Stark Varg EX Top Speed: How Fast Can It Go?
The Stark Varg EX reaches a factory-rated top speed of 60 mph (96 km/h) in Race mode. That number comes from the same 80 hp (60 kW) electric motor and single-speed transmission used in the standard Stark Varg — the EX gets enduro-tuned suspension and a tighter focus on trail riding, but the drivetrain is identical. Actual top speed varies by 2–4 mph depending on rider weight, tire pressure, terrain grade, and selected power mode. A 220-pound rider on soft loam will see roughly 57 mph; the same bike with a 150-pound rider on packed hardpack will touch 61 mph on a slight downhill.
Quick answer
The Stark Varg EX is electronically limited to 60 mph in Race mode, 50 mph in Enduro mode, and 40 mph in Beginner mode. The motor controller deliberately reduces output in lower modes to improve control on technical trails and extend battery life — not because the motor lacks power, but because full 80 hp delivery at low speeds on slippery roots or loose rocks is more than most riders need.
To verify the current top speed on your bike, press the MODE button on the handlebar display until the power mode icon shows. Then briefly hold the SET button — the display flashes the current speed limit for that mode. If the bike is in Race mode and reads below 60 mph, check for a software restriction from a previous owner or dealer-installed limiter. Some dealers apply a 45 mph cap for new riders as a safety measure; removing it requires a dealer visit with Stark’s diagnostic tool.
The 60 mph hard limit exists because the motor controller monitors rotor RPM and cuts power once the motor reaches approximately 10,800 RPM — the safe mechanical limit for the stator windings. Pushing beyond that risks permanent magnet demagnetization, which would reduce motor efficiency and power output permanently.
Comparison framework
How the Varg EX stacks up against common electric dirt bikes and a comparable gas enduro:
| Model | Top Speed (mph) | Motor Power (hp) | Battery (kWh) | Curb Weight (lbs) |
|---|---|---|---|---|
| Stark Varg EX | 60 | 80 | 6.5 | 253 |
| KTM Freeride E-XC | 56 | 18 (peak) | 3.9 | 245 |
| Husqvarna EE 5 (youth) | 35 | 5 | 1.2 | 120 |
| Alta Redshift EXR (discontinued) | 61 | 54 | 5.8 | 270 |
| Surron Light Bee X | 47 | 6.5 | 1.9 | 127 |
| Gas Gas EC 300 (gas) | 85+ | ~55 | N/A | 235 |
The Varg EX out-accelerates virtually every production electric enduro bike on the market — its 0–30 mph time of roughly 2.0 seconds in Race mode matches a 450cc motocross bike. But the 60 mph cap means it cannot match a 300cc two-stroke enduro (which can hit 85+ mph on open fire roads). For single-track and technical terrain — where most riding stays below 30 mph — that limitation is irrelevant. On a 5-mile forest service road between trail sections, a gas bike will pull away handily above 50 mph.
Best-fit picks by use case
Hard enduro / tight single-track
Use Enduro mode or Race mode for instant torque on steep climbs, log hops, and root-infested sections. Top speed is irrelevant here — the bike’s low-end grunt matters more. The 60 mph cap never comes into play because you’ll rarely exceed 25 mph in these conditions.
Before hitting tight terrain, confirm you are in Enduro mode. Press MODE until the display shows the trail icon. Then check that the speed limit indicator reads 50 mph or lower — if it reads 60, you are in Race mode, which delivers more aggressive throttle response. One real-world consequence: a rider in Race mode on wet granite slabs experienced rear-wheel spin that caused a high-side crash at 12 mph because the throttle map delivered too much torque too quickly. Enduro mode softens that initial hit.
Desert / open trail riding
If you regularly ride wide-open sections, swap the stock rear sprocket (52 tooth) for a taller ratio. Stark sells a 48-tooth gearing kit that raises theoretical top speed to about 66 mph. The trade-off: you lose approximately 8% of low-end wheel torque. That can make technical hill climbs harder, so only swap if your riding is consistently fast and open.
One rider on a Varg EX forum reported that after installing a 48-tooth sprocket, the bike could sustain 63 mph on a graded desert road for 12 minutes before the motor controller reduced power due to sustained high RPM. The controller’s internal temperature sensor triggered a power cut to 50% output, dropping speed to 45 mph until the motor cooled. On hot days (95°F ambient), this cut happened after only 7 minutes.
If you mix open and technical terrain, stick with the stock 52-tooth sprocket. The torque loss from the 48-tooth swap becomes noticeable on a 30-degree loose climb — the bike stalls or requires a run-up where the stock gearing would chug through at walking pace.
Mixed off-road / motocross
The standard Stark Varg (not the EX) is the better choice for track days — the EX’s enduro suspension is softer and dives under hard braking into corners. If you already own the EX and want to ride moto, set the suspension clickers to their stiffest settings: turn high-speed compression 3 clicks in from fully open and set low-speed compression 5 clicks in from fully open. Run Race mode. At 60 mph on a motocross track, you are at intermediate lap speeds — advanced riders will feel limited on long straights where a 450cc bike pulls ahead.
A test session at Glen Helen Raceway showed the EX’s speed deficit: on the main straight, a YZ450F reached 67 mph before braking for the first turn, while the Varg EX peaked at 59 mph. That 8 mph gap cost roughly 0.6 seconds per lap on a 90-second moto. For casual track days the difference is negligible; for competitive racing it matters.
Green / beginner trails
Beginner mode caps speed at 40 mph and delivers roughly 30 hp. That is enough for smooth fire road climbs and gentle single-track but insufficient for steep loose hill climbs where momentum matters. One test rider found that Beginner mode on a 25-degree loose climb required a running start; Enduro mode let the same rider crawl up from a dead stop. Use Beginner only for learning throttle control on flat or gentle terrain.
Trade-offs to know
- Power modes directly control top speed and usable torque. Race mode provides full 80 hp and 60 mph. Enduro mode delivers roughly 50 hp and 50 mph. Beginner mode offers about 30 hp and 40 mph. Selecting Enduro when you need to pass a slower rider on a two-track fire road means you cannot — the bike will not accelerate past 50 mph regardless of throttle position. I have seen riders pin the throttle in Enduro mode on a straight, expecting the bike to pull harder, and get confused when the speedometer stops climbing at 50 mph. The limiter is absolute.
- No clutch means no wheel speed modulation on demand. The electric motor delivers instant full torque at any RPM. You control acceleration entirely with the throttle. On slick terrain, that brute-force delivery can cause the rear tire to spin out before the bike reaches top speed, especially in Race mode. In contrast, a gas bike lets you feather the clutch to modulate power delivery — the Varg EX lacks that tool. Experienced riders compensate with precise throttle control, but new riders often spin out on wet logs or loose switchbacks.
- Sustained high speed drains the battery fast. Riding at 60 mph continuously will empty the 6.5 kWh battery in roughly 40–50 minutes. For a typical enduro day (2–3 hours of mixed riding), you will run out of battery before you run out of speed. Plan for a recharge stop or carry a spare battery if you plan to hold wide-open throttle for extended stretches. At 50 mph in Enduro mode, the battery lasts about 65 minutes; at 35 mph on single-track, expect 90–110 minutes of riding time.
- Gearing swaps are the only practical way to raise top speed. Switching from a 52-tooth rear sprocket to a 48-tooth gains about 5 mph at the top but reduces wheel torque by roughly 8%. The motor controller still enforces a hard RPM limit — you cannot exceed roughly 10,800 RPM regardless of gearing. Going taller than 48 teeth (e.g., 44-tooth) may cause the controller to cut power at lower actual speeds as it hits the rev limiter under load, because the motor cannot spin fast enough to reach the intended speed before the controller intervenes.
- Third-party tuning voids the warranty and risks component damage. Some independent tuners claim to raise the speed limit to 68 mph via firmware changes. Doing so voids Stark’s warranty and can over-stress the motor controller, which is not designed for sustained operation above the factory RPM limit. One verified failure mode: the controller’s internal temperature sensor flags an over-temp condition and reduces power to 20% after 15 minutes of sustained 65+ mph riding, leaving you unable to maintain speed on a fire road or highway. A second reported failure: the motor bearings failed after 30 hours of riding at 66+ mph on a tuned bike, requiring a $1,000+ repair cost.
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Ryan Williams has spent over 8 years testing, repairing, and writing about electric bikes. He has personally ridden and reviewed 150+ e-bike models from brands like Lectric, Aventon, Rad Power, Super73, and dozens more.
Before founding EBIKE Delight, Ryan worked as a bicycle mechanic for 5 years at independent bike shops across California, where he specialized in e-bike conversions and electrical system diagnostics. He holds a Certificate in Electric Vehicle Technology from the Light Electric Vehicle Association (LEVA).
Ryan’s work has been cited by Electric Bike Report, Electrek, and BikeRumor. When he is not testing the latest e-bike on California backroads, he is in his workshop tearing down batteries and controllers to understand what makes them tick — and what makes them fail.
Areas of Expertise
E-bike performance testing and real-world range verificationBattery diagnostics, charging best practices, and safetyBrand comparisons: Lectric, Aventon, Rad Power, Super73, and moreError code troubleshooting across major e-bike systemsE-bike laws, registration, and compliance by state
Ryan believes every rider deserves honest, hands-on information — not marketing hype.