YVY K20 Fat Tire Electric Bike, 1500W Moto-Style
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YVY K20 Fat Tire Electric Bike, 1500W Moto-Style
The K20 is the middle of YVY's three-bike moto line: the Lite's frame and stance, with a 1500W motor and hydraulic brakes instead of mechanical ones.
960 watt-hours and hydraulic brakes for $769 — the most battery per dollar in the moto line.
The YVY K20 is the moto-style fat-tire pick at $769: a 1500W motor, a removable 48V 20Ah (960Wh) pack, hydraulic dual disc brakes and 20x4.0 tires, rated to 330 lb of rider and cargo. Free US shipping, a US warranty we file for you, and Shop Pay instalments at checkout.
YVY is not a separate maker. Its own company-address page names the business as "HK RIDSTAR TRADE LIMITED", its warranty page routes service to a ridstar.net support address, every page it publishes links the Ridstar trade-mark certificate, and ridstar.com runs its own "YVY Ebikes" collection. Its warranty page lists as "Warranted Products" the "YVY Q20 1200W", the "YVY Upgraded Q20 1500W" and the "YVY Q20Pro 2000W", the model family the US Consumer Product Safety Commission has told owners to stop using.
On every published specification (1500W, 48V 20Ah, 20-inch fat tire, price) the K20 matches the Ridstar Q20 Luxe 1500W. No regulator's notice names this model as of September 11, 2026.
The CPSC issued two stop-use warnings on that family in 2026: March 19, "Ridstar Q20 and Q20 Pro", batteries and wires that "can ignite" (11 fires); and June 25, "Ridstar Q20 and Q20 Lite", a front wheel that "can detach without warning" (32 reports, 31 injuries). The manufacturer "has refused to agree to an acceptable recall" and "has been unresponsive". No notice names a YVY model. Whether a K-badged bike shares the front wheel, fork or battery those notices describe is published by neither company, and this page will not guess.
Before either US notice, the UK Office for Product Safety and Standards published Product Safety Report 2506-0011 on 19 June 2025 for the "Ridstar E-Bikes Q20-Plus, Q20-Mini, E26 Pro and Chargers", risk level "Serious": "the charger has poor quality soldering, and the transformer does not meet the minimum requirements for creepage and clearance distances." Its corrective measure: "The import has been rejected at the border."
Two product-liability suits over a detached Ridstar front wheel were filed in 2026 and are undecided: Cunanan v. Amazon.com Services LLC (D. Or., filed April 7, 2026) alleges a Ridstar Q20 caused "numerous facial fractures"; L.E. v. Walmart Inc. (Palm Beach County, filed July 30, 2026, removed to S.D. Fla.) alleges a Walmart-bought Ridstar's front wheel "unexpectedly detached during normal operation" and injured a minor. Both are allegations, not findings.
The full record, including Trustpilot scores across the company's five Ridstar domains and an owner writing that "Amazon and Ridstar/YVY are not interested in helping me", is in our Ridstar brand profile, verified September 11, 2026.
- 1500WMotor, as rated
- 960Wh48V x 20Ah battery
- 50 / 75 miThrottle / pedal-assist
- 330 lbMaximum load
- 20 x 4.0 inFat tires
Why the K20
1500W, and the number matters legally
YVY rates the rear hub at 1500W with 85 N·m of torque and a 35-degree climbing claim. That is a lot of motor for $769, and it is also the figure that puts this bike outside the federal low-speed electric bicycle definition, which stops at 750W. Both facts are true at once, and the section below quotes the statute so you can check your own state's rules before you ride.
960Wh, and it comes off the frame
The 48V 20Ah pack works out to 960 watt-hours — our arithmetic, from YVY's own volts and amp-hours. It is removable, so it charges at a desk instead of wherever the bike is parked, and YVY quotes about 4 to 6 hours for a full charge. Replacement packs for this model are sold separately at 48V 20Ah.
Hydraulic, front and rear
This is the clearest hardware line between the K20 and the cheaper K20 Lite, which uses mechanical discs. YVY claims hydraulic dual brakes cut average stopping distance by half against mechanical ones. Treat the percentage as a manufacturer claim; treat the hardware difference as real, because it is specified on the page.
5 ft 4 in to 6 ft 2 in, 330 lb all-in
YVY's own FAQ gives a recommended rider height of 5.4 to 6.2 feet and a maximum load of 330 lb. That ceiling is total — rider, clothing, pack and anything strapped to the rear rack — so subtract your cargo before you compare it against your own weight.
What stands out on the spec sheet
- The battery is genuinely large for the money: 48V x 20Ah is 960Wh, which is more pack than most sub-$800 fat-tire bikes carry
- Hydraulic dual brakes are specified, not mechanical — the step up from the K20 Lite is a real hardware difference, not a trim name
- Front fork and rear shock are both specified, so the fat tires are not doing all of the suspension work
- This model's range claims are internally consistent: the bullets and the FAQ on YVY's page both say 50 miles throttle and 75 miles pedal-assist, which is not true of every bike in this range
Why buy it from Redtail
The price
$769
Matched to YVY's own published US price, checked 29 August 2026.
Financing
4 payments
Shop Pay instalments split it into four interest-free payments at checkout, with longer monthly terms offered on larger carts.
Free US shipping
$0
Every e-bike ships free in the lower 48, tracking emailed the moment it leaves.
We file the warranty claim
Done for you
Something goes wrong, you send us photos and your order number and we file the claim and track it to the finish. You never deal with the factory.
US support
Real answers
Fit, delivery, and what the rules are where you ride — a US-based team answers before you order, backed by a 1-year warranty on motor, battery and charger.
Not sure it fits your height, your driveway or the rules where you ride? Email support@redtailebikes.com before you order and we will confirm it — then buy with the button above.
Who the K20 fits
It’s your bike if
- Riders who want the moto silhouette — banana seat, headlight nacelle, battery in the triangle — without stepping up to the dual-battery Pro
- Short, load-heavy trips: 960Wh is a lot of battery for a $769 bike, and the 330 lb ceiling leaves real room for a rider plus cargo
- Mixed surfaces. The 20 x 4.0 tires and front-and-rear suspension are the reason to pick this over a rigid commuter
- Anyone who would rather have hydraulic brakes than the mechanical discs on the cheaper K20 Lite
Want something different? We stock it
- If you want the same frame for less — the K20 Lite is $659, the same 20x4.0 moto frame and suspension, with a 1000W motor and a 749Wh pack.
- If you want more range than 960Wh — the K20 25Ah is 1,200Wh in one pack and 90 N·m, YVY's strongest single-motor numbers.
- If you are shorter than 5 ft 4 in — the K16 is the 16-inch-wheel version of this bike, which YVY sizes from 5 ft 2 in.
Straight answers before you order
YVY does not publish a curb weight for the K20.
What it does publish is the load rating: 330 lb of rider and cargo, the highest in this price band, on the same frame the whole K20 family uses. If lifting it up steps is the deciding factor, the K20 Lite is the same frame carrying a smaller pack. See the K20 Lite.
The water-resistance figure is printed as "IP5", which is not a complete IP code.
It is YVY's own wording and we reproduce it rather than upgrade it to a code they never published. The lights and the battery housing are sealed for wet-weather riding, and if a specific ingress rating decides your purchase, ask us before you order and we will put it to the manufacturer in writing.
No UL 2849 or UL 2271 certification is published for this bike.
YVY links an EN 15194 test report sitewide, but it names a different model, so we do not claim it covers this one. What you get from us instead is a US warranty we file and track on your behalf — you never deal with the factory — and if your building or insurer requires specific certification, tell us before you order and we will confirm what documentation exists.
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. Most e-bikes arrive within 5–10 business days after dispatch, depending on location.
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
Buy direct from YVY and their published terms apply: a 15% processing fee plus $200 of return shipping you pay, on a 15-day window capped at 10 miles on the odometer. Buy here and Redtail's terms apply instead — a flat 15% on unopened orders within 3 days, and the freight in was free to begin with. Full terms: Redtail Refund & Return Policy.
Alaska, Hawaii, U.S. territories, P.O. boxes, and remote areas may incur extra charges or be excluded — contact us before ordering. Full terms: Redtail Shipping Policy · Redtail Refund & Return Policy.
Owning it in your state
Built for trails, sand, private land and off-road riding. YVY publishes a 1500W motor and a top speed of 28+ mph. Federal law defines a "low-speed electric bicycle" as having an electric motor of less than 750 watts and a motor-only top speed under 20 mph (15 U.S.C. 2085(b)), so this bike sits outside that definition on the manufacturer's own numbers, and states differ in how they treat machines above it. Our state-by-state guide has the detail for where you ride. The detail for where you ride is in our state-by-state e-bike law guide.
How the K20 compares
| Spec | K20 | K20 Lite | K20 Pro | K16 |
|---|---|---|---|---|
| Price | $769 | $659 | $1,399 | $749 |
| Motor | 1500W brushless rear hub | 1000W brushless rear hub | Dual brushless motors — wattage not published by YVY | 1500W brushless |
| Battery | 48V 20Ah removable lithium-ion | 48V 15.6Ah removable lithium-ion (see notes — YVY also publishes 15Ah) | Two 52V 20Ah removable lithium-ion packs (52V 40Ah total) | 48V 20Ah removable lithium-ion |
| Battery energy | 960 Wh | 749 Wh | 2,080 Wh | 960 Wh |
| Top speed | 28+ mph, as printed by YVY ("28+++ mph") | 28+ mph † | 28+ mph, as printed by YVY ("28+++ mph") | 28+ mph, as printed by YVY ("28+++ mph") |
| Brakes | Hydraulic dual disc | Dual mechanical disc | Hydraulic dual disc | Mechanical disc |
| Tires | 20 x 4.0 in fat | 20 x 4.0 in fat | 20 x 4.0 in fat | 16 x 4.0 in fat |
| Maximum load | 330 lb | 330 lb | 330 lb | 330 lb |
Every figure is YVY's own published spec, read from each model's archived product page on 2026-08-25. — = YVY publishes no figure for that model.
Full specifications
| Motor | 1500W brushless rear hub (YVY's rating) |
| Torque | 85 N·m |
| Battery | 48V 20Ah removable lithium-ion |
| Battery energy | 960 Wh (our arithmetic: 48V x 20Ah) |
| Charging time | About 4-6 hours |
| Top speed | 28+ mph, as printed by YVY ("28+++ mph") |
| Throttle-only range | Up to 50 miles, claimed |
| Pedal-assist range | Up to 75 miles, claimed |
| Tires | 20 x 4.0 in fat |
| Brakes | Hydraulic dual disc |
| Suspension | Front fork and rear shock |
| Drivetrain | 7-speed |
| Riding modes | Pure electric, pedal assist, pedal |
| Display | Multi-function LCD |
| Climb rating | Up to 35 degrees, claimed |
| Water resistance | "IP5", as printed by YVY (not a complete IP code) |
| Maximum load | 330 lb |
| Recommended rider height | 5 ft 4 in - 6 ft 2 in |
| Lighting | LED headlight and tail light |
| Included | 7.2 in phone holder, storage box |
| Assembly | 90% pre-assembled |
| Weight | Not published by YVY |
| Certification | No UL 2849 or UL 2271 certification published. YVY links an EN 15194:2017 test report sitewide, but it covers model FM-002/CDDA20, a cargo e-bike — not this model |
| Motor warranty | 1 year (motor, battery, charger) |
Specifications as published by YVY at yvyebike.com/products/yvy-k20-fat-tire-electric-bicycle, archived 2026-08-25. Watt-hour totals are ours, from YVY's volts and amp-hours.
How to read this spec sheet
- YVY publishes no specification table for any of its bikes. Every figure above was read out of the marketing copy on its own product page, and the exact sentence behind each one is recorded in research/yvy/specs_20260825.json.
- Top speed is printed on YVY's page as "28+++ mph". We render it as "28+ mph" for legibility and quote the original here rather than rounding it into a number YVY did not write.
- "IP5 waterproof" is reproduced exactly as printed. A complete IP code needs two digits or an X placeholder, so we cannot tell whether IP55 or IPX5 was intended, and we do not guess.
- Battery energy in watt-hours is ours, not YVY's: 48 volts x 20 amp-hours = 960 Wh. The multiplication is shown so you can check it.
- This bike is listed twice on YVY's own storefront — at $769 with the SKU and the full image set, and at $799 on a second listing whose description is byte-for-byte identical. We price against the first. A third listing at $1,299 carries different photography of the same bike.
- YVY links two PDFs from every page: an EN 15194:2017 test report (report ATS240329142LR, issued 2 April 2024 by Shenzhen ATS Testing Technology, for model FM-002/CDDA20, a cargo electric bicycle) and the EUIPO trade mark certificate for "Ridstar". Neither covers this model. We say so rather than let a sitewide certificate imply cover it does not give.
We pulled YVY's entire live catalogue on 2026-08-25 — all 46 published listings — and found 13 bike listings covering only 7 distinct bikes. We list one page per bike, priced against the listing YVY actually merchandises, with every price cross-checked against a second independent endpoint (46 of 46 listings agree across two independently fetched endpoints).
Warranty
| Component | Coverage |
|---|---|
| Motor | 1 year from the original owner's receipt or purchase date, whichever is later |
| Battery | 1 year from the original owner's receipt or purchase date, whichever is later |
| Charger | 1 year from the original owner's receipt or purchase date, whichever is later |
| Frame and other components | Not separately stated in YVY's published warranty terms |
| Inbound and outbound repair shipping | Covered by YVY inside the warranty period |
YVY Limited Warranty issued by YVY Bikes, as published on its warranty page. File with Redtail, not with the manufacturer: we are the merchant of record on this order and we open and carry the warranty claim on your behalf.
Frequently asked questions
What is the YVY K20's top speed?
YVY prints "28+++ mph" in pure electric mode on a full charge. That is the manufacturer's figure, not a measured one, and the plus signs are theirs. Actual speed depends on rider weight, terrain, tire pressure and state of charge — and on whatever speed limit applies where you ride.
How far can the K20 actually go on one charge?
YVY claims up to 50 miles on throttle alone and up to 75 miles with pedal assist, and its bullets and FAQ agree on both numbers. Manufacturer range figures are best-case: they assume a light rider, flat ground, low assist and no wind. Plan on materially less in hills or cold, and treat the 960Wh pack rather than the mileage claim as the honest measure of how much energy you are carrying.
Is a 1500W electric bike street legal?
It depends entirely on your state, and the federal definition is the place to start. 15 U.S.C. 2085(b) defines a "low-speed electric bicycle" as having "an electric motor of less than 750 watts (1 h.p.)" and a motor-only top speed under 20 mph for a 170 lb rider. YVY rates this motor at 1500W, so the manufacturer's own figure sits outside that definition, and many states then treat such a vehicle under moped or off-highway rules instead. Check your state before you ride on a road or a bike path — we cannot answer it for your jurisdiction.
What height and weight does the K20 fit?
YVY's own FAQ recommends a rider height of 5 ft 4 in to 6 ft 2 in and states a maximum load capacity of 330 lb. That figure is the total the bike is rated to carry, so count yourself plus anything you are carrying, not just yourself.
What battery does the K20 use, and can I buy a spare?
A removable 48V 20Ah lithium-ion pack, which is 960 Wh. YVY sells replacement packs for this model line separately, listing the K20 variant as a 48V 20Ah lithium battery. A second pack is the only real way to extend range on a ride, because charging takes about 4 to 6 hours.
How long does the K20 take to charge?
YVY states about 4 to 6 hours for a full charge. Because the pack is removable, you can charge it away from the bike, which matters if the bike lives in a garage or a hallway and the outlet does not.
Why does the K20 have fat tires?
The 20 x 4.0 in tires run at lower pressure than a standard tire, which spreads the bike's contact patch and adds grip on sand, gravel, snow and broken pavement. They also absorb small impacts, which is why fat-tire bikes feel calmer on bad surfaces. The trade is rolling resistance and weight: fat tires cost you some efficiency on smooth tarmac.
Who makes YVY?
YVY's own company-address page names the business behind the brand as HK Ridstar Trade Limited, and its warranty page routes service verification through Ridstar. Ridstar's own storefront also lists a YVY collection carrying the K20, K20 Pro and K20 Lite. We state that because it is on their pages; it is a sourcing fact, not a recommendation.
Buy the K20 nowOne click, straight to Shop Pay checkout — four interest-free payments available.
Keep looking
Every YVY at Redtail · Compare the K20 Lite · Compare the K20 Pro · Compare the K16 · E-bike laws in your state · Shop electric bikes by type
Primary sources
- YVY product page: YVY K20 Fat Tire Electric Bike, 1500W Moto-Style yvyebike.com/products/yvy-k20-fat-tire-electric-bicycle. Retrieved 2026-08-25.
- YVY Ebike Warranty yvyebike.com/pages/ebike-warranty. Retrieved 2026-08-25.
- YVY Return & Refund Policy yvyebike.com/pages/return-refund-policy. Retrieved 2026-08-25.
- 15 U.S.C. § 2085, Low-speed electric bicycles uscode.house.gov — 15 U.S.C. § 2085. Retrieved 2026-08-25.
- Redtail Shipping Policy. Retrieved 2026-08-25.
- Redtail Refund & Return Policy. Retrieved 2026-08-25.
- our state-by-state e-bike law guide. Retrieved 2026-08-25.
How we verified this page. Every specification above was read from an archived copy of YVY's own product page (yvyebike.com/products/yvy-k20-fat-tire-electric-bicycle), retrieved 2026-08-25, with the price cross-checked the same day against a second independently fetched YVY endpoint. Figures are the manufacturer's ratings, not our test results. The federal definition is quoted from the statute itself, retrieved from two independent publishers. 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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