2027 Altis Sigma | 98V 35Ah 25kW Electric Dirt Bike

98 Volts 25kw of power, Updated suspension, a new TFT display

The 2027 Altis Sigma brings 25kW of peak power, a Samsung 50S battery pack, and updated suspension to an electric dirt bike built for serious off-road riding. Choose the Sigma MX with 19/16-inch wheels for its torque-focused configuration, or the Standard with 19/18-inch wheels for a larger rear wheel and higher listed top speed.

For 2027, Altis focused on the parts you interact with every ride: suspension support, the display, and ignition. Adjustable off-road dual-spring suspension pairs with a stiffer rear setup and a rear shock similar in size to an Ultra Bee shock. The new TFT display and physical ignition key paired with NFC give the cockpit a useful update, with both keyed and NFC access.

The automotive-standard hairpin motor delivers 25kW, approximately 34 HP. Hairpin refers to the motor's winding construction, which packs rectangular conductors into the motor rather than conventional round-wire windings. Supporting that output is a 97.2V 35Ah Greenway battery pack with Samsung 50S cells and 3,402Wh of capacity. Charging from 20% to 80% takes approximately two hours.

What Is New for the 2027 Altis Sigma?

• Stiffer rear suspension with a rear shock similar in size to an Ultra Bee shock.
• Adjustable off-road dual-spring suspension to help tailor the setup to rider weight and terrain.
• New TFT display with NFC functionality.
• Physical ignition key paired with NFC for keyed and NFC access.
• Standard 19/18-inch wheel configuration with a 19-inch front and 18-inch rear.
• MX 19/16-inch wheel configuration with a 19-inch front and 16-inch rear.
• Updated listed torque: 688 Nm for the MX with 44T gearing and 615 Nm for the Standard with 39T gearing.

A separate long-range version with a 98V 40Ah battery is expected November 15. The specifications below cover the 35Ah model; the upcoming 40Ah version is separate.

2027 Sigma Standard vs. Sigma MX

Wheel size and gearing work together. The MX's larger 44T rear sprocket favors torque at the wheel, while the Standard's 39T setup favors speed. Rear tire diameter also changes overall gearing, so choose based on the complete setup and the terrain you ride most.

2027 Altis Sigma Specifications, US Version

• Motor: Automotive-standard hairpin motor.
• Peak Output: 25kW / approximately 34 HP.
• Battery: 97.2V 35Ah Greenway battery pack with Samsung 50S cells.
• Battery Capacity: 3,402Wh.
• Charging Time: Approximately 2 hours from 20% to 80%.
• Standard Torque: 615 Nm / 453 ft-lb with a 39T sprocket.
• MX Torque: 688 Nm / 508 ft-lb with a 44T sprocket.
• Standard Top Speed: 80 mph.
• MX Top Speed: 65 mph.
• Suspension: Adjustable off-road dual-spring setup.
• Rear Suspension Update: Stiffer setup with a rear shock similar in size to an Ultra Bee shock.
• Front Suspension Travel: 220mm.
• Display: New TFT display with NFC.
• Ignition: Physical ignition key paired with NFC to have a option of physical key or NFC only.
• Regenerative Braking: 5 adjustable levels.
• Lighting: Baja-style headlight and taillight with brake light and switch.
• Brakes: Heavy-duty disc brakes.
• Tires: Off-road tires.
• Wheelbase: 1,300mm.
• Seat Height: 35 inches.
• Ground Clearance: 13 inches.
• Chain: 520H.

2027 Model Options and Tire Fitment

• 2027 Altis Sigma Standard: 19-inch front wheel, 18-inch rear wheel, and 39T rear sprocket. Tire sizes: 70/100-19 front and 90/100-18 rear.
• 2027 Altis Sigma MX: 19-inch front wheel, 16-inch rear wheel, and 44T rear sprocket. Tire sizes: 70/100-19 front and 90/100-16 rear.

2025 vs. 2026 vs. 2027 Altis Sigma

Comparing the new Sigma with an earlier bike? This side-by-side shows the platform's progression. This listing is for the 2027 model; earlier model years are included for reference.

Specifications vary by model year and configuration. Top speed depends on rider weight, terrain, battery charge, and conditions. The rear shock size comparison does not confirm Ultra Bee parts compatibility.

How the Sigma Platform Got Here

The 2026 Sigma introduced several changes carried into the platform's development: an upgraded BMS intended to improve efficiency and range, higher motor RPM for top-end performance, increased torque, and refined throttle tuning. Hardware updates included a 220mm dual-spring front fork, rear linkage dust seals, reinforced front hubs, a 1 1/8-inch handlebar, an updated headlight, and a 520H chain replacing the earlier 428H chain.

The 2027 builds on that progression with its revised rear suspension, new display, physical key, and Standard 19/18-inch wheel option. For riders comparing torque, the closest gearing comparison is the 2026 39T figure of 601 Nm against the 2027 Standard's 39T figure of 615 Nm. The 2027 MX's 688 Nm figure belongs to its separate 44T configuration.

Why We Like the 2027 Sigma

The Samsung 50S cells and Greenway pack identify the battery hardware behind the power claim, while the hairpin motor supplies the 25kW peak output. The adjustable suspension, 220mm of front travel, and 13 inches of ground clearance give riders practical tools for managing uneven terrain. Those details matter when the ride moves beyond a straight stretch of dirt.

Five regenerative braking levels let you adjust how strongly the bike slows when you roll off the throttle. The new TFT display and physical key paired with NFC make everyday operation more convenient, while the two wheel and gearing choices let you prioritize the riding you actually do.

Important Notes

• The Altis Sigma is water resistant, not waterproof. Avoid direct liquid exposure to the battery, wiring and connectors, controller, cockpit controls, and other electronic components.
• The Altis Sigma is not for use on public roadways. Private property, off-road, or track use only. Please ride responsibly.
• Ships via freight and some assembly is required.
• All bundled items will ship when the bike order is fulfilled.
• Please take note of any current preorder shipping time shown when ordering.

Altis Sigma Assembly Video

Altis Sigma Resources

• OVER THE AIR APP SOFTWARE UPDATE INFORMATION
• ALTIS USER MANUAL
• HOW TO GET FULL POWER FROM MY ALTIS
• Altis Sigma Rider Community - Join the Facebook Group

Shipping & Assembly

• Ships via freight, some assembly required.
• Local pickup available by appointment.
• Always avoid liquid exposure to the battery, controller, or wiring.

2025 Altis Sigma Unveiling Video by REV Rides

This unveiling video features the 2025 model. Refer to the specifications above for the 2027 bike.

Please note: The Altis Sigma is not waterproof, only water resistant. Always avoid liquid exposure to the battery, wires and connectors, controller, cockpit controls, and other electronic components.

Altis Sigma orders ship via freight unless you arrange for local pickup. Some assembly is required.

Who Is the 2027 Altis Sigma For?

• Technical trail riders: The Sigma MX pairs 44T gearing with a 16-inch rear wheel for riders prioritizing torque and acceleration on tighter off-road routes.
• Open-terrain riders: The Standard's 19/18-inch wheels and 39T gearing suit riders who want the larger rear wheel and higher listed top speed.
• Experienced electric dirt bike riders ready for more power: The 25kW motor, adjustable suspension, and 35-inch seat height make the Sigma worth considering for riders comfortable managing a taller, powerful off-road bike.