DocGREEEN GRUNDIG 20 Folding 36V/250W

⚙️ Specifications

Type: Folding electric city bike, 20″

Motor: GRUNDIG 36V 250W rear hub motor with 30Nm torque

Battery: Samsung 36V 7Ah (252Wh), removable, integrated into the frame

Range: Up to 40–50 km depending on assistance level and riding conditions

Charging time: Around 3.5 hours with 2A charger

Gears: 7-speed Shimano with twist shifter

Brakes: TEKTRO mechanical disc brakes front and rear (160mm rotors)

Tires: CST 20″ x 1.75″

Frame: Aluminum, foldable with collapsible handlebar and pedals

Weight: Approx. 21 kg

Dimensions: 152 x 56 x 102 cm (fully unfolded)

Max rider weight: Up to 140 kg

Rider height suitability: 1.40 m to 1.85 m

Lights: Front and rear battery-powered LED lights

Display: LCD with 5 levels of pedal assist

Extras: Rear rack, front and rear mudguards, ergonomic saddle

A 2-year warranty is provided.

✅ Key Advantages
Easy folding for compact storage or car transport

Reliable motor with responsive performance for city commuting

Lightweight and agile – suitable for public transport use

Removable battery for convenient charging

2-year warranty on the bike and battery