Altis Powersports

Altis Sigma, Delta, Delta S and Delta DBK Compared: Which Electric Dirt Bike Should You Buy?

Altis Powersports sells two families of electric dirt bikes: the high-power Sigma and the lighter Delta line, which includes the Delta, Delta S and Delta DBK. They look related but ride very differently. This guide compares them side by side so you can pick the right one. Radical eBikes is an authorized Altis Powersports dealer in Las Vegas. We ship nationwide. Contact us with your ZIP code and the model you want, and we will tell you the shipping details.

The short version

• Sigma: the flagship. Highest power, largest battery and highest top speed. Built for experienced riders who want maximum performance.
• Delta: a lighter, lower-power bike with selectable speed levels. A good all-rounder for trails and learning.
• Delta S: the most affordable step in the Delta line, with less power and a smaller battery than the Delta.
• Delta DBK: a Delta with a rear foot brake, upgraded suspension and more torque, built with Dirt Bike Kidz.

Specs below come from Altis Powersports and retailer and review listings. Altis updates models between years, so confirm the current figures on the product page before you order.

Side-by-side comparison

Altis Sigma: maximum power

The Sigma uses a 98V hairpin motor with about 23 kW of peak power and 601 Nm of torque. Its 97.2V, 35Ah battery stores about 3.4 kWh, and the listed top speed of the Trail 19-inch version is about 80 mph. Suspension is a long-travel adjustable air fork (about 220mm) and a rear linkage shock (about 200mm). It weighs roughly 198 lb.

Sigma MX: the MX swaps the rear wheel for a 16-inch and is reported at about 64 mph in race mode, with a livelier feel on tight trails. The core hardware is shared with the Sigma.

Who it is for: experienced riders who want the most power Altis offers and can handle a heavy, fast bike. If you are new to motorcycles, start lower in the lineup.

Altis Delta: the all-rounder

The Delta uses a segmented 13 kW peak motor, 385 Nm of rear-wheel torque and a 72V, 35Ah (2,520 Wh) battery. It has 17-inch front and 14-inch rear wheels, a forged aluminum alloy frame, a color display and three selectable speed levels (15, 37 and 62 mph). Altis lists about 2 hours to charge from 20% to 80%.

The speed levels are useful. A new rider can start in Level 1 and move up as skills grow, and a parent or coach can limit the bike for a younger or newer rider. Pair that with proper gear and supervision.

Altis Delta S: a step down in power and cost

The Delta S shares the Delta's frame and wheel sizes but uses an 8 kW peak motor, 273 Nm of torque and a smaller 72V, 30Ah (2,160 Wh) LG battery. Altis lists speed levels of 22, 37 and 60 mph. Charging from 20% to 80% takes about 3 hours.

Who it is for: newer riders, or anyone who wants Delta ergonomics at a lower price and doesn't need the extra power.

Altis Delta DBK: built with Dirt Bike Kidz

The Delta DBK keeps the Delta's 13 kW peak motor, 72V, 35Ah battery and 62 mph top speed, but Altis lists a number of upgrades: a heavy-duty rear foot brake, a foldable brake lever, upgraded adjustable off-road suspension, a headlight, forged aluminum parts and more torque (399 Nm). It also has a DBK graphic kit, seat and red hub.

Who it is for: riders who want a more motocross-style setup with a foot brake and better suspension.

How to choose

• New to motorcycles? Look at the Delta S or Delta first. The selectable speed levels let you grow into the bike.
• Want more suspension and a foot brake? Look at the Delta DBK.
• Experienced and want the top end? The Sigma and Sigma MX are the performance choices.
• Weight matters: the Delta is listed at about 164 lb and the Sigma at about 198 lb. Think about loading, lifting and trailering.
• Where you ride: trails and tight spaces favor the Delta line. Open desert favors the Sigma.

Riding rules and safety

Nevada defines Class 1, 2 and 3 e-bikes with a 750 watt limit (NRS 484B.017). These bikes are well above that, so treat them as off-road motorcycles. Check Nevada DMV rules on registration and street use, and ride only where off-road vehicles are allowed. Local parks, trails and public land often restrict motorized vehicles, so confirm the rules for the place you plan to ride.

Wear proper gear:

• A DOT or ECE-rated motocross or motorcycle helmet, not a bicycle helmet
• Goggles or a face shield
• Gloves, boots that cover the ankle, and long pants and sleeves
• Knee and elbow guards, and a chest protector if you ride hard
• A rider course or a first ride with an experienced friend if you are new to motorcycles

Also, ride within your skill level. These bikes accelerate quickly, and speed levels exist so you can build up gradually.

Battery and charging

• Use the charger that came with the bike and charge on a hard, non-flammable surface where you can see it.
• Heat is hard on lithium batteries. In Las Vegas summers, do not leave the bike or battery in a hot car or garage in direct sun.
• Let the battery cool after a hard ride before you charge.
• For long storage, keep the battery partly charged in a cool, dry place.
• If a battery is swollen, smells odd or gets very hot, stop using it and contact us.
• Charging time and range depend on the model, the charger and how you ride, and listed range figures are estimates.

When your Altis arrives

• Check the box and bike for damage and take photos before you sign.
• Ask us before delivery how it ships and what setup is needed.
• Check tires, brakes, bolts, wheels and controls before your first ride.
• Charge the battery fully before riding.
• Contact us if anything looks wrong. Do not ride a bike you are unsure about.

Questions to ask any dealer

• Are you an authorized dealer for this brand? We are for Altis Powersports.
• Who services the bike after the sale?
• What does the warranty cover and who handles claims?
• What are the repair prices for common jobs?
• How is the bike shipped and how is damage handled?

Buying from Radical eBikes

We are an authorized Altis Powersports dealer. We ship nationwide. Contact us with your ZIP code and the model you want, and we will tell you the shipping details. Financing is available on bikes through Synchrony, Affirm, Klarna, ShopPay and AfterPay.

See the Altis collection for current models. Local riders can read our Altis Las Vegas dealer and service guide.

Service after the sale

We repair e-motos in Las Vegas.

See our e-moto repair, diagnostics, brake service and e-moto flat repair pages. Small jobs like flats and brake pads can often be done the same day, though that is not guaranteed.

FAQ

What is the difference between the Altis Delta and Delta S?

The Delta has a 13 kW peak motor, 385 Nm of torque and a 2,520 Wh battery. The Delta S has an 8 kW peak motor, 273 Nm and a 2,160 Wh battery.

What makes the Delta DBK different?

Altis lists a rear foot brake, foldable brake lever, upgraded suspension, headlight, more torque (399 Nm) and DBK styling.

Which Altis is fastest?

The Sigma, with a listed top speed of about 80 mph on the Trail 19/19 model.

Which Altis is best for a beginner?

The Delta S or Delta, because of the lower power and selectable speed levels. Ask us about fit and your experience level.

Do you ship Altis bikes?

Yes. We ship nationwide.

Are you an authorized Altis dealer?

Yes.

Can I ride an Altis on the street in Nevada?

Check Nevada DMV rules. These are above the Class 1, 2 and 3 e-bike limit.