Altis Sigma Review: Trail Performance Data

This Altis Sigma review examines verified specifications, component analysis, and direct performance comparisons against established mid-range competitors. The Altis Sigma enters the electric dirt bike market as a high-voltage platform targeting riders seeking performance beyond entry-level 60-72V systems. With claimed outputs reaching 601 Nm torque in MX configuration and top speeds approaching 70 mph, the Sigma competes directly with established mid-tier platforms while introducing voltage specifications previously reserved for premium segments.

The 98V System Architecture

Key considerations for altis sigma review buyers and enthusiasts.

The Altis Sigma's 98V nominal voltage (97.2V measured) represents a 26-36% increase over conventional 72V platforms and 62% above 60V systems. This voltage differential creates measurable efficiency advantages through reduced current requirements for equivalent power output.

At 22.5 kW peak power, a 72V system draws approximately 312A while the Sigma's 98V architecture requires only 230A—a 26% reduction in current flow. Lower current decreases resistive losses (I²R losses) in wiring, connectors, and controller components, improving thermal efficiency by an estimated 8-15% depending on load conditions.

Technical Specifications Analysis

The Sigma employs a hairpin motor design paired with a Greenway-manufactured battery pack using Samsung 50S cells. This combination delivers 3,402 Wh total capacity—positioning the platform between entry-level systems (2,300-2,900 Wh) and premium motocross bikes (5,700-6,500 Wh). This analysis helps riders narrow their altis sigma review choices based on real-world data.

The Sigma delivers 1.8× the power of the Ultra Bee while weighing 35% more (88 kg vs 65 kg). This results in a power-to-weight ratio of 255 W/kg compared to the Ultra Bee's 192 W/kg—a 33% advantage favoring the Sigma.

Powertrain Components

Hairpin Motor Design

The Sigma employs a hairpin winding motor—an automotive-grade design using rectangular copper wire instead of traditional round wire. This configuration increases copper fill factor (the percentage of stator slot volume occupied by conductor material) from typical 40-45% to 60-70%, improving power density and thermal conductivity.

Measured specifications:

• Peak output: 22.5 kW (30 HP) at 8,300 RPM (Limited Edition) / 22 kW at 7,800 RPM (Standard)
• Motor torque: 72 Nm at the motor shaft
• Cooling: Air-cooled design with finned housing
• Efficiency: Estimated 85-90% at peak power based on hairpin motor characteristics

The air-cooled design limits sustained high-power operation compared to liquid-cooled systems. Extended full-throttle use (5+ minutes) will likely trigger thermal derating to prevent motor damage. For riders seeking maximum sustained speed, liquid-cooled platforms offer advantages in continuous power delivery.

Samsung 50S Battery Pack

The Greenway-manufactured battery pack uses Samsung 50S cells—a proven automotive-grade lithium-ion chemistry offering 5,000 mAh capacity per cell. At 97.2V nominal voltage with 35Ah capacity, the pack contains approximately 27 series groups of parallel cells.

Battery characteristics:

• Total capacity: 3,402 Wh (3.4 kWh)
• Charging time: 120 minutes (20-80%), 180 minutes (20-100%)
• Charging input: AC 110V / 12.5A (1,375W max)
• Expected cycle life: 800-1,000 full discharge cycles to 80% capacity
• Pack weight: Estimated 18-22 kg based on energy density

The 3,402 Wh capacity provides approximately 16% less energy storage than the Ultra Bee's 4,070 Wh despite the Sigma's higher power output. This creates range trade-offs discussed in the performance section. These performance characteristics directly impact the altis sigma review experience on the trail.

Performance Data

Altis claims 70 mph top speed for the Sigma, representing a 25% increase over the Ultra Bee's verified 56 mph. This speed differential aligns with the Sigma's 1.8× power advantage, as aerodynamic drag increases exponentially with velocity.

Performance estimates based on specifications:

• Top speed: 70 mph claimed (verification pending independent testing)
• 0-30 mph acceleration: Estimated 2.0-2.5 seconds based on power-to-weight ratio
• Range (mixed terrain): Approximately 50 miles at moderate speeds
• Range (aggressive riding): Estimated 25-35 miles at high power output
• Power consumption: 68-136 Wh/mile depending on riding style

The 3,402 Wh battery capacity divided by estimated consumption rates yields range projections. At conservative 68 Wh/mile (Eco mode cruising), maximum range approaches 50 miles. Aggressive Sport mode riding at 136 Wh/mile reduces range to 25 miles.

These projections assume optimal conditions. Real-world electric dirt bike range varies significantly based on rider weight, terrain gradient, temperature, and throttle management. Riders should expect 15-25% range reduction in cold weather (below 40°F) due to battery chemistry limitations.

Chassis and Suspension

The Sigma employs an aluminum alloy forged frame design, providing structural rigidity while maintaining the 88 kg total weight. This represents a 35% weight increase over the Ultra Bee (65 kg) but remains significantly lighter than full motocross platforms (105-110 kg). Understanding these metrics is fundamental to making an informed altis sigma review decision.

Chassis specifications:

• Frame material: Aluminum alloy forging
• Wheelbase: 1,285 mm (50.6 inches)
• Seat height: 840 mm (33.1 inches)
• Ground clearance: 300 mm (11.8 inches)
• Steering head angle: 26 degrees

The 1,285 mm wheelbase creates stable high-speed handling but reduces maneuverability in tight singletrack compared to shorter platforms. The 26-degree steering angle provides neutral handling characteristics—steeper angles (24-25°) favor quick turning while slacker angles (27-28°) improve straight-line stability.

Suspension system:

• Front: Adjustable air-spring fork, 200mm travel
• Rear: Linkage-actuated shock, 85mm stroke (200mm wheel travel)
• Adjustability: Air pressure (front), preload and compression (rear)

The air-spring front fork allows precise tuning for rider weight without requiring spring changes. However, air springs exhibit more progressive spring rates than coil springs, potentially feeling harsh on square-edged impacts. The 200mm travel positions the Sigma between trail bikes (180-200mm) and motocross platforms (280-310mm).

Standard vs MX Configuration

Altis offers the Sigma in two wheel configurations affecting final drive ratio and torque multiplication:

Standard Configuration:

• 19-inch front wheel, 19-inch rear wheel
• 39T rear sprocket
• 533 Nm wheel torque
• Optimized for higher top speed and trail riding

MX Configuration:

• 19-inch front wheel, 16-inch rear wheel
• 44T rear sprocket
• 601 Nm wheel torque
• Optimized for acceleration and motocross use

The MX configuration's 44T sprocket (vs 39T standard) increases final drive ratio by 13%, multiplying torque by the same percentage while reducing top speed proportionally. This trade-off favors explosive acceleration and hill climbing over maximum velocity. For riders researching altis sigma review, these specifications provide essential comparison data.

The 16-inch rear wheel in MX configuration lowers seat height slightly and quickens steering response compared to the 19-inch standard wheel. Riders prioritizing tight trail maneuverability benefit from the MX setup, while those seeking sustained high-speed capability should select the standard configuration.

Competitive Analysis

The Sigma competes primarily in the $4,500-$6,500 segment against established 72V platforms while offering voltage specifications typically reserved for higher price points.

The Sigma delivers 1.8× the power of the Ultra Bee at approximately 47-65% lower cost, representing exceptional value per kilowatt. However, the Ultra Bee provides 20% more battery capacity and weighs 26% less, favoring range and maneuverability over raw power.

Against the Talaria MX5, the Sigma offers 88% more power while weighing 42% more. The MX5's lighter weight suits technical trail riding, while the Sigma's power advantage benefits open terrain and higher speeds.

Compared to the Stark Varg, the Sigma operates in a different category entirely. The Varg delivers 2.7× the power at 2.3-2.9× the price, targeting professional motocross riders rather than recreational trail users. This is a critical factor for anyone evaluating altis sigma review options in the current market.

Target Rider Profile

The Altis Sigma suits specific use cases based on measured capabilities and limitations:

Ideal candidates:

• Riders seeking high-voltage performance at mid-tier pricing: The 98V system provides efficiency advantages and power delivery characteristics approaching premium platforms without $10,000+ investment
• Trail riders prioritizing power over range: The 22.5 kW output handles steep climbs and high-speed sections, though 3,402 Wh capacity limits extended rides to 25-50 miles
• Intermediate to advanced riders: The 601 Nm wheel torque (MX config) and 70 mph top speed require throttle control and riding experience to manage safely
• Riders upgrading from 60-72V platforms: The voltage and power increase provides noticeable performance gains over Surron Ultra Bee and similar bikes

Poor fit for:

• Beginners: The high power output and aggressive torque delivery present control challenges for inexperienced riders
• Long-distance trail riders: The 3,402 Wh capacity limits range compared to platforms with 4,000+ Wh batteries
• Riders under 5'6": The 840mm seat height may prove challenging for shorter riders to manage at stops
• Budget-conscious buyers: Entry-level platforms like the Altis Delta ($3,299) provide adequate performance for casual riding at lower cost

Frequently Asked Questions

Is the Altis Sigma worth it?

The Altis Sigma delivers exceptional value per kilowatt at estimated $4,500-$5,500 pricing, providing 22.5 kW power output typically found in $8,000+ platforms. The 98V architecture offers theoretical efficiency advantages over 72V systems through reduced current draw. However, the 3,402 Wh battery capacity limits range compared to competitors with larger packs. The Sigma represents strong value for riders prioritizing power and voltage efficiency over maximum range or lightweight handling.

Is Altis Sigma Road legal?

The Altis Sigma's 22.5 kW (30 HP) power output and 70 mph top speed exceed electric bicycle classifications in most jurisdictions. Road legality requires motorcycle licensing, registration, and insurance in most US states and international markets. The bike lacks DOT certification for street use as delivered. Riders must verify local regulations before operating on public roads. For off-road use on private property or designated trails, no licensing requirements apply.

Is the Altis Sigma the fastest e-bike?

The Altis Sigma's claimed 70 mph top speed positions it among faster electric dirt bikes but not the absolute fastest. The Stark Varg reaches 80+ mph with 60 kW power output. The Surron Storm Bee achieves 68 mph. Within the sub-$6,000 segment, the Sigma likely ranks among the fastest production models. However, "fastest" depends on definition—acceleration, top speed, or sustained high-speed capability each favor different platforms.

How much is the Altis Sigma ebike?

Pricing varies by retailer and configuration. Voro Motors lists the Limited Edition at approximately $5,499, while standard editions appear at $4,499-$4,999 depending on dealer and included accessories. RevRides and Urban Electrica show similar pricing in the $4,500-$5,500 range. MX configuration (44T sprocket, 16" rear wheel) may command $100-$200 premium over standard setup. Pricing represents 47-65% savings compared to the Surron Ultra Bee ($8,499) while delivering 80% more power.

How fast is the Altis Sigma in mph?

Altis claims 70 mph top speed for the Sigma in standard configuration with 39T sprocket. The MX configuration with 44T sprocket reduces top speed by approximately 13% to 61-63 mph while increasing acceleration and torque. Actual speeds depend on rider weight, terrain gradient, battery state of charge, and wind conditions. At 20% battery remaining, voltage sag typically reduces top speed by 8-15%. Independent verification of claimed speeds remains pending as of this analysis.

How safe is the Altis Sigma?

Safety depends on rider skill, protective equipment, and appropriate use. The Sigma's 601 Nm wheel torque (MX config) can cause sudden rear wheel spin on loose surfaces, requiring throttle control. The 200mm suspension travel handles moderate jumps and rough terrain but proves insufficient for aggressive motocross use with 4+ foot jumps. The 260mm front / 220mm rear disc brakes provide adequate stopping power for the 88 kg weight. The 98V electrical system requires proper maintenance procedures to avoid shock hazards—always disconnect battery before servicing. Riders should wear full protective gear including helmet, boots, gloves, and body armor.