SMARTRAVEL DK400 Electric Bike for Adults
- Electric Bicycle
- 20 inches
- 330 pounds
- 720 Wh
- More reviewed than 88%
A capable fat-tire e-bike on paper, with real ride quality reported by several buyers, but recurring reports of motor faults and unresponsive customer service after the first few months of ownership.
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How it ranks among the 478 electric bicycles we track
3.9★ across 133 Amazon ratings, Bayesian-smoothed toward the category average.
133 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
The SMARTRAVEL DK400 is a 1000W peak motor electric bike with a removable 48V/15Ah battery, 20x4.0 fat tires and Shimano 7-speed gearing, built for commuting or off-road riding at speeds up to 28+ MPH.
The bike arrives 85 percent pre-assembled, needing only the front wheel, fender, kickstand, handlebars and pedals attached before its first ride, and it is UL2849 certified for battery safety. Reviews split sharply between buyers who found solid value in the frame, brakes and ride quality, and others whose bikes developed motor or fit problems within months, alongside difficulty reaching customer service.
- 1000W peak motor, up to 28+ MPH
- 26+ mile range electric-only, 45+ miles with pedal assist
- 20x4.0 fat tires with front and rear suspension
- UL2849 certified battery
Who it's for
Works for riders who want a fat-tire commuter or trail e-bike at a mid-range price and are comfortable troubleshooting minor assembly issues themselves. Less suited to buyers who need reliable after-sale support, since multiple reviewers describe difficulty reaching customer service when problems came up.
What buyers say
From Amazon customer reviews.
Buyers who had a smooth experience praise the aluminum frame, stopping power and overall ride comfort, with one calling it worth the higher price for the build quality. Others report the motor becoming intermittent or failing to engage after four to six months of use, mismatched rack mounting holes, and real speed and range falling short of the advertised numbers for heavier riders, compounded by customer service that reviewers describe as unreachable by phone or email.
Strengths and trade-offs
Drawn from this product's published specifications.
- Removable 48V/15Ah battery for easy charging
- Dual mechanical disc brakes with motor cutoff
- Front and rear suspension smooths rough terrain
- Arrives 85% pre-assembled
- Multiple reports of motor failing after several months
- Customer service described as hard to reach
- Top speed fell short of claims for heavier riders
- Some assembly fit issues, like misaligned rack holes
Specifications
| Brand | Smartravel |
|---|---|
| Model | DK400 |
| Dimensions & fit | |
| Wheel Size | 20 inches |
| Maximum Weight Recommendation | 330 pounds |
| Item Weight | 68.34 pounds |
| Size | 20 inches |
| Wheel Width | 4 inches |
| Capacity & performance | |
| Bicycle Gear Shifter Type | Trigger |
| Bicycle Drivetrain Type | Hub Drive |
| Number Of Speeds | 7 |
| Age Range Description | Adult |
| Power & efficiency | |
| Lithium Battery Energy Content | 720 Wh |
| Wattage | 720 watts |
| Power Source | Rechargeable battery |
| Construction & materials | |
| Frame Material Type | Carbon Steel |
| Wheel Material | Carbon Steel |
| Color | BLACK |
| Included components | |
| Included Components | Air Pumb*1, Charger, Phone holder*1, Tool Kit, User Manual |
| Warranty & support | |
| Warranty Type | Limited |
| Warranty Description | 2 years |
| Other details | |
| Bike Type | Electric Bike, Cross Country Bike, Commuting Bike |
| Suspension Type | Dual |
| Electric Assist Type | Throttle and Pedal Assist |
| Is Assembly Required | Yes |
| Model Year | 2024 |
| Additional Features | Digital Display, Dual Disc Brake, Dual Suspension, Headlight, Rechargeable |
| Brake Style | Disc |
| Specific Uses For Product | Gravel, Road, Snow |
| Style Name | Standard Edition |
| Theme | Electric Vehicles |
Other Smartravel electric bicycles
How it compares
This product against the closest alternatives we track in electric bicycles.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| SMARTRAVEL DK400 Electric Bike for AdultsThis product | 3.9 / 5 | 133 | 3.6 / 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 |
| Gotrax 16" Folding Electric BikeBrand | 4.4 / 5 | 555 | 4.0 / 5 |
Similar electric bicycles from other brands
Questions about the Smartravel DK400
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
How far can the SMARTRAVEL DK400 go on a charge?
The listing states 26+ miles in pure electric mode and 45+ miles in pedal-assist mode, though actual range depends on rider weight and terrain.
Does the DK400 arrive fully assembled?
It ships about 85 percent assembled, with the front wheel, fender, kickstand, handlebars and pedals left for the buyer to attach.
Are there reliability concerns with this bike?
Yes, several reviewers report the motor becoming intermittent or failing to engage after several months of ownership, along with difficulty reaching customer service.