EUROBIKE OBK G4/G6 26" Full Suspension Folding Mountain Bike 21 Speed Bicycle Men or…
- Mountain Bike
- 27.5 inches
- 300 pounds
- Pedal
- More reviewed than 73%
A solidly built folding mountain bike for the price, with smooth shifting and working suspension, as long as you're prepared to finish assembly and swap the seat.
As an Amazon Associate, ProductDome may earn a commission from qualifying purchases made through links on this page.
How it ranks among the 95 mountain bikes we track
4.1★ across 169 Amazon ratings, Bayesian-smoothed toward the category average.
169 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 95 mountain bikes we track - how the scorecard works · full mountain bikes data report. Confidence: medium - useful but incomplete evidence.Last refreshed Jun 21, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The OBK G4/G6 is a 26/27.5 inch folding mountain bike with front and rear suspension and a 21-speed Shimano 3x7 drivetrain. It hinges down for storage in a car trunk or closet and is built for men and women riders.
- Wheel size listed as both 26 and 27.5 inch across the listing
- 3-spoke aluminum mag wheels
- Unisex frame geometry sized for men and women
- Ships partially disassembled with tools included
Who it's for
Suited to casual trail and street riders who want a folding bike under about $300 and don't mind basic assembly. Not a fit for anyone chasing a lightweight race bike or expecting showroom-ready assembly out of the box.
What buyers say
From Amazon customer reviews.
Buyers consistently praise the smooth Shimano derailleurs, strong disc brakes, and working suspension on rough terrain, with several logging 10-plus mile rides on street and off road. The stock seat draws repeated complaints as too hard, and a few units arrived with a wobbly rear wheel, a faulty handlebar grip, or a folding mechanism one buyer called difficult to close. Multiple reviewers highlight that the seller's customer service replaced defective parts quickly at no cost.
Strengths and trade-offs
Drawn from this product's published specifications.
- Smooth-shifting 21-speed Shimano drivetrain
- Front and rear suspension soaks up rough terrain
- Disc brakes with strong stopping power
- Folds down for trunk or closet storage
- Stock seat is hard on longer rides
- Folding mechanism can be stiff on some units
- Heavier than a non-suspension folding bike
- Requires assembly; some parts arrive misaligned
Specifications
| Brand | Eurobike |
|---|---|
| Model | G4/G6 |
| Dimensions & fit | |
| Wheel Size | 27.5 inches |
| Maximum Weight Recommendation | 300 pounds |
| Item Weight | 40 pounds |
| Size | 27.5 inches |
| Minimum User Height | 66.9 inches |
| Capacity & performance | |
| Bicycle Gear Shifter Type | Trigger |
| Bicycle Drivetrain Type | chain drive |
| Number Of Speeds | 21 |
| Age Range Description | Adult |
| Power & efficiency | |
| Power Source | Pedal |
| Construction & materials | |
| Frame Material Type | Alloy Steel |
| Wheel Material | Magnesium Alloy |
| Color | 27.5 wheels Green |
| Included components | |
| Unit Count | 1 |
| Included Components | Kickstand |
| Warranty & support | |
| Warranty Type | Limited |
| Other details | |
| Suspension Type | Dual |
| Bike Type | Folding Bike, Mountain Bike |
| Is Assembly Required | Yes |
| Brake Style | Disc |
| Additional Features | 21 speed, Foldable, mountain bike |
| Specific Uses For Product | Gravel |
| Derailleur Configuration | Front and Rear |
| Intended Riding Terrain | Mountain Terrain, Unpaved Trails |
Other Eurobike mountain bikes
How it compares
This product against the closest alternatives we track in mountain bikes.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| EUROBIKE OBK G4/G6 26" Full Suspension Folding Mountain Bike 21 Speed Bicycle Men or…This product | 4.1 / 5 | 169 | 3.7 / 5 |
| Mongoose Dolomite Fat Tire Mountain Bike | 4.4 / 5 | 2,281 | 4.1 / 5 |
| Mongoose Malus Mens and Women Fat Tire Mountain BikeBrand | 4.4 / 5 | 1,500 | 4.1 / 5 |
| Schwinn Bonafide Men and Women Mountain BikeSchwinn | 4.2 / 5 | 667 | 4.1 / 5 |
| WEIZE Mountain Bike, 24 26 27.5 inch Outdoor MTB Bicycle, 6/18-Speed High-Carbon Steel…Weize | 4.1 / 5 | 599 | 4.0 / 5 |
Similar mountain bikes from other brands
Questions about the Eurobike G4/G6
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
Does the Eurobike OBK G4/G6 fold down small enough for a car trunk?
Yes, reviewers confirm it folds and fits into car trunks and even a closet, though one buyer found the hinge stiff to fold on their unit.
How many speeds does the OBK G4/G6 have?
It runs a 21-speed Shimano 3x7 setup with a front and rear derailleur, which reviewers describe as shifting smoothly out of the box.
Is assembly required for the Eurobike G4/G6?
Yes, it ships in parts with the needed tools included, and reviewers report assembly time from about 30 minutes to two hours depending on experience.