RCB GK4 Folding Portable City Bike (No electric)

RCB GK4 Lightweight 20-Inch Folding City Bike

The RCB GK4 is a lightweight 20-inch folding city bike designed for urban commuting, short-distance travel, public transport connections and weekend leisure rides.

Weighing only 12.8 kg, it can be folded quickly for convenient storage in a car boot, apartment, office or other limited space. With an adjustable handlebar and seat, a 7-speed drivetrain, dual disc brakes and durable pneumatic tyres, the GK4 provides a practical and comfortable riding experience for teenagers and adults.

Why Choose the RCB GK4?

Lightweight 12.8 kg aluminium folding bike

Compact folded size for transport and storage

Suitable for riders approximately 140–190 cm tall

Smooth and versatile 7-speed gear system

Front and rear mechanical disc brakes

Durable 20-inch pneumatic tyres

Maximum recommended load of 100 kg

Bike lock, tyre pump and tool kit included

Lightweight and Compact Folding Design

At only 12.8 kg net weight, the RCB GK4 is easy to carry, lift and transport. Its quick-folding frame reduces the bike to a compact size of approximately 840 × 350 × 625 mm, making it suitable for:

Car boots

Apartments and small storage spaces

Offices and workplaces

Motorhomes and holiday travel

Train and public transport journeys

When unfolded, the bike measures approximately 1490 × 570 × 1080 mm, providing a stable riding position while remaining compact enough for busy urban environments.

Whether you need a bike for the last part of your daily commute or a portable bicycle for weekend trips, the GK4 fits easily into an active city lifestyle.

Adjustable for Teenagers and Adults

The RCB GK4 can be adjusted to accommodate different rider heights and preferred riding positions.

The telescopic handlebar adjusts from approximately 960 mm to 1105 mm, while the seat height can be adjusted from approximately 660 mm to 915 mm.

This flexible design makes the bike suitable for riders approximately 140–190 cm tall and for users aged 12 years and above, subject to individual riding ability and local regulations.

The adjustable riding position helps improve comfort, control and pedalling efficiency during everyday journeys.

Smooth 7-Speed Gear System

The GK4 features a reliable 7-speed drivetrain, allowing riders to select the appropriate gear for different riding conditions.

Lower gears provide easier pedalling when starting or riding on gentle inclines, while higher gears are suitable for maintaining speed on flat roads. The gear system makes the bike practical for:

Daily commuting

City streets

Cycle paths

Park routes

Gentle slopes

Short leisure rides

Smooth gear changes help create a more comfortable and efficient riding experience without making the bike complicated to operate.

20-Inch Pneumatic Tyres with Aluminium Rims

The 20-inch wear-resistant pneumatic tyres provide reliable grip and cushioning on everyday urban surfaces.

Combined with lightweight aluminium alloy rims, the tyres help maintain stable handling on paved roads, cycle lanes and slightly uneven surfaces. Their compact size also supports the bike’s portable folding design without sacrificing everyday riding comfort.

The pedals sit approximately 120 mm above the ground at their lowest point, helping riders maintain suitable ground clearance when passing over common road irregularities.

Dual Disc Brakes for Reliable Control

For dependable braking performance, the RCB GK4 is equipped with front and rear mechanical disc brakes.

The two-brake system provides controlled stopping power during daily commuting and leisure riding. Front and rear reflectors also help improve visibility in low-light conditions.

For riding on public roads, users should always check that the bicycle is equipped according to the traffic and lighting regulations of their country or region.

Durable Aluminium Alloy Frame

The folding frame is manufactured from welded and painted aluminium alloy, combining low weight with the strength required for regular use.

The bike supports a maximum recommended load of 100 kg, including the rider and any safely secured light luggage.

Its neutral grey and purple finish gives the GK4 a clean and versatile appearance suitable for commuting, travel and everyday recreational use.

Product Compliance and Documentation

Product documentation supplied for the RCB GK4 references the following regulations, directives and testing standards, where applicable:

Regulation (EU) 2023/988 on General Product Safety

EU RoHS Directive

CE-related product documentation

Directive 2006/42/EC documentation

EN 14764 test documentation

Equipment intended to support applicable German StVZO requirements

For advance access to available electronic compliance documents, declarations or test reports, please contact:

contact@rcb-scooter.com

The availability and applicability of individual certificates or standards should be confirmed against the documents supplied for the specific product batch.