1. Introdución
Thank you for choosing the Fafrees FF20 Polar 20-inch Folding Electric Bicycle. This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your e-bike. Please read this manual thoroughly before your first ride and keep it for future reference.

Figure 1.1: Fafrees FF20 Polar 20-inch Folding Electric Bicycle (Red)
The Fafrees FF20 Polar is a versatile folding electric bicycle designed for urban commuting and off-road adventures. It features a powerful motor, dual long-endurance batteries, fat tires for various terrains, and a convenient foldable design for easy storage and transport.
2. Información de seguridade
Your safety is paramount. Always adhere to local traffic laws and regulations. Failure to follow these safety guidelines may result in serious injury or property damage.
- Usa sempre casco e equipamento de seguridade axeitado cando conduzas.
- Realiza unha inspección previa á condución antes de cada uso, comprobando os freos, os pneumáticos e o nivel da batería.
- Non conduza baixo a influencia do alcol ou das drogas.
- Ten coidado co teu contorno e cos demais usuarios da estrada.
- Avoid riding in adverse weather conditions, such as heavy rain or snow, if possible.
- Asegúrese de que os mecanismos de pregamento estean ben bloqueados antes de montar en bicicleta.
- Non exceda a capacidade de carga máxima de 150 kg.
3. Compoñentes Overview
Familiarize yourself with the main components of your Fafrees FF20 Polar e-bike.

Figura 3.1: Lateral view of the Fafrees FF20 Polar electric bicycle, showing its full profile.
3.1. Dual Battery System

Figure 3.2: Diagram illustrating the dual battery system (48V 20.8Ah total) with main and second batteries, and battery management system (BMS). The dual battery equalizer reduces the current intensity of each battery, increasing its lifespan and mileage.
3.2. Dual Disc Brakes

Figure 3.3: Diagram showing the dual disc brake system on the Fafrees FF20 Polar, highlighting the power-off brake function for enhanced safety.
3.3. Sistema de iluminación

Figure 3.4: Image demonstrating the super bright 15W front and 5W rear lights of the e-bike, essential for night riding visibility.
3.4. CHAOYANG 20x4.0 Fat Tires

Figure 3.5: Close-up of the CHAOYANG 20x4.0 fat tires, designed with stronger friction to adapt to various riding environments including snow, sand, mud, gravel, and flat terrain.
3.5. Color LCD Display

Figure 3.6: Image of the color LCD screen displaying key metrics such as power, speed, riding mode, trip distance, and total distance. Features include automatic cruise control (activates after 8 seconds of fixed speed) and Walk Assist Mode.
4. Configuración e montaxe inicial
Your Fafrees FF20 Polar e-bike comes mostly pre-assembled. Follow these steps for final assembly and preparation for your first ride.
- Desembalaxe: Carefully remove the e-bike and all components from the packaging. Retain the packaging for potential future transport or returns.
- Instalación de manillar: Unfold the handlebar stem and secure it in the upright position. Adjust the handlebar height and angle for comfortable riding.
- Instalación de pedal: Identify the left (L) and right (R) pedals. Screw them into the crank arms. Note that the left pedal has a reverse thread. Tighten securely.
- Instalación da tija do asento: Insert the seat post into the frame and adjust the height to your preference. Ensure the quick-release lever is securely tightened.
- Carga da batería: Fully charge both batteries before your first ride. Connect the charger to the battery charging port and then to a power outlet. The indicator light on the charger will change when fully charged.
- Inflado dos pneumáticos: Check and inflate tires to the recommended pressure (refer to tire sidewall or specifications section).
- Inspección previa á marcha: Before every ride, check that all bolts and quick releases are tight, brakes are functioning correctly, tires are properly inflated, and the battery is sufficiently charged.
5. Instrucións de funcionamento
5.1. Acendido/apagado
- To power on the e-bike, press and hold the power button on the LCD display.
- Para apagar, manteña premido o botón de acendido de novo ata que a pantalla se apague.
5.2. Modos de conducción
The Fafrees FF20 Polar offers three riding modes:
- Modo de asistencia ao pedaleo (PAS): Provides electric assistance as you pedal. Adjust the assist level using the '+' and '-' buttons on the display.
- Modo eléctrico: Use the throttle to propel the bike without pedaling.
- Modo manual: Anda en bicicleta coma se fose unha bicicleta tradicional sen asistencia eléctrica.
5.3. Cambio de marchas
The e-bike is equipped with a 7-speed gear system. Use the shifter on the handlebar to change gears according to terrain and desired speed.
5.4. Freada
The e-bike features dual mechanical disc brakes. Squeeze the brake levers on the handlebar to engage the brakes. The power-off brake function will cut motor power when braking.
5.5. Dobrar e Desdobrar
The quick-folding design allows for easy transport and storage.

Figure 5.1: Visual guide on the quick folding design, showing two steps: Step 1: Fold the frame. Step 2: Fold the handlebar. The bike can then be easily transported, for example, in a car trunk.
6. Mantemento
Regular maintenance ensures the longevity and optimal performance of your e-bike.
- Coidado da batería: Store batteries in a cool, dry place. Charge regularly, even if not in use, to maintain battery health. Avoid fully discharging the battery.
- Presión dos pneumáticos: Check tire pressure weekly and inflate to the recommended PSI.
- Inspección de freos: Regularly check brake pads for wear and brake cables for tension. Adjust or replace as needed.
- Lubricación da cadea: Manteña a cadea limpa e lubricada para garantir cambios de marcha suaves e evitar a oxidación.
- Limpeza xeral: Limpar a bicicleta regularmente con anunciosamp pano. Evite usar chorros de auga a alta presión directamente sobre os compoñentes eléctricos.
- Comprobación de fixación: Comprobe periodicamente que todos os parafusos, porcas e peches rápidos estean ben axustados.
7 Solución de problemas
This section addresses common issues you might encounter with your Fafrees FF20 Polar e-bike.
| Problema | Causa posible | Solución |
|---|---|---|
| E-bike does not power on. | Batería non cargada ou non instalada correctamente. | Ensure batteries are fully charged and securely inserted. Check connections. |
| O motor non presta asistencia. | PAS level too low, throttle issue, or brake lever engaged. | Increase PAS level on display. Check throttle connection. Ensure brake levers are not squeezed. |
| Curta autonomía da batería. | Under-inflated tires, heavy load, frequent use of high assist levels, or cold weather. | Inflate tires to recommended pressure. Reduce load. Use lower assist levels. Battery performance may decrease in cold weather. |
| Os freos parecen débiles. | Worn brake pads or loose brake cables. | Inspect brake pads for wear and replace if necessary. Adjust brake cable tension. |
| Ruídos pouco comúns durante a condución. | Loose components, dry chain, or misaligned gears. | Check all fasteners for tightness. Lubricate the chain. Adjust gear derailleur if needed. |
If you encounter issues not listed here or require further assistance, please contact Fafrees customer support.
8. Especificacións
Key technical specifications for the Fafrees FF20 Polar electric bicycle:
| Característica | Especificación |
|---|---|
| Número de modelo | FF20 POLAR |
| Tipo de bicicleta | Bicicleta eléctrica plegable |
| Material do marco | Aluminio |
| Tamaño da roda | 20 polgadas |
| Tamaño do pneumático | 20 x 4.0 inches (Fat Tires) |
| Capacidade da batería | Dual 48V (20.8Ah / 24Ah / 26.8Ah total options) |
| Range (Electric Assist) | Up to 130km / 150km / 170km (depending on battery option) |
| Par motor | 65 Nm |
| Freos | Freos de disco mecánicos |
| Número de velocidades | 7 |
| Suspensión | Full Suspension (Front Suspension Fork) |
| Dimensións do produto (L x W x H) | 179 x 121 x 68 cm |
| Peso neto do produto | 24 kg (product listing) / 34 kg (specifications listing) - Note: Discrepancy in source data. |
| Capacidade de carga máxima | 150 kg |
| Características especiais | Digital Display, Taillight, Mudguard, Foldable, Multiple Speeds |
| Compoñentes incluídos | Mudguard, Mirror, Tool Kit |
9. Garantía e soporte
Fafrees E-Bike was created in 2020 with a commitment to providing high-quality and affordable electric bicycles. They aim to offer stable, fast, and dedicated logistics services.
For any questions, technical support, or warranty claims, please contact the seller directly through Amazon. The seller for this product is Fafrees_Ebikes.
When contacting support, please have your product's serial number ready. It is recommended to fully charge the battery before your first ride and to check the packaging upon receipt.
Fafrees offers a professional team with 5 years of experience, providing quick responses 24/7.





