed to fit young riders’ hands naturally, creating a secure and comfortable grip with less effort.The result is confident control of the bike, without having to over-grip the bars.
Thoughtful Down to the Details
CST Reinforced All-Terrain Tires
Designed for confident riding across a variety of surfaces, with added grip and stability for a smoother ride.
Cushioned Kids’ Saddle
Extra padding provides greater comfort and support, keeping young riders comfortable on every ride.
