Gotrax 16" Folding Electric Bike
- Electric Bicycle
- 16 inches
- 264 pounds
- 281 Wh
- More reviewed than 98%
A capable short-range folding commuter, with real-world assembly times from 15 minutes to about an hour depending on experience. Best treated as a neighborhood runabout rather than a touring e-bike.
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How it ranks among the 478 electric bicycles we track
4.4★ across 555 Amazon ratings, Bayesian-smoothed toward the category average.
555 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 478 electric bicycles we track - how the scorecard works · full electric bicycles 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
A 16-inch folding electric bike with a 350W motor, removable 280.8Wh battery, and three ride modes (pure electric, pedal-assist, manual). Suited to short commutes, errands, and riders who need a bike that folds down for a car trunk or closet.
The bike carries UL2849 safety certification and includes dual disc brakes and front suspension, with a height-adjustable seat and handlebar so it can be shared between household members of different heights. The listing states 350W in the spec bullets against a Peak 500W claim in the title; treat 350W as the sustained rating and the higher figure as a short burst number.
- 350W motor, 15.5 mph top speed
- 280.8Wh removable battery
- 16-inch tires with front shock absorber
- Foldable frame for storage
Who it's for
Fits commuters covering a few miles at a time on mostly flat ground, and households that want one bike two people can share thanks to the adjustable seat and bars. Riders wanting long-range touring or hill climbing will find the 15.5 mph top speed and 15.5-mile pure-electric range limiting.
What buyers say
From Amazon customer reviews.
Buyers consistently praised the quick assembly (15 minutes to under an hour), sensitive throttle response, and comfortable adjustable seating for riders of different heights, including a parent and teenager sharing one bike. The main complaint was that the folded bike is more cumbersome to carry than expected, and one owner wasn't confident in the battery gauge's accuracy after a full charge showed no drop following an hour-long ride.
Strengths and trade-offs
Drawn from this product's published specifications.
- Folds for storage in a trunk or closet
- Height-adjustable seat and handlebar fit multiple riders
- Dual disc brakes and front suspension for stability
- 365-day parts coverage plus responsive support
- Folded shape is bulkier to carry than expected
- 15.5 mph top speed limits it to short trips
- Battery gauge accuracy questioned by at least one owner
Performance notes
Power comes from a 350W brushless hub motor paired with a 280.8Wh removable battery, delivering roughly 15.5 miles on pure electric power or up to 28 miles when pedal-assist stretches the charge. Dual disc brakes and a front shock absorber handle stopping and small bumps, and a three-mode switch lets a rider choose pure electric, pedal-assist, or standard pedaling.
Specifications
| Brand | Brand |
|---|---|
| Model | S4 Black |
| Dimensions & fit | |
| Wheel Size | 16 inches |
| Maximum Weight Recommendation | 264 pounds |
| Capacity & performance | |
| Number Of Speeds | 1 |
| Age Range Description | Adult |
| Power & efficiency | |
| Lithium Battery Energy Content | 281 Wh |
| Power Source | Electric motor |
| Construction & materials | |
| Frame Material Type | Alloy Steel |
| Color | Black |
| Included components | |
| Included Components | Battery, Charger, Electric Bike, Tool Kit, User Manual |
| Warranty & support | |
| Warranty Description | 1 year |
| Other details | |
| Bike Type | Electric Bike, Folding Bike |
| Suspension Type | Front |
| Electric Assist Type | pedal assist |
| Is Assembly Required | No |
| Intended Riding Terrain | Paved Roads |
| Additional Features | Adjustable Seat, Dual Disc Brake, Durable, Foldable, Headlight |
| Brake Style | Disc |
| Specific Uses For Product | Road |
| Style Name | S4 Black |
Other Brand electric bicycles
How it compares
This product against the closest alternatives we track in electric bicycles.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Gotrax 16" Folding Electric BikeThis product | 4.4 / 5 | 555 | 4.0 / 5 |
| Wooken Electric Bike for Adults with 500W MotorWooken | 4.4 / 5 | 312 | 4.1 / 5 |
| TotGuard Electric BikeTotGuard | 4.4 / 5 | 286 | 4.1 / 5 |
| ANCHEER 14" Folding Electric Bike for TeensAncheer | 4.2 / 5 | 329 | 4.0 / 5 |
| EUY Electric Bike for Adults with Peak 1500W MotorEUY | 4.5 / 5 | 301 | 4.0 / 5 |
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Questions about the Brand S4 Black
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How far can the Gotrax S4 go on a single charge?
Amazon's listing states about 15.5 miles in pure electric mode and up to 28 miles using pedal-assist, though actual range depends on rider weight and terrain.
Is the Gotrax S4 hard to assemble?
Reviewers report assembly times from about 15 minutes to just under an hour, with tools included and most major components pre-assembled.
Does the Gotrax S4 fold down small enough for a car trunk?
It folds from the middle of the frame, though one owner found the folded shape more awkward to carry than the unfolded bike despite fitting in tighter storage spaces.