Quick Folding Mechanism
Fold the bike easily within seconds.
RCB GK4 Folding Portable City Bike (No electric)
Sale price€351,00Regular price
€399,99
In stock, ready to ship
Enter the discount code at checkout to enjoy RCB's Summer Promotion discounts.
€10
off
Summer Promotion
Use Code:RCB-10
Product Description
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 12.5 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 12.5 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 12.5 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:
The availability and applicability of individual certificates or standards should be confirmed against the documents supplied for the specific product batch.
Features at a Glance
[Folding & Portable Design]
Frame:
High-Strength Aluminum Alloy Frame
Weight:
12.5 kg Lightweight Design
Folding System:
Quick Folding Mechanism
Folded Size:
Compact Design for Easy Storage
Usage:
Car Trunks
[Riding Performance]
Wheel Size:
20-Inch Pneumatic Tires
Gear System:
7-Speed Gear System
Riding Type:
City Commuting
Rider Height:
Approx. 140–190 cm
Maximum Load:
100 kg
[Comfort & Adjustment]
Handlebar:
Adjustable Height Design
Saddle:
Adjustable Seat Height
Riding Position:
Ergonomic Riding Comfort
Tires:
Better Shock Absorption & Stability
[Braking & Safety]
Front Brake:
Mechanical Disc Brake
Rear Brake:
Mechanical Disc Brake
Braking System:
Reliable Stopping Performance
Frame Stability:
Durable Structure for Daily Riding
What’s in the Box?
Garantie und Rückgabe
Up to 24 months warranty and lifetime maintenance service
All accessories can be replaced once within 12 months for free, and free delivery or free return to the factory for repair is provided, without paying postage (battery replacement depends on actual use).
According to time division
1 Return to warehouse for repair
If the fault occurs within 1-12 months, we will give you a return mailing slip to send it back to the repair warehouse for repair, without postage and parts replacement costs.
If the fault occurs more than 12-24 months, we will give you a return mailing slip to send it back to the repair warehouse for repair, and you need to pay for shipping, but you do not need to pay for parts and repair costs.
2 Car replacement service (normal use)
If the fault occurs within 2 months and cannot be repaired. We can directly replace the car. No need to pay for shipping and car cost (0 yuan replacement)
If the fault occurs within 2-6 months and cannot be repaired, you can pay a small amount of shipping to exchange for a new car.
If the fault occurs more than 6-24 months and cannot be repaired, you only need to pay 30%-50% of the car price.
3 Mailing Accessories
We mail accessories to customers, and the accessories will be replaced free of charge within 12 months. No shipping fee is required, and no accessories fee is charged.
We mail accessories to customers, and the accessories will be replaced free of charge within 12-24 months.
Warranty Method
1. We usually choose to replace parts instead of repairs to minimize your waiting time.
2. Parts that meet the warranty conditions described on this page will enjoy a completely free warranty.
3. Parts outside the warranty period can still be repaired/replaced, but a fee is required. For specific fee details, please contact contact@rcb-scooter.com
4. No miscellaneous expenses during the repair period, such as alternative transportation, fuel or carpooling fees, will be charged during the warranty period.
Lifetime Technical Support
1. Our technical experts provide professional help and provide customized solutions for complex problems.
2. One-to-one support: Dedicated support staff will handle all your inquiries, ensuring personalized help throughout the process.
3. This service is available at any time regardless of your warranty status. (Note: After the warranty period, the customer is responsible for the cost of replacing parts.)
Pairs well with
Ships from an EU warehouse. Estimated delivery is 2–4 business days and generally does not exceed 8 business days.
Support 30 Days Of Return
2-Year Warranty
Complimentary shipping
EN 15194 (EPAC) + RoHS
RCB GK4 Folding Portable City Bike (No electric)
Gray / 140cm - 190cm / EU
Sale price€351,00Regular price
€399,99
Slide 1 of 3
Easy Folding Design
Compact folding for daily storage.
Fits Your Lifestyle
Easy storage in cars, apartments and offices.
Lightweight 12.5 kg
Easy to lift and carry anywhere.
Slide 1 of 3
Urban Mobility
Perfect for daily commuting and city rides.
City-Friendly Design
Navigate through busy streets with ease.
Daily Commuting Companion
Designed for work, shopping and short trips.
Slide 1 of 3
Comfortable Riding Position
Enjoy a relaxed riding experience.
Leisure Riding Ready
Perfect for weekend rides and outdoor trips.
For Everyday Adventures
Enjoy flexible riding in different environments.
Slide 1 of 3
Strong Aluminum Frame
Built for durability and stability.
Adjustable Comfort
Find your ideal riding position easily.
20-Inch Pneumatic Tires
Smooth and stable handling.
Slide 1 of 2
Weekend Leisure Rides
Enjoy relaxing outdoor moments.
Versatile Riding
Suitable for city paths and leisure routes.
Ride Anywhere
A practical bike for everyday exploration.
RCB GK4 Size
Size And Fit(Suitable for height:140cm (55.12'')- 190cm(74.8''))
A. Overall length of the bicycle in unfolded state
1490mm(58.66'')
B. Handlebar height adjustment range (vertical distance from the ground to the top of the handlebars)
960mm(37.79'')-1080mm(42.51'')
C. Front wheel diameter
510mm(20'')
D. Wheelbase length
1000mm(39.37'')
E. Minimum pedal height from the ground
120mm(4.72'')
F. Shortest distance from the seat to the bottom bracket
660mm(25.98'')
G. Longest distance from the seat to the bottom bracket
915mm(36.02'')
O. Length of the folding axle in the middle of the frame
560mm(22.05'')
L. Thickness of the folded section of the frame after folding
350mm(13.78'')
N. Overall height of the bicycle in folded state
625mm(24.61'')
M. Overall length of the bicycle in folded state
840mm(33.07'')
H. Handlebar width
570mm(22.44'')
Net weight
12.5KG
Standard load
100KG
Suitable for height(1cm=10mm)
1400mm (55.12'')- 1900mm(74.8'')
Für wen ist dieses Modell geeignet?
Who Is This E-Bike For?
The RCB GK4 is designed for urban commuters, apartment residents and everyday cyclists who need a lightweight, portable and practical bike for modern city life.
Which Riders Is This Folding Bike Suitable For?
-
Urban Commuters
Perfect for daily trips to work, university or city destinations with a compact design that fits busy urban lifestyles.
-
Apartment Residents
The lightweight 12.5kg frame and folding design make it easy to carry upstairs and store in apartments or offices.
-
Multi-Modal Travelers
Easily combine cycling with public transportation, including trains, buses and other daily travel options.
-
Convenience-Focused Riders
Ideal for riders who want a practical bike that is easy to fold, carry and store anywhere.
Recommended Rider Size, Weight & Usage
-
Recommended Rider Height
Suitable for riders approximately 140–190 cm tall with adjustable handlebar and saddle positions.
-
Lightweight & Portable
Weighing only 12.5 kg, the GK4 can be easily lifted, carried and transported when needed.
-
Recommended Usage Areas
Perfect for city roads, bike lanes, commuting routes, parks and weekend leisure rides.
RCB GK4 non-electric folding city bike FAQs
1. How much does the RCB GK4 weigh, and is it easy to carry?
The RCB GK4 weighs only 12.5 kg thanks to its lightweight aluminum alloy frame. Its compact folding design makes it easy to lift, carry upstairs, store in apartments or transport in a car trunk.
2. How quickly can the RCB GK4 be folded?
The RCB GK4 features a quick folding mechanism that allows you to fold the bike easily for storage and transportation. It is ideal for commuters who need a compact bike for trains, offices, apartments or small storage spaces.
3. Is the RCB GK4 suitable for my height?
Yes. The RCB GK4 is designed for a wide range of riders and is suitable for people approximately 140–190 cm tall. The adjustable handlebar and saddle height allow you to find a comfortable riding position.
4. Is the RCB GK4 suitable for daily commuting?
Yes. The RCB GK4 is designed for urban commuting, short trips and leisure rides. With 20-inch pneumatic tires, a 7-speed gear system and front & rear mechanical disc brakes, it provides a comfortable and reliable riding experience for everyday city cycling.