QNUT BK20 Fat Tire Electric Bike 48V 18A 1500W 28MPH UL2849 Certified

We currently offer free shipping to all U.S. states, excluding Hawaii, Alaska, and Puerto Rico.

In-stock orders are generally shipped within 2 business days, unless otherwise noted on the product page. Once shipped, orders typically arrive within 2–7 business days. ( We CAN NOT ship to PO BOXES or APO.) 

In rare cases where an order cannot be shipped within 5 business days, we will notify you promptly.

We offer a 14-day return window, allowing you to request a return within 14 days after receiving your order.
For more details, please visit our Refund Policy.

All scooters/bikes come with a 1-year manufacturer's warranty for the original owner, covering manufacturing defects. 

This warranty does not cover damage caused by accidents, water exposure, or misuse.

For full details, please visit our Warranty Page

UL2849 Certified E-Bike refers to an electric bike that has passed UL 2849 safety standards, covering the electrical drive train system—including battery, charger, and motor. This certification ensures protection against fire, electric shock, and other hazards, making the e-bike compliant with North American safety regulations. 

The HR-BK20 model, marketed under the brands RONZLLA, Rooder, QNUT, and HAPPYRUN, successfully passed UL 2849 safety standards on Feb 12th, 2026. This certification confirms that the e-bike's entire electrical system (battery, charger, and motor) meets rigorous North American requirements for protection against fire, electric shock, and other potential hazards.

We supply a full range of reliable e-bike spare parts—from frames, forks, and hub motors to batteries, controllers, displays, brakes, sensors, wheels, and all essential components listed below.

With comprehensive after-sales support, we ensure quick sourcing, compatibility, and long-term availability. Order with confidence—your worry‑free after‑service is our promise.

Parts we offer:

• Frame 

• Rigid Fork

• Front & Rear Wheels

• Hub Motor

• Lithium-Ion Battery

• Standard eBike Controller

• LCD/LED Display

• Thumb/Twist Throttle

• Magnetic PAS

• Brake Levers (cutoff switch)

• Mechanical Disc Brakes (set)

• Rear Derailleur, Cassette, Chain, Shift Lever

• Bottom Bracket, Crankset, Pedals

• Seatpost, Saddle, Handlebars, Grips

• Headset, Stem

• Front & Rear LED Lights

• Full Fenders, Kickstand, Wiring Harness

Your reliable partner for quality spares & peace of mind.

Electric Bike BK20 Local Warehouse in USA

GA001 (US East Warehouse Address)
Contact: Big Max LLC
Warehouse Address: 320 Morgan Lakes Industrial Blvd. Unit D04, Pooler GA. 31322
Working Hours: Monday to Friday; 9 AM - 5 PM

GA001 Ebike - We Are Near You:

CA002 Warehouse (US West Warehouse Address)
Contact: Mary-1059
Address: 9448 Richmond Pl unit B Rancho Cucamonga CA 91730
Working Hours: 09:00 - 17:00, Monday to Friday

CA002 Best E-Bike for Sale - We Are Near You:

After-Sale Service Address in USA

CA002 Warehouse (US West)
Contact: Mary—1033
Address: 9448 Richmond Pl unit B Rancho Cucamonga CA 91730
Working Hours: 09:00—17:00, Monday to Friday

GA001 Warehouse (US East)
Contact: Big Max LLC—1033
Warehouse Address: 320 Morgan Lakes Industrial Blvd. Unit D04, Pooler GA. 31322
Working Hours: Monday to Friday; 9 AM - 5 PM

More Details

We're happy to help! If you have any questions about our products or services, please reach out to us at:

Email: rooder@ronzlla.com