The verdict
The Altis Sigma is the first newer "fastest electric dirt bike" contender 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 90/100 from a wild spec sheet: 97.2V, 25 kW peak, 601 Nm of wheel torque, a 3.4 kWh Samsung-cell pack, and a $5,299 manufacturer/REVRides price. It also carries the highest top-speed claim of any bike we score — 80+ mph — but that number deserves a hard, honest look, because it is a best-case manufacturer figure rather than a verified one (full breakdown below). The capability is not in doubt; this is a genuine 70+ mph machine that sits between the 68.3 mph Storm Bee and the 75 mph Hightail. What holds the Score back is maturity, not pace: Altis is 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 biggest speed-and-power spec sheet in our catalog for the money, 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 number on a spec sheet.
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 (see the honest breakdown below), 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 $5,299, it undercuts the Storm Bee by about $3,700 while claiming more peak power and a higher top-speed number. That is why the Score lands at 90 even with conservative support assumptions.
How fast is it, really?
This is the number everyone quotes, so it's the number we're going to be straight about. The honest answer: the Altis Sigma is a genuine 70+ mph bike, and the "80 mph" you see everywhere is a best-case manufacturer claim for its fastest gearing — not a figure anyone has verified on a clock. Here's the full picture, because it's exactly the kind of thing a spec sheet hides:
- What Altis and its dealers claim. The listings for the fast configuration — the 25 kW motor with the 39-tooth sprocket and 19/19 wheels — cite 80+ mph, and VORO's own product page goes further, quoting "80+ mph (ideal conditions: 90 mph)." That is the top of the range, under ideal conditions, on the tallest gearing.
- The manufacturer already walked it back. VORO's page carries an explicit note that its performance specs were "adjusted downwards as of 2026," using a heavier rider as the baseline rather than the best-case manufacturer figure. When the seller itself is revising the number down, that's your signal to treat 80 as a ceiling.
- What real-world accounts actually say. The Sigma's earlier 22 kW spec was officially rated "over 70 mph," and that's the language that keeps showing up: VORO's own 2026 write-ups describe a bike that "cruises up to 70 mph," and an independent first-ride review cites the same "over 70 mph" spec and — tellingly — did not run a top-speed test to confirm 80.
- Gearing changes everything. Top speed on these bikes is set by the sprocket, not just the motor. The MX-geared Sigma (44T sprocket) tops out at 68 mph, and other listed configurations come in around 63 mph. The 80+ figure belongs only to the tallest, speed-oriented gearing — swap sprockets for trail torque and you trade top-end away.
- Nobody has published a verified run. We could not find a single instrumented top-speed test — GPS or otherwise — putting the Sigma at 80 mph. Until one exists, 80 is a claim, and we score and describe it as one.
Our read: buy the Sigma expecting a real-world 70+ mph machine — which is still seriously fast, and enough to put it clear of the 68.3 mph Sur-Ron Storm Bee and Dust Moto Hightail. It has the highest number on paper in our catalog, and that's a fair thing to note. What it hasn't earned — because no one has — is a verified "fastest electric dirt bike" crown. We'd rather tell you that than sell you a headline.
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 a top-speed 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: the highest top-speed number in the catalog (80+ mph claimed; a real 70+ mph bike), 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 | 90 | $5,299 | 3,402 Wh (97.2V) | 25 kW | 80 mph claimed (~70+ real) |
| Sur-Ron Storm Bee | 96 | $8,999 | 5,720 Wh (104V) | 22.5 kW | 68.3 mph |
Both top-speed figures are manufacturer claims, and in the real world the gap all but closes — the Sigma is a 70-plus bike by every independent account, and no one has run an instrumented top-speed test on either machine. What actually separates them is ownership. The Altis wins the speed-and-spec-per-dollar fight: more peak power, more voltage, and roughly half the price. The Storm Bee 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.
Compared with
Every head-to-head we have published on this bike:
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 97V e-dirt-bike with a serious powertrain, a surprisingly low price, and the biggest top-speed claim in our catalog — 80+ mph on paper, a genuine 70+ mph in the real world. Its 90 Score reflects exactly that: enormous performance-per-dollar held back by the honest risk of a young platform. If speed and spec-per-dollar are the goal and you accept the support risk — and you buy it for what it verifiably is, not the headline number — this is one of the most bike-for-your-money machines we track.
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; top-speed and real-world figures are manufacturer claims or our own estimates, clearly labeled as such.
FAQ
Is the Altis Sigma worth it?
If you want the biggest speed-and-power spec sheet for the money, yes — 97.2V, 25 kW peak, and a 3.4 kWh Samsung pack for $5,299 is a wild spec-per-dollar (VoltRipper Score 90). Just buy it for what it verifiably is — a 97V, 25 kW speed machine that every real-world account puts at over 70 mph — not for the headline 80 mph number, which is a best-case manufacturer claim no one has verified on a clock. The other catch is maturity: Altis is a young platform with far less parts depth, owner history, and resale certainty than Sur-Ron or Talaria. Skip it if you want the deepest aftermarket, proven resale, or a beginner-friendly bike.
Is the Altis Sigma really the fastest electric dirt bike, and does it really do 80 mph?
It carries the highest top-speed claim of any bike we score — Altis and its dealers list 80+ mph for its fastest gearing, and VORO even cites up to 90 mph in ideal conditions — but treat that as a ceiling, not a verified figure. VORO itself notes it revised its 2026 performance numbers downward (using a heavier rider as the baseline); the earlier 22 kW spec was officially rated 'over 70 mph'; VORO's own reviewers and an independent first-ride test both describe an over-70 bike rather than an 80; and the MX-geared version tops out at 68 mph. No independent tester has published an instrumented top-speed run. Our honest read: plan on a genuine 70+ mph machine — right in the mix with the 68.3 mph Sur-Ron Storm Bee and the 75 mph Dust Moto Hightail — with the highest claim on paper but no settled 'fastest' crown.
Altis Sigma vs Sur-Ron — which should you buy?
The Altis wins outright on raw spec-per-dollar — more voltage, more peak power, and a higher top-speed number than any Sur-Ron, for less than an Ultra Bee. The Sur-Ron wins on the things that show up years in: the deepest aftermarket, biggest community, and the widest pool of used buyers. Buy the Altis if you want maximum speed and spec for the money and are comfortable with a newer platform; buy the Sur-Ron if ecosystem and resale certainty matter more. See our [Altis Sigma vs Ultra Bee comparison](/guides/altis-sigma-vs-sur-ron-ultra-bee).
What's the real range of the Altis Sigma?
Its 3.4 kWh battery is large, but a 25 kW motor at speed spends energy fast — so plan around a realistic figure rather than a best-case claim. VORO frames it as an up-to-50-mile bike; we score it at ~35 real miles for mixed/hard riding. As with every bike here, we treat top-speed and low-speed range claims separately from real trail range (more in our range guide). It is not street-legal as delivered.