Smartravel Explorer DK400 Fat Tire Electric Bike
On saleSave $934.99 (58% off)was $1,599.99
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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.
The DK400 is the lowest-priced fat-tire commuter on our Smartravel shelf at $665: a 1000W peak motor, dual suspension and a removable 48V battery good for up to 28 mph. Free US shipping, and Redtail handles any claim under Smartravel’s 12-month warranty.
Free with your order until October 21, 2026: a lock, mirrors and a rear shelf, the same $208.98 in gifts Smartravel includes with the DK400 on its own store.
- 28 MPH Top speed
- 1000W Peak motor
- 873.6 Wh Removable battery
- 350 lbs Payload 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
$665
Matched to Smartravel’s own sale price for the DK400, checked October 18, 2026. Smartravel’s regular price is $1,599.99.
Free with your order
$208.98 in gifts
On its own store Smartravel includes an e-bike lock ($79.99), e-bike mirrors ($49.99) and the DK400 rear shelf ($79) free with the DK400, and your Redtail order gets the same until October 21, 2026, when Smartravel’s sale timer ends. Smartravel’s gifts are for continental U.S. residents only; a portion will ship separately, typically 3 business days after your e-bike ships.
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 $665 — 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 the bike when it arrives. If anything is damaged, defective or wrong, note it with the carrier and email us photos within 48 hours of delivery, and we resolve it at no cost to you.
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
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.
Paying
Checkout takes the major credit cards, Google Pay, Shop Pay and Apple Pay (in Safari).
Who answers for your order
The company behind this checkout is named in our terms of service, and a person answers too: email is typically answered within one business day, and the phone line on our contact page returns every voicemail.
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.
Smartravel’s 12-month warranty, handled by us
Every DK400 bought from Redtail carries Smartravel’s limited warranty against defects in materials and workmanship, counted from the day it is delivered, as Smartravel’s Warranty & Return Policy sets out (read October 18, 2026). When something goes wrong you write to us, not to the factory: send photos or a video with your order number and we open and manage the claim with Smartravel.
| Frame, front fork, handlebar | 12 months from delivery |
| Motor, controller, charger, main wiring harness | 12 months from delivery |
| Display, throttle, lights, keys and switches | 12 months from delivery |
| Brakes, drivetrain, wheels, shock absorber, kickstand, pedals, saddle, fenders | 12 months from delivery |
| Battery | 12 months from delivery, to 75% of its original capacity through 300 charging cycles, whichever comes first |
Smartravel supplies covered parts free; fitting labor is covered when its after-sales team authorizes it, and warranty parts ship within the lower 48. Claims are made within one year of purchase, with photos or video.
What Smartravel’s warranty does not cover:
- Wear parts: tires, inner tubes, spokes and brake pads
- Accessories, including free gifts (Smartravel's product pages say the warranty service does not include free accessories)
- Damage from abuse, neglect, misuse, an accident, stunt riding or ramp jumping
- Damage from water, from improper charging or from a charger Smartravel or its dealers did not supply
- Third-party parts, and any part that has been modified or tampered with
- Lost or damaged keys or NFC card
- Electrical parts repaired or modified by someone Smartravel has not authorized (that voids the warranty)
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 September 24, 2026 and re-checked against its live page on October 18, 2026; every price is the one each bike sells for here today.
| Spec | DK400 | Raptor ST202 | ZOONLAI UrbanX |
|---|---|---|---|
| Price | $665 | $1,199.99 | $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 September 24, 2026 and re-checked against Smartravel’s live page on October 18, 2026. 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.
- Smartravel's Warranty & Return Policy sets 12 months for every component and the battery. Its product pages also print '1-year all-inclusive' (with batteries and free accessories outside 'the warranty service'), 'a 2-year warranty for each ebike', and, on the Rocket ST201F and DK400, 18 months. We plan to the policy's 12 months; if a longer term matters to you, tell us and we will put the question to Smartravel in writing before you order.
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 $665. The Rocket ST201F starts at a higher price with a larger battery option and a published 32 mph top speed.
Buy the DK400 now One click, straight to Shop Pay checkout — your free lock, mirrors and rear shelf come with it.
Keep looking
Our Explorer DK400 review · The Smartravel brand guide · 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; re-checked 2026-10-18.
- Smartravel Return & Warranty Policy www.smartravelor.com/pages/return-policy. Retrieved 2026-10-18.
- Smartravel Shipping Policy www.smartravelor.com/pages/shipping-policy. Retrieved 2026-10-18.
- Smartravel's owner's-manual and assembly-video page www.smartravelor.com/pages/download-my-owners-manual-or-view-assembly-video. Retrieved 2026-10-18.
- 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 September 24, 2026 and re-checked against the live page on October 18, 2026. The price was matched to Smartravel’s own on October 18, 2026, read from its product page and its official catalog feed, and the gifts and warranty terms were read from its buy box and its Warranty & Return Policy the same day.
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. Verified by Milad Ghobadibeygvand, BScN (Western University, 2014), who writes and reviews for Redtail. 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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