The verdict
The Altis Sigma is the strongest value pick among the 25 kW bikes. For $5,299 at Voro Motors on November 12, 2026 you get a 25 kW (about 34 HP) automotive-style hairpin motor, a 97.2V 35Ah Samsung 50S pack (3,402 Wh), a 2-hour 20-80% charge and up to 508 ft-lb at the wheel in MX trim. It undercuts the Ultra Bee by $700. The catch: Altis is a young brand, and the warranty terms weren't on the pages we read.
What we like
- 25 kW peak (about 34 HP), hairpin motor
- 97.2V 35Ah Samsung 50S pack, 3,402 Wh
- 20-80% in about two hours
- MX (19/16) or Standard (19/19) wheel setups
- Listed torque up to 688 Nm / 508 ft-lb (MX, 44T)
The catch
No warranty term on the Voro or REV pages we read, and a younger brand than Sur-Ron or Talaria. At 198 lb and 35 inches of seat it's also a big bike for a newcomer.
Who it is for, who should skip it
Buy it if
- You want Ultra Bee class power for less money
- You care about charge time between sessions
- You like choosing your wheel setup (MX for tracks, Standard for trails)
Skip it if
- You want a known dealer network and parts everywhere: Sur-Ron and Talaria are easier
- You're a beginner: the Sigma's power needs respect
A 98-volt bike at a light e-moto price
Most light e-motos run 60V or 72V. The Sigma runs a 97.2V 35Ah Greenway pack with Samsung 50S cells, 3,402 Wh in all. Higher voltage lets a motor make more power with less current, which is why Altis can quote 25 kW peak from an automotive-standard hairpin motor while keeping the bike under 200 lb.
The 2027 spec table on the dealer page lists 198 lb, a 35-inch seat, 13 inches of ground clearance and 220 mm of front travel.
Video: "The Most Powerful Electric Dirt Bike for the Money: Altis Sigma MX", Freshly Charged on YouTube. Not made by us; chosen because it shows the bike or the topic clearly.
MX or Standard: pick your gearing
Altis sells two setups. The MX runs 19/16 wheels and a 44T sprocket: 688 Nm (508 ft-lb) listed torque and a listed top speed of 65 mph. The Standard runs 19/19 wheels and a 39T sprocket: 615 Nm (453 ft-lb) and a listed 80 mph. Voro showed the MX in stock and the Standard unavailable on our check date.
For most trail riders, the MX is the right call: more pull out of corners, and 65 mph is more than any trail needs.
Charging and the 40Ah question
Altis quotes about two hours from 20 to 80%, which is a big help on a riding day. REV Rides also mentions a long-range 98V 40Ah version expected later in November; the specs and price here are for the 35Ah model we could read today.
How the Altis Sigma earns its 8.8
Our formula gives each of seven criteria a score out of 10 from the published figure, then weighs them. Here is the Altis Sigma's line, with each criterion's weight in the overall score.
| Criterion | Score | Weight |
|---|---|---|
| Price, against the catalog median (dated, US) | 7.3/10 | 25% |
| Peak motor power (kW) | 9.5/10 | 15% |
| Battery energy (Wh) | 7.8/10 | 15% |
| Weight with battery (lighter is better) | 5.1/10 | 15% |
| Published warranty | 2.0/10 (not stated) | 10% |
| Road status (brand wording) | 4.0/10 | 10% |
| Charging time (published) | 9.0/10 | 10% |
Weighted together, that's 8.8/10 on our published scale, No. 4 of 14. Anything marked not stated scores 2/10: publish the figure and the score goes up. The full formula is on our methodology page.
Altis Sigma specs
| Peak power | 25 kW peak (about 34 HP), automotive-style hairpin motor |
|---|---|
| Battery | 97.2V 35Ah, Samsung 50S cells, 3,402 Wh |
| Weight | 198 lb (2027 spec table, dealer) |
| Top speed | 65 mph (brand) |
| Torque | 688 Nm / 508 ft-lb (MX, 44T sprocket) or 615 Nm / 453 ft-lb (Standard) |
| Seat height | 35 in |
| Charging | About 2 hours from 20% to 80% |
| Road status | Off-road electric dirt bike. |
| Battery per $100 | 64 Wh per $100 |
| Power-to-weight | 12.6 kW per 100 lbs |
Figures are the brand's or the US dealer's, read on November 12, 2026. Anything not listed above wasn't published on the pages we read, and our formula scores it as not stated.
What's in the box
The bike and charger, in MX or Standard wheel trim.
Getting started
Crate assembly (bars, front wheel), a full charge, tire pressure and suspension sag. The Sigma is tunable: set it to a soft mode for the first rides and learn the throttle before you explore the top of the power band.
Whatever bike you buy, set the softest mode for the first rides, check every bolt after the first few hours, and keep the battery charged between 20 and 80% when you store it, unless the manual says otherwise.
Hidden costs
Freight, gear, wear parts sized for a 25 kW bike, and possibly a second wheel set if you want both MX and trail tires. Ask the dealer about warranty terms before you pay: we couldn't read them on the product pages.
Plan the total, not the sticker: freight or dealer prep, a full set of gear (helmet, goggles, boots, gloves, armor; see our safety gear guide), a stand, and wear parts. Road rules vary by state; read are electric dirt bikes street legal? before you ride on public roads.
Questions to ask the seller
- What warranty does Altis give, and who honors it in the US?
- MX or Standard: which one is in stock, and when?
- Is the 40Ah version worth waiting for at my riding pace?
- Where do spare parts ship from?
Price and sources
$5,299 at Voro Motors on November 12, 2026 (Voro Motors product page (US); list price shown $5,899). MX version in stock at Voro Motors on November 12, 2026. Prices on e-motos move often: check the live price before you buy.
Sources read on November 12, 2026: voromotors.com/products/altis-sigma-best-electric-dirt-bike-98v-35ah-e-dirt-bike · revrides.com/products/altis-sigma-electric-dirtbike
Alternatives
The three bikes closest in price, and how they differ on the published specs:
Segway Xaber 300 costs about the same ($5,299.99), has less punch (21 kW peak against 25 kW peak), carries 232 Wh less battery, is 11 lbs lighter (187 lbs). It scores 8.1/10, below the Altis Sigma's 8.8, so we'd only pick it for that one strength.
E Ride Pro SR costs $100 less ($5,199), carries 198 Wh more battery, is 15 lbs lighter (183 lbs). It scores 8.7/10, below the Altis Sigma's 8.8, so we'd only pick it for that one strength.
E Ride Pro SS 4.0 costs $300 less ($4,999), has less punch (18 kW peak against 25 kW peak), carries 198 Wh more battery, is 37 lbs lighter (161 lbs). It scores 9.2/10, ahead of the Altis Sigma, so it deserves a look before you decide.
Head-to-heads and rankings, and the rankings where the Altis Sigma appears:
