The verdict
The Altis Sigma is the first newer "fastest electric dirt bike" claim we've seen that clears the catalog bar: real product, multiple US dealers, current manufacturer specs, and an actual price. It earns a VoltRipper Score of 86/100 from a wild spec sheet: 97.2V, 25 kW peak, 80 mph, 601 Nm of wheel torque, a 3.4 kWh Samsung-cell pack, and a $4,799 manufacturer/REVRides price. That makes it the fastest verified bike we track, ahead of the 75 mph Sur-Ron Storm Bee and Dust Moto Hightail. The catch is not capability - it is maturity. Altis is still a young platform with far less parts depth, owner history, and resale certainty than Sur-Ron or Talaria.
Who it's for - and who should skip it
Buy it if you want the fastest verified e-dirt-bike in our catalog, you are an experienced rider, you care about raw spec-per-dollar, and you are comfortable buying a newer platform instead of the safest ecosystem play.
Skip it if you are a beginner, want the deepest aftermarket, need proven resale, need a street-legal machine, or would rather own a known platform than chase the biggest speed number.
What it actually is: a 97V speed build for trail riders
The Sigma is not another 60V Sur-Ron clone. The current production spec uses a 97.2V / 35Ah pack rated at 3,402 Wh, feeding an 8 kW nominal / 25 kW peak motor. Altis and dealer listings cite 80 mph top speed, with a 20 mph city/limited mode, 19/19 wheels, adjustable full suspension, dual hydraulic brakes, a TFT display, NFC, and 5-level regenerative braking.
On paper, that is absurdly strong for the money. At $4,799, it undercuts the Storm Bee by about $4,200 while claiming more peak power and a higher top speed. That is why the Score lands at 86 even with conservative support assumptions.
Range reality
The range number needs the usual VoltRipper filter. VORO frames the Sigma as an up-to-50-mile bike, but that is not the number to plan an 80 mph performance loop around. We score it at ~35 real miles for mixed/hard riding. With a 3.4 kWh pack, that is still useful range, but the whole point of this bike is speed and power - and speed burns watt-hours fast.
The upside is charge time: Altis quotes a 3-hour full charge and roughly 2 hours to 80%, so the battery is not just large; it is reasonably quick to refill.
Where it wins, where it costs you
Wins: fastest verified top speed in the catalog, 25 kW peak output, large 97V Samsung pack, strong chassis spec, and a price that makes the spec sheet look almost unfair.
Costs you: a young support ecosystem, unclear long-term parts depth, limited owner history, dealer-price variation, and off-road-only status. The bike is real and shipping; the platform is still earning its track record.
Altis Sigma vs Sur-Ron Storm Bee
| Bike | VoltRipper Score | Price | Battery | Peak power | Top speed |
|---|---|---|---|---|---|
| Altis Sigma | 86 | $4,799 | 3,402 Wh (97.2V) | 25 kW | 80 mph |
| Sur-Ron Storm Bee | 88 | $8,999 | 5,720 Wh (104V) | 22.5 kW | 75 mph |
This is the cleanest way to understand the Sigma. The Altis wins the speed-per-dollar fight: higher top speed, more peak power, and roughly half the price. The Storm Bee still wins as the safer all-around ownership play: bigger battery, full-size motorcycle feel, proven Sur-Ron support, better resale, and a much deeper parts ecosystem. Choose Altis if you want the spec-sheet weapon; choose Storm Bee if you want the known platform.
Bottom line
The Altis Sigma deserves a scored spot because it is no longer just a forum rumor or a rival-list headline. It is a real, dealer-listed, spec-verified 80 mph e-dirt-bike with a serious 97V powertrain and a surprisingly low price. Its 86 Score reflects exactly that: enormous performance-per-dollar held back by the honest risk of a young platform. If speed is the goal and you accept the support risk, this is now the bike to beat.
VoltRipper is spec-verified and data-driven - we do not claim hands-on testing of this bike. Specs and prices are cross-checked against the sources listed above and re-verified regularly; real-world figures are our own estimates or manufacturer caveats, clearly labeled.