EUNORAU SPECTER-S 4.0 (Hunter X9) Fat Tire Electric Bike — 1000W Mid-Drive, Hunting & Trail, Full Suspension, 48V 17.5Ah
Buy today and pay in 4 or more payments starting at 0% APR with Shop Pay Installments.
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.
Which frame size fits me?
Both frames fit riders 5'3" to 6'3". The difference is how it feels:
| Frame | Usually the pick for |
|---|---|
| 16" | Riders under about 5'9", or anyone climbing on and off with gear |
| 18" | Riders about 5'10" and up, or anyone with long legs |
Between sizes? Go smaller if you'll be getting on and off a lot with gear. Go larger if you're mostly riding long distances seated.
Still not sure? Call the Ride Desk at (855) 970-3574 with your height and inseam and we'll tell you straight which one to order.
Your Hunter's Kit: $348 of gear, on us.
Three things most riders end up buying in the first month. With this bike, you won't have to.
Pickup Tailgate PadGet the bike to the lease without scratching the truck.
$239FREE
Thermal Battery WrapCold mornings drain range. This helps the battery hold its heat.
$69FREE
Genesis HelmetLightweight, adjustable, ready on day one.
$40FREE
How do I get my kit?
It ships with your bike automatically. Nothing to add, no code to enter, and it never adds a cent to your total. You'll see "Free Hunter's Kit: Included" under your bike in the cart and on your order confirmation. It ships free and may come in its own box, so it can arrive a day or two apart from your bike.
One kit per bike, while kit supplies last.
Authorized EUNORAU dealerGenuine, brand-new bikes with full factory warranty
Every bike we sell is new and factory-sealed, from brands we're authorized to carry. You get the complete manufacturer warranty, exactly as intended.
Price match guaranteeFind it lower at another authorized dealer? We'll match it.
If another authorized EUNORAU dealer advertises this exact bike for less, send us the link and we'll match the price. Ask before you order, or within 7 days after your order and we'll refund the difference. See how price match works
2YR 24-month+ warranty, 10-year frameIf something goes wrong, we handle the claim for you
Send the Ride Desk a message and a short video. We'll help figure out what's wrong and take the warranty claim from there, so you're never left sorting it out alone.
EUNORAU covers original parts under its 24-month+ limited warranty and the frame for 10 years. To keep coverage, register the bike with EUNORAU after delivery (we'll send you the link) and schedule a check-up after the first year. Wear items and labor aren't covered.
14-day returnsTime to make sure it's the right bike
Start a return within 14 days of delivery. The bike should have under 10 miles on it and be in its original box. See full return terms. If it arrives damaged or with a defect, contact us right away and we'll work it out with you.
Free delivery in 7–10 daysSignature required. Damaged in transit? We handle it.
Your bike ships FedEx or UPS to the lower 48, and a signature is required so it's never left on the porch. Before you sign, check the box. If it's torn or crushed, note it on the delivery slip and send us photos the same day. We'll take it from there with the carrier.
Pay over timePay in 4 or more payments, starting at 0% APR
Choose Shop Pay Installments at checkout to see your options and rate before you commit. Checking your eligibility won't affect your credit score, and your card details are never shared with us.
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.
Ride it the day it arrivesArrives mostly assembled, tool kit included
No bike shop needed. Most of the job is attaching the handlebar, front wheel, pedals, and seat, and the manufacturer's step-by-step video walks you through it. Charge the battery fully, set the riding mode for where you'll ride, and you're out the door. Stuck on a step? Send the Ride Desk a photo and we'll talk you through it.
EUNORAU SPECTER-S 4.0 (Hunter X9) Fat Tire Electric Bike — 1000W Mid-Drive, Hunting & Trail, Full Suspension, 48V 17.5Ah
For Hunters Whose Ground Is Too Rough for a Hardtail
You know the stretch.
Washed-out two-track. Exposed roots across the trail. Rock on the logging road, and ruts the side-by-sides carved in last fall. On a hardtail, every one of them comes up through the seat and into your back, and you reach the stand already worn out.
The EUNORAU SPECTER-S 4.0 (Hunter X9) is built for exactly that ground. It's the most fully equipped bike in the Hunter line: real trail-grade suspension, a 1,000-watt mid-drive with 11 gears, four-piston brakes, and a rack and fenders already bolted on when it arrives.
Here's what each piece does for you.
Suspension That Takes the Hit So You Don't
Up front is an EXPLORER fork with 140mm of travel (about five and a half inches) and thick 36mm stanchions, the sliding tubes that keep the fork stiff and steady when you hit something hard. That's nearly double the 75mm on the FAT-HS and DEFENDER-S.
In back, an AO-38RC rear shock gives the rear wheel 50mm of movement. Together they keep both tires on the ground over roots and rock, which means more grip on loose climbs, steadier braking on descents, and a lot less fatigue by the time you're climbing into the stand.
A Mid-Drive With 11 Gears to Work With
The motor is a Bafang G510 1,000W mid-drive. Mid-drive means it sits at the pedals and drives the chain, so it uses the bike's gears exactly like your legs do. And this bike has a lot of them: a SRAM NX 11-speed with an 11–42 tooth cassette, a very wide range. Downshift before a steep grade and the motor climbs in its sweet spot instead of lugging, the same reason a truck pulls a load uphill in low gear.
A shift sensor briefly eases the motor while you change gears, so all that power isn't grinding the chain. A thumb throttle gets you moving without pedaling.
Brakes Sized for a Loaded Bike
Most e-bikes use two-piston brake calipers. The SPECTER-S uses four-piston hydraulic disc brakes on 180mm rotors. Four pistons squeeze the rotor with more pad area, so you get more stopping power and better control with less hand effort, which matters when the bike, you, and your gear add up to a lot of weight heading downhill.
Battery, Tires, and Ready-to-Ride Extras
The removable 48V 17.5Ah battery uses LG cells and holds about 840 watt-hours (think of it as the gas tank). EUNORAU rates it at up to 40 miles. An optional 48V 5Ah secondary battery (sold separately) raises that to up to 52 miles, and it has a USB-C port that can top up a phone or headlamp.
Kenda 26" × 4.0" fat tires on 36-spoke stainless-steel wheels float over mud, sand, and snow. And unlike most bikes in this class, it arrives with an aluminum rear rack and full front and rear fenders installed, plus front and rear lights. No accessory hunt before opening day.
It ships as a Class 2 e-bike, assisted up to 20 MPH, and carries 300 pounds of total payload, rider and gear combined.
The Honest Part
- "How heavy is it?" 83.7 pounds. Plan on a heavy-duty hitch rack rated for fat-tire e-bikes.
- "Is it a downhill bike?" No. Rear travel is 50mm, and the 140mm fork does most of the work. It's built to take the edge off rough ground, not to jump.
- "Is the 52-mile range real?" It's the rated number with the optional secondary battery, which isn't included. Cold mornings, steep climbs, heavy loads, and high assist all cut range. Plan conservatively.
- "Can I put a whole deer on the rack?" No. The rack is for gear, and the 300-lb payload includes you. Use a game trailer (confirm its hitch fits first) or quarter the deer and make two trips.
- "Is it silent?" Quiet, not silent. A mid-drive hums under load. Most riders drop to a low assist level or pedal the final approach.
- "Where can I ride it?" Many public tracts marked non-motorized don't allow e-bikes. Private land and leases are where this bike shines.
Is This Your Bike?
The SPECTER-S 4.0 fits riders about 5'3" to 6'3" in two frame sizes. The 16" usually suits riders under about 5'9", or anyone climbing on and off with gear; the 18" fits riders about 5'10" and up. It comes in Moon Black and Army Green.
Pick it if your ground is rough and steep, and you want the best suspension, brakes, and gearing in the Hunter line with nothing left to add. If snow, sand, or deep mud is your bigger problem, the DEFENDER-S 2.0 (Hunter X6) puts a motor in each wheel for traction.
What Shows Up at Your Door
A factory-sealed EUNORAU SPECTER-S 4.0, mostly assembled, with the rack, fenders, lights, battery, charger, and kickstand. The free Hunter's Kit shown above ships with it. EUNORAU's warranty covers the motor, battery, and electronics for 24 months and the frame for 10 years, and our Ride Desk handles any claim for you. Shipping is free to the lower 48, delivery takes about 7–10 business days, and you have 14 days to return it if it isn't right.
Pick your frame size and color above. The rough ground isn't getting smoother.
SPECTER-S 4.0 Questions
Is the secondary battery included?
No. The bike ships with the 48V 17.5Ah main battery. The 48V 5Ah secondary battery is an optional add-on.
16" or 18" frame?
The 16" usually fits riders under about 5'9", or anyone mounting with heavy gear on. The 18" fits riders about 5'10" and up. Between sizes? Send the Ride Desk your height and inseam and we'll help you choose.
How is it different from the SPECTER-ST?
The SPECTER-S 4.0 is the hunting version: 4-inch fat tires, a rack and fenders installed, and Hunter colors. The SPECTER-ST is a step-thru trail bike with 27.5" × 3.0" tires and no rack or fenders included.
How do I keep the battery going on cold mornings?
Store and charge the battery indoors, install it right before you ride, and start with a full charge. Cold batteries deliver less range, so plan shorter distances on freezing days.
Why ride with VortexCycles
Buying an e-bike online takes trust. Here's exactly what you get when you buy from us.
Authorized dealer for Revi Bikes, EUNORAU, Rattan, HappyRun, and Yamee. Every bike is new, factory-sealed, and backed by the full manufacturer warranty.
Coverage, spelled out. Manufacturer warranties run 12 to 24 months depending on the brand, with EUNORAU frames covered for 10 years. They cover manufacturing defects, not wear parts like tires, brake pads, and chains. Each bike's exact coverage is listed on its page, and optional Product Protection adds accidental-damage coverage.
Help from start to finish. Get straight answers on fit, power, and setup before you order, and support with warranty claims after it arrives.
Ships free from a U.S. warehouse. Most bikes arrive in 7–10 business days by FedEx or UPS to the lower 48. Tracking is emailed as soon as your bike ships, and a signature is required on delivery.
The two minutes that protect your purchase. Before you sign, walk around the box. If it's torn, crushed, or punctured, write it on the delivery slip and photograph it before you open it. A clean signature makes a damage claim much harder to win. Some brands require damage reports right away, so open the box the day it arrives. We'll work the claim with you.
14-day returns. Start a return within 14 days of delivery. See full return terms.
Pay over time. Shop Pay Installments shows your options at checkout, and checking won't affect your credit.
Secure checkout. Payments run through Shopify's encrypted checkout, and we never see or store your full card number.
Questions? Chat with us, call (855) 970-3574, or email info@vortexcycles.bike, Monday–Friday, 9am–5pm CT. We reply to every email within one business day.
Quick answers
The questions riders ask us most, answered up front. Want to talk it through? The Ride Desk is glad to help by chat or at (855) 970-3574.
Is the secondary battery included?
No. The bike ships with the 48V 17.5Ah main battery. The 48V 5Ah secondary battery is an optional add-on.
16" or 18" frame?
The 16" usually fits riders under about 5'9", or anyone mounting with heavy gear on. The 18" fits riders about 5'10" and up. Between sizes? Send the Ride Desk your height and inseam and we'll help you choose.
How is it different from the SPECTER-ST?
The SPECTER-S 4.0 is the hunting version: 4-inch fat tires, a rack and fenders installed, and Hunter colors. The SPECTER-ST is a step-thru trail bike with 27.5" × 3.0" tires and no rack or fenders included.
How do I keep the battery going on cold mornings?
Store and charge the battery indoors, install it right before you ride, and start with a full charge. Cold batteries deliver less range, so plan shorter distances on freezing days.
Why buy from Vortex instead of somewhere else?
It's the same factory-sealed EUNORAU bike with the full manufacturer warranty. What you get on top: the free gear kit shown above, our price match (find it lower at another authorized dealer and we'll match it), and the Ride Desk. If anything goes wrong, you send us a message and a short video and we handle the warranty claim with EUNORAU for you, so you're never stuck in a support queue alone.
When will it arrive?
Usually in 7–10 days. Shipping is free to the lower 48 by FedEx or UPS, and a signature is required so your bike is never left on the porch. You'll get tracking by email as soon as it ships.
How much assembly is there?
The bike arrives mostly assembled. You'll typically attach the handlebar, front wheel, pedals, and seat, and the manufacturer's step-by-step video walks you through it. Get stuck? Send the Ride Desk a photo and we'll talk you through it.
Will it fit me, and can I handle it?
Check the specs above, the frame size guide under the size buttons, and the size chart in the photos. If you're near the edge of the height range, between frame sizes, or unsure about the weight, send us your height and inseam. We'll tell you straight, even if the answer is a different bike.
How far will it really go?
The range in the specs is the manufacturer's test number, usually measured with a light rider in a low assist level on flat ground. Heavier riders, hills, wind, cold, and throttle use all shorten it. Tell us your weight and your usual route, and we'll give you a realistic estimate.
Is it legal where I ride?
The class rating and top speed are in the specs below. In most states, an e-bike ridden within its Class 1, 2, or 3 limits doesn't need a license, registration, or insurance, but trail and town rules vary, so check yours. Any higher-speed modes are for private property only.
How should I charge and store it?
Use the included charger, charge on a hard surface away from anything flammable, and unplug once it's full. For longer storage, keep the battery partly charged in a cool, dry place and top it up now and then. Your owner's manual has the exact guidance for your model.
Can I pay over time?
Yes. Choose Shop Pay Installments at checkout: buy today and pay in 4 or more payments starting at 0% APR. Checking your eligibility won't affect your credit score. 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.
Talk to the Ride Desk. Real people who know these bikes. Tap the chat bubble or call (855) 970-3574, Monday–Friday, 9am–5pm CT.
