ROCKBROS MBS Aluminum Folding Bike 20 Inch
- Wheel Size: 20 inches
- Size: 20 Inches
- Minimum User Height: 55.1 inches
- Maximum Weight Recommendation: 220 pounds
Last refreshed Jun 21, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A light, fast-folding commuter bike aimed at riders who need portability more than performance, with an 8-speed drivetrain that covers most city terrain.
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ASIN: B0FV3LCD9LCategory: Folding Bikes
Overview
This ROCKBROS MBS folding bike uses a 20 inch wheel and an aluminum frame that brings weight down to about 25 lb, roughly 30 to 40 percent lighter than a comparable steel frame. It folds to about 31.5 x 27.6 x 14.6 inches for transit or storage.
Shimano's 8-speed drivetrain handles gear changes while front and rear V-brakes provide the stopping power. Rockbros built the frame for a wide range of riders, from 4'7 to 6'1, with a 220 lb weight limit, and an ergonomic saddle plus a latch that keeps the folded bike compact.
- 25 lb aluminum alloy frame
- Shimano 8-speed drivetrain
- Folds to 31.49 x 27.56 x 14.57 inches
- Fits riders 4'7 to 6'1, up to 220 lb
Who it's for
Fits commuters who need to carry a bike onto a subway, bus or into a car trunk on a regular basis, and riders who want a light frame without stepping up to a premium price point. Less suited to anyone planning off-road or high-speed riding, since this is a compact commuter build.
Pros and cons
- Aluminum frame keeps weight near 25 pounds
- Folds in seconds for transit or storage
- Shimano 8-speed handles hills and slopes
- Fits a wide rider range, 4'7 to 6'1
- No stated rack or cargo capacity
Performance notes
The aluminum frame and high-carbon steel fork combine to keep weight low while the fork adds stiffness, and Rockbros lists a corrosion-resistant aluminum crankset under the paint. Shimano's 8-speed shifting gives enough range for rolling city streets, and the V-brakes on both wheels handle everyday stopping.
Specifications
| Brand | Rockbros |
|---|---|
| Dimensions & fit | |
| Wheel Size | 20 inches |
| Size | 20 Inches |
| Minimum User Height | 55.1 incheslower than 90% of 22 folding bikes |
| Maximum Weight Recommendation | 220 poundslower than 76% of 34 folding bikes |
| Capacity & performance | |
| Number Of Speeds | 8 |
| Bicycle Drivetrain Type | Chain Drive |
| Age Range Description | Adult |
| Power & efficiency | |
| Power Source | Pedal |
| Construction & materials | |
| Frame Material Type | Aluminum |
| Color | Green |
| Other details | |
| Brake Style | V Brake |
| Suspension Type | Rigid |
| Bike Type | Folding Bike |
| Intended Riding Terrain | Paved Roads |
| Additional Features | Foldable |
Closest rivals on specs
Frequently asked questions
How much does the ROCKBROS MBS folding bike weigh?
About 24.96 lb thanks to the aluminum alloy frame, roughly 30 to 40 percent lighter than a steel-frame equivalent.
What size folded footprint does it have?
It folds to approximately 31.49 x 27.56 x 14.57 inches, sized to fit a car trunk or a storage closet.
What drivetrain and brakes does it use?
A Shimano 8-speed gear system paired with front and rear V-brakes.