YVY K20 25Ah Fat Tire Electric Bike, Peak 2000W Full Suspension
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YVY K20 25Ah Fat Tire Electric Bike, Peak 2000W Full Suspension
The largest single battery YVY fits: 48V 25Ah, or 1,200Wh, against the standard K20's 960Wh.
The K20 25Ah is the big-battery single-pack bike in YVY's range at $1,349: a peak 2000W motor, 90 N·m of torque and a 48V 25Ah battery worth 1,200Wh, with full suspension and a 7-speed drivetrain. YVY claims 45 to 90 miles per charge. It is also the thinnest spec sheet they publish.
- Peak 2000WMotor, as rated
- 1,200Wh48V x 25Ah battery
- 90 N·mTorque
- 45-90 miRange, claimed
- 28 mphTop speed, claimed
Who the K20 25Ah is for
Buy it if
- Range without the Pro's price or complexity — 1,200Wh in one pack is 25% more energy than the standard K20 carries
- Climbing. YVY rates this one at 90 N·m and a 40-degree gradient, the strongest claims in its range on both counts
- Riders who would rather manage one large battery than two smaller ones
- Anyone who wants the most motor YVY publishes on a single-motor bike
Look elsewhere if
- You want a complete spec sheet before buying. This listing does not publish tire size, brake type, rider height range or charging time, and we have left all four blank rather than borrow them
- You need a bike inside the federal low-speed electric bicycle definition — a peak 2000W rating is nowhere near the 750W ceiling
- You want photographs of detail. YVY publishes three images for this bike against eight and ten for the cheaper K20 and K20 Lite
- You want a published weight, or a UL 2849 / UL 2271 certification — YVY publishes neither for any bike in this range, and the EN 15194 report it links covers a different model
1,200Wh — the biggest single pack in the range
48 volts by 25 amp-hours is 1,200 watt-hours, our arithmetic from YVY's own figures. That is 25% more energy than the standard K20's 960 Wh and, unlike the K20 Pro's 2,080 Wh, it arrives in one removable pack rather than two. If your objection to the Pro is that it is two batteries to track, charge and eventually replace, this is the alternative YVY offers.
Peak 2000W, 90 N·m — and what "peak" leaves out
YVY rates this one at a peak 2000W producing 90 N·m, and claims it climbs 40-degree slopes. Those are the strongest numbers in their range. But peak wattage is a burst figure, not what the motor sustains, and YVY publishes no continuous rating to put beside it. A peak-2000W motor and a continuous-2000W motor are very different machines, and this page does not tell you which one this is.
45 to 90 miles, and a rare honest span
YVY states this bike travels 45 to 90 miles on a single charge. That is worth noting because it is a range rather than a single best-case number — most listings in this catalogue quote only the top figure. A span at least admits that conditions decide the outcome. Expect the low end in hills, cold or heavy throttle use, and the high end only with low assist on flat ground.
Four rows YVY does not fill
This listing publishes no tire size, no brake type, no recommended rider height and no charging time. The obvious move would be to copy them from the K20, which shares the model name — and we have not, because YVY has not said these bikes share those parts. Every one of those rows reads "not published by YVY" in the table below. If any of them decides your purchase, ask us before you order and we will put the question to the supplier.
Where this bike sits in US law
Bikes in this power class raise one question before any other, so here is the statute rather than a summary of it. Federal law defines the category this way:
the term “low-speed electric bicycle” means a two- or three-wheeled vehicle with fully operable pedals and an electric motor of less than 750 watts (1 h.p.), whose maximum speed on a paved level surface, when powered solely by such a motor while ridden by an operator who weighs 170 pounds, is less than 20 mph.
15 U.S.C. § 2085(b) (Pub. L. 107–319, § 1, Dec. 4, 2002, 116 Stat. 2776). Retrieved 2026-08-25 from the U.S. Government Publishing Office and confirmed word for word against Cornell's Legal Information Institute the same day.
YVY publishes this bike's motor as Peak 2000W brushless (YVY's rating — no continuous figure published) and its top speed as 28 mph, claimed. Set those figures against the threshold above and you can see for yourself that the manufacturer's own numbers fall outside the federal low-speed electric bicycle definition.
What that means in practice is decided by your state, not by us. Many states apply moped, motor-driven cycle or off-highway vehicle rules to machines above the federal threshold, and those rules can reach registration, insurance, licensing, helmet requirements and which paths and trails you may use. Some states set their own wattage ceilings that differ from the federal one. We cannot tell you how your state treats this bike, and we are not going to guess: check before you ride on any public road, bike path or trail.
Start here: our state-by-state e-bike law guide. Current as of 2026-08-25; state law changes, so re-check yours before relying on it.
The honest ledger
Green flags
- 1,200Wh is the largest single pack YVY fits, and it is a real 25% step up in energy from the standard K20's 960Wh
- 90 N·m of torque and a 40-degree climb claim are the highest figures YVY publishes for any of its bikes
- Its photography is YVY-branded, unlike two other listings in the catalogue whose product shots carry a different company's brand mark
- The battery figure is stated consistently in both the title and the body — no contradiction on the number that matters most here
Red flags
- This is the thinnest listing YVY publishes for a bike: about 670 characters of description, against roughly 8,600 for the K20. Four spec rows below say "not published" as a direct result
- "Peak 2000W" is a peak figure, not a continuous rating. Peak wattage is the least comparable number on any e-bike spec sheet, and YVY publishes no continuous figure to sit beside it
- Certification does not cover this bike. YVY links an EN 15194:2017 test report from every page, but that report names model FM-002/CDDA20, a cargo electric bicycle, and no UL 2849 or UL 2271 certification is published for anything in the range
- It carries no SKU and sits in none of YVY's own storefront collections, unlike the K20, K20 Lite, K20 Pro and K16 — so it is merchandised less confidently than the rest of the range
How the K20 25Ah compares
All figures are YVY's own published specs, read from each model's archived product page on 2026-08-25. A dash means YVY publishes no figure for that model — a situation this listing produces more often than the others.
| Spec | K20 25Ah | K20 | K20 Pro | K20 Lite |
|---|---|---|---|---|
| Price | $1,349 | $769 | $1,399 | $659 |
| Motor | Peak 2000W brushless | 1500W brushless rear hub | Dual brushless motors — wattage not published by YVY | 1000W brushless rear hub |
| Battery | 48V 25Ah removable lithium-ion | 48V 20Ah removable lithium-ion | Two 52V 20Ah removable lithium-ion packs (52V 40Ah total) | 48V 15.6Ah removable lithium-ion (see notes — YVY also publishes 15Ah) |
| Battery energy | 1,200 Wh | 960 Wh | 2,080 Wh | 749 Wh |
| Top speed | 28 mph, claimed | 28+ mph, as printed by YVY ("28+++ mph") | 28+ mph, as printed by YVY ("28+++ mph") | 28+ mph in the bullets, 30 mph in the FAQ |
| Range (claimed) | 45-90 miles per charge, claimed | Up to 75 miles, claimed | Up to 180 miles, claimed | Up to 60-80 miles in the bullets, up to 50 miles in the FAQ |
| Brakes | — | Hydraulic dual disc | Hydraulic dual disc | Dual mechanical disc |
| Tires | — | 20 x 4.0 in fat | 20 x 4.0 in fat | 20 x 4.0 in fat |
| Maximum load | — | 330 lb | 330 lb | 330 lb |
Source: each model's page on yvyebike.com, archived 2026-08-25. — = not published by YVY for that model.
Full specifications
| Motor | Peak 2000W brushless (YVY's rating — no continuous figure published) |
| Torque | 90 N·m |
| Battery | 48V 25Ah removable lithium-ion |
| Battery energy | 1,200 Wh (our arithmetic: 48V x 25Ah) |
| Top speed | 28 mph, claimed |
| Range | 45-90 miles per charge, claimed |
| Drivetrain | 7-speed |
| Suspension | Full suspension |
| Climb rating | Up to 40 degrees, claimed |
| Tires | Not published by YVY |
| Brakes | Not published by YVY |
| Recommended rider height | Not published by YVY |
| Charging time | Not published by YVY |
| Maximum load | Not published by YVY for this model |
| 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-k20-25ah-electric-bicycle, archived 2026-08-25. YVY publishes no specification table for any of its bikes, so every figure above was read out of the copy on that page and the sentence behind each one is on file. Watt-hour totals are our arithmetic and are marked as such. Found an error? Email support@redtailebikes.com.
How to read this spec sheet
Manufacturer pages contain marketing, and marketing sometimes disagrees with the marketing an inch below it. Rather than quietly pick numbers, here is every place YVY's own page disagrees with itself for this model, every figure it leaves out, and what we did about each:
- Six rows in the table above read "not published by YVY". That is the honest state of this listing, which runs to about 670 characters against roughly 8,600 for the K20. We did not fill those rows from the K20's page, because sharing part of a model name is not evidence of sharing parts.
- "Peak 2000W" is YVY's wording. Peak power is a burst rating and is not comparable to the continuous ratings used in most regulations or in most spec sheets. YVY publishes no continuous figure for this motor.
- Battery energy in watt-hours is our arithmetic: 48 volts x 25 amp-hours = 1,200 Wh.
- The battery capacity is the one figure this page states twice — in the listing title and in the body text — and both agree at 48V 25Ah.
- Unlike the K20, K20 Lite, K20 Pro and K16, this listing carries no SKU and appears in none of YVY's storefront collections. It is published and buyable, but merchandised less prominently than the rest of the range.
- YVY publishes no specification table for any bike. Every figure here was read out of marketing prose, with the sentence behind each recorded in research/yvy/specs_20260825.json.
- 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.
What we counted
We pulled YVY's entire live catalogue on 2026-08-25 — all 46 published listings — and worked out what is actually on sale. Of 13 bike listings, only 7 are distinct bikes: 6 are the same machines listed a second time, which we proved from byte-identical descriptions, shared image files and, in three cases, by opening the photographs. Six of the thirteen bike listings are the same bikes listed twice — proven by byte-identical descriptions, shared image files, and in three cases by opening the photographs. The duplicates are priced $30–$550 above the merchandised listing of the same bike. We list one page per bike, priced against the listing YVY actually merchandises.
Redtail original analysis, counted from YVY's public storefront feed and collection endpoints on 2026-08-25; every price cross-checked against a second, independently fetched endpoint (46 of 46 listings agree across two independently fetched endpoints). Availability moves; email support@redtailebikes.com for anything not shown here.
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 |
What it covers
Defects in hardware or firmware under regular use during the warranty period. YVY states it will repair or replace, at no charge, a product or part that proves defective because of hardware malfunction under regular use and maintenance.
What you must do
- Keep proof of purchase — YVY excludes claims with no associated purchasing proof, invoice or receipt
- Report the fault inside the 1-year window; YVY dates coverage from receipt or purchase, whichever is later
- Keep the original packaging for a period after delivery, which YVY asks for directly in its product listings
Not covered
- Conditions, malfunctions or damage not resulting from defects in hardware or firmware
- Claims with no purchase proof, invoice or receipt, and no authorised dealer confirmation
- Return shipping when the product is found to have no quality issue, or is confirmed working by YVY's after-sales engineers
- Faults reported after the warranty period, which YVY offers to resolve at material cost instead
YVY Limited Warranty issued by YVY Bikes, as published on its warranty page. One caveat worth knowing: that page lists its “Warranted Products” as the Q20, Upgraded Q20 and Q20Pro — model names that do not appear on YVY's current storefront. The 1-year motor, battery and charger term above is therefore taken from this bike's own product listing, which states it directly. 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.
Shipping, returns & support
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.
Ships via trusted parcel and freight carriers — UPS, FedEx, and LTL freight for larger items — with tracking emailed at dispatch.
On delivery
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
Change-of-mind returns accepted only on unopened, factory-sealed items requested within 72 hours (3 days) of delivery, with a 15% restocking fee plus return shipping. Once a box is opened or a bike is ridden, it is no longer eligible.
Order cancellations carry a 3% transaction fee, because card-processing fees are non-recoverable.
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. YVY publishes its own shipping and return terms, which apply to orders placed directly with YVY, not to orders placed here.
Frequently asked questions
How far can the YVY K20 25Ah actually go on one charge?
YVY claims 45 to 90 miles. It is one of the few listings in their catalogue that publishes a span rather than a single best-case figure, which is more honest about how much conditions matter. The energy on board is 48V x 25Ah, about 1,200 Wh — 25% more than the standard K20 — so under identical conditions expect roughly 25% more range than that bike gives you.
What does "peak 2000W" actually mean?
It means the maximum the motor draws in a burst, not what it sustains. Continuous rating is the figure that describes how a motor behaves on a long climb, and it is the figure most regulations are written around — and YVY publishes no continuous rating for this bike. So "peak 2000W" tells you the ceiling and nothing about the floor. We flag it rather than repeat it as though it were a continuous spec.
Is a 2000W electric bike street legal?
Almost certainly not as a bicycle, and it is a state-by-state question. 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. A peak 2000W motor rated to 28 mph is far outside that description, and states commonly apply moped or off-highway vehicle rules to such a machine. Check your own state's rules before riding on any road, path or trail.
What tires and brakes does the K20 25Ah have?
YVY does not publish either for this model, and we have not copied them from the standard K20's page. Sharing a model name is not evidence of sharing hardware, and guessing on brakes is exactly the kind of specification a buyer should not have to unwind later. If it decides your purchase, email us and we will put the question to the supplier before you order.
How does the K20 25Ah compare to the K20 Pro?
One big battery against two. This bike carries 1,200 Wh in a single 48V 25Ah pack; the Pro carries 2,080 Wh across two 52V 20Ah packs and runs two motors instead of one. The Pro has 73% more energy and costs $50 more. This bike is the simpler machine — one pack to charge, one to replace — and publishes the higher torque figure at 90 N·m.
What height and weight does the K20 25Ah fit?
YVY publishes no recommended rider height and no maximum load for this listing. Its other bikes in this frame family are given as 5 ft 4 in to 6 ft 2 in with a 330 lb ceiling, but YVY has not stated that those figures apply here, so we are not going to assert it. Ask us and we will raise it with the supplier.
Why does this bike have fewer photos than the cheaper ones?
YVY publishes three images for this listing against eight for the K20 and ten for the K20 Lite, and it is the thinnest description of any bike they sell. We have re-hosted all three on our own servers, which is every image that exists for it. It is a fair signal that this is a less-promoted listing in their range, and we would rather say so than pad the page.
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 runs a YVY collection carrying the K20, K20 Pro and K20 Lite. We state that because it is published on their pages; it is a sourcing fact, not a recommendation.
Keep looking
Every YVY at Redtail · Compare the K20 · Compare the K20 Pro · Compare the K20 Lite · E-bike laws in your state · Shop electric bikes by type
Primary sources
- YVY product page: YVY K20 25Ah Fat Tire Electric Bike, Peak 2000W Full Suspension yvyebike.com/products/yvy-k20-25ah-electric-bicycle. Retrieved 2026-08-25.
- YVY Ebike Warranty yvyebike.com/pages/ebike-warranty. Retrieved 2026-08-25.
- YVY Company Address page yvyebike.com/pages/company-address. Retrieved 2026-08-25.
- YVY Shipping Policy yvyebike.com/pages/shipping-policy. 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.
- Redtail's state-by-state e-bike law guide. Retrieved 2026-08-25.
Specifications and prices are YVY's own, reproduced as published from the archived copy of its product page, with contradictions in its copy flagged rather than resolved silently. The federal definition is quoted from the statute itself and was retrieved twice, independently, from the U.S. Government Publishing Office and Cornell's Legal Information Institute. Warranty terms are YVY's; shipping and return terms on this page are Redtail's. Manufacturer sources are cited by name and address rather than linked, because every link on this page should keep you here. Want to see any source we used? Email support@redtailebikes.com and we'll send it.
How we verified this page. Every specification above was read from an archived copy of YVY's own product page (yvyebike.com/products/yvy-k20-25ah-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; where YVY's page disagrees with itself, or leaves a specification out, the “How to read this spec sheet” section names it and says what we did. The federal definition is quoted from the statute and was retrieved from two independent publishers. Prices are USD, matched to YVY's own storefront, current at the date shown. Corrections: support@redtailebikes.com.
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