Smartravel Explorer DK400 Fat Tire Electric Bike
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Smartravel Explorer DK400 Fat Tire Electric Bike
The Smartravel Explorer DK400, photographed for Smartravel's own product listing.
A fat-tire moped-style commuter with real front-and-rear suspension, under $700.
A $699.99 fat-tire commuter with a 1000W peak motor, dual suspension and a removable 48V battery good for up to 28 mph. Free US shipping, a Redtail-handled warranty claim, and Shop Pay financing at checkout.
- 28 MPHTop speed
- 1000WPeak motor
- 873.6 WhRemovable battery
- 350 lbsPayload capacity
Why the DK400
Dual suspension, not just a front fork
A front and rear shock absorber pair with 20" x 4.0" fat tires, built for cracked pavement, gravel and light trail rather than smooth roads only.
A removable pack you can charge off the bike
The 48V lithium pack lifts out of the frame and charges in about 5–6 hours on the included charger. Smartravel's spec list rates it at 18.2Ah, 873.6 Wh.
Turn-signal lighting and a rear rack, standard
LED lighting includes turn signals, not just a headlight and taillight, and the bike ships with an alloy kickstand and a rear rack included — neither is an add-on here.
What stands out on the spec sheet
- 873.6 Wh of battery capacity at a sub-$700 price point
- Dual front and rear shock absorbers, not a front fork alone
- Removable battery — charge it off the bike
- Rear rack and turn-signal lighting included
Why buy it from Redtail
The price
$699.99
Matched to Smartravel’s own sale price for the DK400, checked 2026-09-24. Smartravel’s regular price is $1,599.99.
Pay over time
4 interest-free payments
With Shop Pay, the $699.99 DK400 could be split into 4 interest-free payments of $175.00 every 2 weeks.
Rates from 0-36% APR. Payment options through Shop Pay Installments are subject to an eligibility check and are provided by these lending partners: affirm.com/lenders. Options depend on your purchase amount, and a down payment may be required. State notices to consumers: affirm.com/licenses.
Free US shipping
$0
The DK400 is the least expensive of the Smartravel fat-tire bikes we carry, and it still ships free in the lower 48 — no freight surcharge for the wide tires or the dual suspension.
We file the warranty claim
Done for you
Smartravel's 12-month term names the motor, battery, controller and charger — on the DK400 that includes the removable pack. If one of them fails, send photos and your order number and we file the claim with Smartravel for you.
US support
Real answers
A US-based team can tell you what this bike's published 28 mph rating means for the paths you actually ride, before you spend the money.
Not sure it fits your height, your ride or the rules where you live? Email support@redtailebikes.com before you order and we will confirm it in writing — then buy with the button above.
Who the DK400 fits
The DK400 suits a rider about 5'3" to 5'9" who wants fat tires and suspension at both ends for rough pavement and gravel, at $699.99 — and who will wheel a 68.3 lb bike rather than carry it.
It’s your bike if
- Riders who want a fat-tire commuter with shock absorbers front and rear
- Riders who want to charge indoors — the pack lifts out of the frame
- Riders about 5'3" to 5'9", the height range on Smartravel's sizing chart for this frame
Want something different? We stock it
- If you want GPS tracking and app control on a fat-tire bike — the Raptor ST202 is built for that from the spec sheet up.
- If you want a lighter, lower-priced commuter without fat tires — the ZOONLAI UrbanX is a 500W step-through at roughly half the price.
What you get with the order
Shipping
Free shipping on every electric bike within the contiguous United States (lower 48).
Orders are prepared and dispatched within 1–3 business days of confirmation. Most e-bikes arrive within 5–10 business days after dispatch, depending on location.
Alaska, Hawaii, U.S. territories, P.O. boxes and remote routes are quoted case by case — send us your ZIP before you order and we will confirm the route and any extra cost in writing.
Delivery protection
Inspect your shipment at delivery. Damage, defects, or incorrect items must be reported with photos within 48 hours; claims submitted after this window are not accepted.
Bikes with power, charging, or component issues are covered under the manufacturer warranty; Redtail coordinates repair or replacement remotely at no cost to the customer.
Returns
Anything damaged or defective on arrival: send photos within 48 hours and we take it from there, at no cost to you. Change of mind on an unopened, factory-sealed bike: start the return within 72 hours of delivery and the freight in was free either way. Full terms: Redtail Refund & Return Policy.
All of it is handled by our own US team — you place the order, we track it in, and if anything is wrong we deal with Smartravel on your behalf. Full terms: Redtail Shipping Policy · Redtail Refund & Return Policy.
Owning it in your state
Federal law defines a “low-speed electric bicycle” as a vehicle with a motor under 750 watts and a maximum motor-powered speed under 20 mph (15 U.S.C. § 2085(b)). The DK400's motor is published at 750W sustained and 1000W peak, not under that 750-watt line, with a 28 mph top speed, so state law — not the federal low-speed-bicycle carve-out — governs where and how you can ride it.
The detail for where you ride is in our state-by-state e-bike law guide.
How the DK400 compares
Every figure is Smartravel’s own published spec, read from each model’s archived product page on 2026-09-24.
| Spec | DK400 | Raptor ST202 | ZOONLAI UrbanX |
|---|---|---|---|
| Price | $699.99 | $1,249.99 | $339.99 |
| Motor | 1000W peak, 750W sustained (also described as 1200W-class) | 1500W peak, 1200W sustained, rear geared hub | 500W (stated as both rated and peak power) |
| Battery | 48V, 18.2Ah, 873.6 Wh | 48V, 27Ah, 1,296 Wh | 48V, 10.5Ah, 504 Wh, integrated |
| Top speed | 28 mph | 32+ mph | 24 mph |
| Brakes | Dual mechanical disc | Hydraulic disc, front and rear | Mechanical disc |
| Tires | 20" x 4.0" fat tire | 20" x 4.0" fat tire | 24" x 2" |
| Payload capacity | 350 lbs | 350 lbs, rider and cargo combined | 330 lbs |
Full specifications
| Motor | 1000W peak, 750W sustained (also described as 1200W-class) |
| Torque | 86 N·m (also stated as 80 N·m) |
| Battery | 48V, 18.2Ah, 873.6 Wh (also stated as 17.5Ah and 15Ah) |
| Top speed | 28 mph |
| Pedal-assist range | 45+ miles (also stated as 40 and 50+ miles) |
| Throttle-only range | 26+ miles (also stated as 28 and 30+ miles) |
| Charge time | 5–6 hours (also stated as 5 hours) |
| Weight | 68.3 lbs, 31.0 kg (a 44 kg shipping weight is also listed) |
| Payload capacity | 350 lbs (Smartravel's sizing chart gives 330 lbs) |
| Brakes | Dual mechanical disc (also stated as hydraulic elsewhere on the same page) |
| Suspension | Dual front and rear shock absorber |
| Frame | Carbon-steel, removable battery |
| Tires | 20" x 4.0" fat tire |
| Drivetrain | Shimano 7-speed |
| Display | Color LCD |
| Lights | LED, with turn signals |
| Included | Alloy kickstand, rear rack, cycling bag, inflator, charger, user manual (Smartravel's own packing list) |
| Seat height | 33 inches (Smartravel's sizing chart gives 32.3 inches) |
| Rider height | 5'3" to 5'9", per Smartravel's sizing chart |
| Safety standard | Smartravel states it is safety certified in accordance with UL 2849 |
Specifications as published by Smartravel at www.smartravelor.com/products/smartravel-electric-bike-for-adults-fat-tire-ebike-with-1200w-motor-48v-17-5ah-removable-battery-up-to-28-mph-shimano7-speed-dual-shock-absorber-mountain-ebike, archived 2026-09-24. Every figure is the manufacturer’s own, verified against that page.
How to read this spec sheet
Smartravel’s pages give more than one figure for some specs on this model; the list below gives both, and the one the table above uses.
- Motor: Smartravel's headline figures give 1000W peak; its spec list gives 750W sustained and 1000W peak; its product description calls the motor 1200W-class.
- Torque: 86 N·m in Smartravel's feature copy, 80 N·m in its spec list.
- Battery: 48V 18.2Ah (873.6 Wh) in Smartravel's headline figures and spec list, 48V 15Ah in its FAQ and battery image, and 17.5Ah in the page's web address. The table uses 18.2Ah.
- Range: Smartravel's feature copy gives 45+ miles with pedal assist and 26+ miles on the throttle; its riding-modes image gives 40 and 28 miles, and its battery image 24 miles; its FAQ gives 50–80 miles on a charge in one answer and 40–60 miles in another; 50+ and 30+ miles appear elsewhere on its site. The table uses the feature-copy figures.
- Weight and load: Smartravel's spec list gives 68.3 lbs (31.0 kg) and a 350 lb maximum load; its sizing chart gives 68 lbs and 330 lbs; a 44 kg shipping weight is also listed.
- Fit: Smartravel's FAQ gives a 33-inch seat height; its sizing chart gives 32.3 inches and a 5'3" to 5'9" rider height.
- Brakes: ‘dual mechanical disc’ in Smartravel's spec list, ‘hydraulic’ in its feature copy. The table prints both.
- Warranty: Smartravel's warranty section states a 12-month warranty, and a help block on the same page mentions a 2-year warranty for each e-bike. 12 months is the term this page uses.
Straight answers before you order
Smartravel gives this motor as 1000W peak and 750W sustained, and its product description calls it 1200W-class.
Plan around 1000W peak: it is the rating Smartravel prints in its headline figures and its spec list, and the table above carries every figure.
Smartravel gives the DK400's battery as 48V 18.2Ah (873.6 Wh) in its headline figures and spec list, and as 15Ah and 17.5Ah elsewhere.
The table above uses 18.2Ah, the figure in Smartravel's spec list, and prints the others beside it. If capacity decides your purchase, email us and we will confirm it with Smartravel in writing before you order.
Smartravel lists the brakes as dual mechanical disc in its spec list and hydraulic in its feature copy.
If brake type decides it, email us before you order and we will confirm it with Smartravel in writing.
Manuals & assembly
Smartravel publishes an owner’s manual and an assembly video for its models on Smartravel's owner's-manual and assembly-video page. Email us and we will send you the current file for your bike directly, along with a plain answer on what is left to put together out of the box — worth asking before you order if that is what decides it.
Frequently asked questions
What is the DK400's real battery capacity?
Smartravel rates the DK400's removable 48V pack at 18.2Ah (873.6 Wh) in its headline figures and spec list; its FAQ and battery image say 15Ah, and its web address 17.5Ah. Plan around 18.2Ah. It charges in 5–6 hours on the included charger.
Does the DK400 have hydraulic or mechanical disc brakes?
Smartravel's page gives both: ‘dual mechanical disc’ in its spec list and ‘hydraulic’ in its feature copy. If brake type decides your purchase, email us before you order and we will confirm it with Smartravel in writing.
Is the DK400 UL certified?
Smartravel states on its product page that the DK400 is safety certified in accordance with UL 2849. If you need the certificate details before you order, email us and we will get them from Smartravel in writing.
What is the DK400's top speed and is it legal to ride on the street?
Smartravel publishes a 28 mph top speed and a motor rated 750W sustained and 1000W peak. The federal low-speed electric bicycle has a motor under 750W and a motor-only top speed under 20 mph (15 U.S.C. § 2085(b)), so your state's e-bike law governs where and how you can ride the DK400 — check the rules for where you live before you order.
Can I charge a second DK400 battery separately?
Yes — the battery lifts out of the frame, so you can charge it off the bike, and Smartravel sells a standalone DK400 replacement pack. Ask us about a spare before you order.
How is the DK400 different from the Smartravel Rocket ST201F?
The DK400 is the lower-priced fat-tire model, with a 1000W peak motor and a 28 mph top speed for $699.99. The Rocket ST201F starts at a higher price with a larger battery option and a published 32 mph top speed.
Buy the DK400 nowOne click, straight to Shop Pay checkout — 4 interest-free payments available.
Keep looking
Every Smartravel bike at Redtail · Compare the Raptor ST202 · Compare the ZOONLAI UrbanX · E-bike laws in your state · Shop electric bikes by type
Primary sources
- Smartravel product page: Smartravel Explorer DK400 Fat Tire Electric Bike www.smartravelor.com/products/smartravel-electric-bike-for-adults-fat-tire-ebike-with-1200w-motor-48v-17-5ah-removable-battery-up-to-28-mph-shimano7-speed-dual-shock-absorber-mountain-ebike. Retrieved 2026-09-24.
- Smartravel Return & Warranty Policy www.smartravelor.com/pages/return-policy. Retrieved 2026-09-22.
- Smartravel Shipping Policy www.smartravelor.com/pages/shipping-policy. Retrieved 2026-09-22.
- Smartravel's owner's-manual and assembly-video page www.smartravelor.com/pages/download-my-owners-manual-or-view-assembly-video. Retrieved 2026-09-22.
- 15 U.S.C. § 2085, Low-speed electric bicycles uscode.house.gov — 15 U.S.C. § 2085. Retrieved 2026-09-22.
- Redtail Shipping Policy. Retrieved 2026-09-22.
- Redtail Refund & Return Policy. Retrieved 2026-09-22.
- our state-by-state e-bike law guide. Retrieved 2026-09-22.
How we verified this page. Every specification above was read from an archived copy of Smartravel’s own product page (www.smartravelor.com/products/smartravel-electric-bike-for-adults-fat-tire-ebike-with-1200w-motor-48v-17-5ah-removable-battery-up-to-28-mph-shimano7-speed-dual-shock-absorber-mountain-ebike), retrieved 2026-09-24, with the price cross-checked the same day against Smartravel’s official catalog feed.
Every figure is the manufacturer’s own rating, verified against its pages; where those pages give two figures for one spec, the "How to read this spec sheet" section prints both. UL/TUV statements are reported as Smartravel’s own claim, never asserted as independently verified. Prices are USD, current at the date shown. Corrections: support@redtailebikes.com.
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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