AAIRSK X5 20" Fat Tyre Electric Mountain Bike

Key specs at a glance

The Aairsk X5 features a 250 W brushless geared motor that complies with UK road law, reaching a maximum assisted speed of 15.5 mph. Its 48 V 15 Ah lithium-ion battery is removable for convenient indoor charging, taking 5–6 hours to fully recharge. You can expect a range of up to 30 miles on throttle alone or 37 miles using pedal assist, depending on terrain and riding style. The bike rides on 20"×4" fat tyres with front fork suspension, and stops reliably with front and rear mechanical disc brakes.

An LCD display with key and NFC card reader keeps your ride secure, while the 3-speed electronic gearbox helps you tackle gradients up to 30°. The high-strength steel frame measures 65" long, 43" high, with a 28" top tube, and suits riders from 5'1" to 6'3". It weighs 77 lbs and carries up to 440 lbs, making it a sturdy choice for heavy loads. Integrated front lighting with a switch ensures you're seen on dark UK roads.

Smooth and silent power delivery

Enjoy a natural, effortless ride thanks to the 250 W brushless motor, which delivers whisper-quiet acceleration and steady torque. You'll glide away from stops without any jerky surges, and the lack of intrusive noise means you can hear the world around you—perfect for navigating busy UK streets or enjoying peaceful countryside lanes.

Long range with a removable battery

Go the distance with the high-capacity 48 V 15 Ah lithium battery, giving you up to 30 miles on electric power alone or 37 miles with pedal assist on a single charge. Because the battery is removable, you can easily bring it indoors for charging—no need for a garage or outdoor socket, which is a real bonus if you live in a flat or terraced house. Simply unlock it, carry it inside, and you're ready for your next ride.

Conquer sand, snow, and city streets

Ride with confidence across the most challenging surfaces. The 20-inch by 4-inch fat tyres deliver outstanding grip and stability, whether you're tackling loose gravel, soft sand, or wet city roads. A front suspension fork soaks up bumps and vibrations, giving you a smoother, more controlled ride on uneven British terrain.

Stay informed with a smart LCD display

Keep all your key ride stats in view with the intuitive LCD screen. It shows your current speed, battery level, distance travelled, and assist mode in real time, with a high-contrast display that's easy to read even in bright sunlight. The gentle backlight won't dazzle you at night, so you can check your data safely at any hour.

Start your ride with a simple tap of a card or key fob—no fumbling with keys. You can share access cards with family members, making it convenient for everyone. Integrated controls for the front light and horn put safety at your fingertips, especially on dark country lanes or busy city streets after sunset.

Extra cushioning for bumpy British roads

Enjoy a more comfortable ride, even without rear suspension. The thick, high-density foam saddle absorbs shocks and vibrations from potholes, cobblestones, and gravel tracks. It helps smooth out the roughest surfaces, so you arrive feeling fresher after a long day in the saddle.

Reliable stopping power in all weathers

Ride with confidence whatever the British weather throws at you. Unlike traditional rim brakes, the disc brakes perform consistently in rain, mud, and dust. Wet roads won't leave you guessing—your braking remains strong and predictable, keeping you safe on every journey.

Everything you need arrives in one box

Your new e-bike comes with a charger, a tool kit, mounting accessories, and a clear instruction manual. It arrives 90% pre-assembled, so you'll be ready to ride in just 10 to 15 minutes.