Sirius

About

If you have been navigating the electric scooter market for any length of time, you know that there is a distinct difference between the "toys" you find in big-box department stores and the serious machines designed for daily, reliable transportation. The STREETBOOSTER Sirius falls squarely into the latter category. This isn't just a gadget to zip around the driveway; it is a piece of German-engineered mobility hardware designed to replace your car for those short-to-medium urban trips. The philosophy behind the Sirius is refreshing: it prioritizes reliability, serviceability, and a clean aesthetic over flashy lights and gimmicks. It is the kind of scooter you buy when you are tired of fixing flat tires on cheaper models or worrying if your battery will survive the winter.

What immediately sets the Sirius apart is its pedigree. Designed by a German team that clearly understands the frustrations of European commuters, this scooter addresses the biggest pain point of urban riding: charging logistics. With a fully removable battery system that actually works smoothly, the Sirius changes the game for anyone living in an apartment without a ground-floor power outlet. But beyond the battery, the design language is striking because of what is missing-screws. The "no visible screws" design gives it a sleek, unibody look that reminds one more of premium consumer electronics than a typical industrial scooter. It looks grown-up, professional, and ready for the office commute.

The market positioning of the STREETBOOSTER Sirius is interesting. It sits in the premium mid-range. It's not a hyper-scooter doing 80 km/h, but it's significantly more refined than the budget entry-level scooters. It is built for the rider who values the "set it and forget it" mentality. The fact that this specific model is used by major cruise lines like AIDA and MeinSchiff for shore excursions speaks volumes. Cruise lines need equipment that is durable, easy to ride for beginners, and incredibly reliable under constant use. If it can survive the rental fleet life of a cruise ship, it can certainly handle your daily ride to the train station.

Safety

When we talk about safety on two wheels, everything starts with the brakes. The STREETBOOSTER Sirius employs a hybrid braking system that I find to be the sweet spot for urban riding. On the front wheel, you have a low-maintenance drum brake. While disc brakes look cool, they are prone to bending and squeaking if you knock them against a curb. A drum brake is sealed, weather-proof, and virtually maintenance-free. On the rear, you have an electric brake with recuperation (energy recovery) and an ABS function. When you pull the lever, the motor helps slow you down smoothly without locking up the wheel. This combination means you can stop confidently without the fear of going over the handlebars, and the redundancy ensures that if one system were to fail, the other is there to save you.

Visibility is another massive factor, especially during those dark winter commutes. The Sirius comes equipped with a 50 Lux front headlight that is integrated directly into the stem. This isn't a cheap bicycle light strapped on; it throws a proper beam that illuminates the road texture ahead, not just the space directly in front of your tire. However, the real star of the safety show is the indicator system. The Sirius features turn signals integrated into the handlebar ends. This is a feature I wish every scooter had. Taking your hand off the handlebar to signal a turn on a scooter with small wheels is inherently unstable and dangerous. With the Sirius, you keep a firm grip, press a button, and bright lights signal your intentions to cars behind and in front of you.

Stability is the third pillar of safety here. The scooter rides on 10-inch tubeless pneumatic tires. We will discuss the comfort aspect later, but from a safety perspective, larger tires mean better handling of potholes and tram tracks. Small 8-inch solid tires can get caught in cracks, sending a rider flying. The 10-inch rubber on the Sirius rolls over obstacles with much more authority. Furthermore, the tubeless design incorporates a level of puncture resistance that gives you peace of mind. Combined with the IP54 splash-proof rating, you have a machine that remains safe and predictable even when the weather turns grey and the roads get wet.

Performance

Let's talk about power, because the spec sheet only tells half the story. The STREETBOOSTER Sirius is rated at 500 Watts of continuous power, but the number you should really care about is the peak power, which hits an impressive 960 Watts (sometimes listed as 840 Watts depending on the specific regional tune, but the punch is undeniable). What does this mean for you? It means that when you hit the thumb throttle, the scooter doesn't hesitate. It has a torque of 32 Newton meters, which is quite high for this class. Acceleration is zippy and confident, allowing you to merge into bicycle lanes or cross intersections quickly before the light changes.

Hill climbing is where the "peak power" really shines. Many budget scooters will slow to a crawl or stop completely when faced with a steep incline. The Sirius is rated for an 18% gradient. In real-world testing, this means it can conquer most urban hills, bridges, and underpass ramps without requiring you to kick-assist. While a 100 kg rider might see a slight drop in speed on the steepest hills, the motor has enough grunt to keep moving. It feels robust, like a tractor that just keeps chugging along rather than a race car that stalls out.

Regarding top speed, the scooter is electronically limited to 22 km/h (often capped at 20 km/h to strictly comply with German road laws). While some enthusiasts might crave higher speeds, the acceleration curve up to that 22 km/h limit is where the fun lies. It gets to top speed quickly. For those interested in technical tinkering, there are aftermarket controllers (like the MountainTuning sets mentioned in some circles) that can unlock higher speeds, but out of the box, the Sirius is a law-abiding citizen. The ride feels controlled and precise; the controller modulation is excellent, meaning you don't get that jerky "on/off" feeling that cheap scooters often suffer from.

Design

The aesthetic of the STREETBOOSTER Sirius is best described as "monolithic." The designers went to great lengths to hide the industrial nature of the machine. You won't find ugly weld marks, exposed cables, or bolt heads scattered across the frame. The "no visible screws" marketing claim is largely true for the main body, and it results in a silhouette that looks incredibly sleek. Available in Matte Black, White, or Green, the finish is high-quality powder coating that resists scratches better than standard paint. It looks like a premium appliance, something you wouldn't be ashamed to park in the lobby of a nice office building.

The folding mechanism is a critical part of the design. It uses a robust latch at the base of the stem that can be operated in seconds. Once folded, the stem locks into the rear fender (or a catch near it), allowing you to pick the scooter up. The geometry is well thought out; the wheelbase is 85 cm, which provides a stable platform, and the deck is 17-18 cm wide. This width is crucial because it allows you to stand with your feet side-by-side or in a comfortable diagonal stance without feeling like you are balancing on a tightrope. The rubber matting on the deck is grippy and easy to clean, further emphasizing the practical nature of the design.

One design element that deserves specific praise is the integration of the battery compartment. On many scooters with removable batteries, the battery sits in a bulky box on the stem, making the steering heavy and the scooter look top-heavy. The Sirius places the battery in the deck. This keeps the center of gravity low, which improves handling, and maintains the clean lines of the frame. The battery compartment opens with a key, and the battery itself has a handle, making the "pit stop" to swap batteries feel mechanical and satisfying.

Comfort

Comfort on an electric scooter is usually dictated by two things: suspension and tires. The STREETBOOSTER Sirius opts to forego complex spring or hydraulic suspension systems. At first glance, this might seem like a disadvantage, but in practice, it is a calculated trade-off. Suspension systems add weight, complexity, and maintenance points (squeaky springs are the bane of scooter riders). Instead, the Sirius relies on high-volume, 10-inch air-filled tubeless tires. These tires act as a natural air suspension. Because they are tubeless, you can run them at slightly lower pressures to absorb road vibration without the immediate risk of pinch flats.

Riding over cobblestones or cracked pavement is surprisingly manageable. The large diameter of the wheels bridges the gaps in the road, and the air cushion dampens the high-frequency vibrations that usually numb your hands and feet. While you will certainly feel a deep pothole or a high curb drop, for general asphalt and paved paths, the ride is buttery smooth. The lack of mechanical suspension also means the scooter feels more "direct" and connected to the road, giving you better feedback on traction limits.

Ergonomics play a huge role in comfort as well. The handlebar height is 101 cm from the deck, which accommodates riders from 1.60m to 1.90m quite well. The grips are ergonomic and support the palms, reducing fatigue on longer rides. The thumb throttle is responsive and light, preventing thumb cramps. The deck length allows for shifting your weight around, which is essential for comfort on rides longer than 15 minutes. You aren't locked into one static position, which keeps your legs from getting stiff.

Range

Range anxiety is the number one enemy of the EV owner, and STREETBOOSTER tackles this head-on. The Sirius comes with a 36V, 9.4Ah battery (338 Wh) using 21700 cells-often referred to as "Tesla cells" because of their high energy density and reliability. The manufacturer claims an optimal range of 40 km. In the real world, as reported by the community and consistent with physics, a rider weighing around 80 kg, riding at full speed in mixed conditions, can expect between 30 km and 33 km. This is a very honest figure. Many competitors claim 60 km and deliver 20 km; the Sirius delivers very close to its promise.

However, the raw number isn't the best part-the swappable nature is. Because you can buy a second battery and carry it in a backpack or a specialized bag, your range is theoretically unlimited. A spare battery weighs significantly less than a whole scooter. If you have a 60 km commute (30 km each way), you can simply swap the battery halfway. This flexibility is invaluable.

Charging is also efficient. The charger brings the battery to 80% in just 2.5 hours. The final 20% takes longer to protect the battery chemistry (total time ~5 hours), but that quick boost to 80% means you can easily top up during a lunch break or a meeting. Since you can take the battery out, you don't need to drag a dirty scooter into your office or living room to charge it. You just walk in with the battery pack, plug it in like a laptop, and you are good to go.

Use and Practicality

Living with the STREETBOOSTER Sirius is generally a pleasure, provided you understand its physical characteristics. The most discussed aspect in user reviews is the weight. At roughly 20.3 kg, this is not a lightweight scooter. It is on the heavier side for a commuter. If you live in a fourth-floor walk-up apartment with no elevator, you will dread carrying this machine up the stairs every day. However, if you have an elevator or a garage, the weight is a non-issue and actually contributes to the planted, stable feel on the road.

The folding mechanism makes it practical for public transport, although its bulk means it takes up a bit of space on a crowded train. It fits easily into the trunk of a standard car (dimensions folded: 118cm x 55cm x 38cm). The "last mile" capability is excellent because of the quick fold. You can ride to the train, fold it in 3 seconds, hop on, and then unfold it at your destination.

The app connectivity adds a layer of modern practicality. You can check your exact battery percentage, track your trips, and most importantly, lock the scooter electronically. The immobilizer feature, combined with a password, makes the wheels difficult to turn, deterring casual theft. However, as with all scooters, a physical lock is still mandatory for street parking. The IP54 rating means you don't have to panic if you get caught in a light rain shower, making it a viable all-season vehicle for many climates.

General Assessment

The consensus in the electric scooter community regarding the STREETBOOSTER Sirius is overwhelmingly positive, particularly among those who value build quality over raw speed. It is frequently described as the "sensible choice." It doesn't try to be an off-road beast or a racing machine; it tries to be the most reliable vehicle in your garage. Owners praise the silence of the motor, the solidity of the stem (no wobble is a common praise), and the effectiveness of the brakes.

There is a strong sentiment that you "get what you pay for." While it is more expensive than the generic clones flooding the market, the lack of rattles, the high-quality connectors, and the thoughtful engineering justify the price tag for most users. The removable battery system is consistently cited as the primary reason for purchase, solving the charging infrastructure problem for apartment dwellers.

If there are complaints, they usually revolve around the weight or the desire for a bit more suspension on truly terrible roads. Some users also wish for a higher top speed, but they generally understand that the limitation is regulatory, not mechanical. Overall, the Sirius is viewed as a mature, polished product that has moved beyond the "beta testing" phase that many other scooters seem to be stuck in.

Who Is This Scooter For?

The STREETBOOSTER Sirius is the perfect match for the urban professional. If you wear a button-down shirt to work and don't want to arrive sweaty from a bike ride or covered in grease from a chain, this is for you. It is ideal for people living in apartments (floors 1-100) who have an elevator but no garage power outlet. The removable battery is a non-negotiable feature for this demographic.

It is also an excellent choice for heavier riders (up to 120 kg). The robust frame and high-torque motor mean it won't buckle or stall under a heavier load, which is a common failure point for cheaper scooters. It suits the safety-conscious rider who appreciates the turn signals and redundant braking systems.

Conversely, this scooter is not for the "weight weenie" who needs to carry their scooter on their shoulder for long distances. If you have to carry a scooter up 3 flights of stairs daily, look for something under 15 kg. It is also not for the speed demon looking to race cars; the 22 km/h limit is hard-coded for compliance. Finally, if you are on a strict budget and can't spend more than 400 €, this premium machine is out of reach.

Community Feedback - Pros

• Removable Battery System: Universally loved for enabling charging anywhere and extending range.
• Build Quality: Described as "tank-like," solid, and rattle-free.
• Customer Service: The 7-year spare parts guarantee and responsive German support are major confidence boosters.
• Hill Climbing: The 960W peak power surprises many users with its ability to tackle steep inclines.
• Turn Signals: Handlebar-end indicators are praised for increasing safety and visibility.
• Tires: 10-inch tubeless tires offer great grip and puncture resistance.
• Brakes: The combination of drum and electric brake is seen as reliable and smooth.
• Design: The "no visible screws" look is frequently complimented for being stylish and clean.
• Legal Compliance: German riders appreciate that it is fully road-legal (ABE) out of the box.
• App Integration: Simple but effective, especially the immobilizer function.

The aspect that owners rave about the most is undoubtedly the removable battery. In a market saturated with scooters that must be parked near a wall outlet, the freedom to lock the scooter in a bike shed or leave it in a car trunk while bringing just the battery inside to charge is a lifestyle changer. It transforms the scooter from a toy into a viable vehicle for people living in vertical cities.

Community Feedback - Cons

• Weight: At ~20 kg, it is heavy to lift, making it difficult for stairs or lifting into high SUVs.
• No Mechanical Suspension: On very rough cobblestones, riders miss having springs or shocks.
• Price: It is significantly more expensive than entry-level Xiaomi or Ninebot models.
• Kickstand: Some users find the kickstand a bit small for the size of the scooter, requiring care when parking on uneven ground.
• Display Brightness: A few reports suggest the display can be hard to read in direct, high-noon sunlight.
• Speed Limit: Non-German users often wish it came unlocked to 25 km/h or 30 km/h by default.
• Grip Tape: The rubber deck is easy to clean but some prefer the "locked-in" feel of sandpaper grip tape.
• Size: It is physically large, which is great for stability but bad for small elevators.

The most common gripe is the weight. It is the classic trade-off: you want range and a sturdy frame? You get weight. While the folding mechanism is good, nobody enjoys lugging 20 kg around. Potential buyers are consistently warned by the community to check their elevator situation before purchasing. If you can roll it, it's a dream; if you have to carry it, it's a workout.

Value for Money

At a price point typically hovering around 899 € (though sometimes found on sale), the STREETBOOSTER Sirius is an investment. It is not an impulse buy. However, when evaluating value, one must look at the Total Cost of Ownership (TCO). Cheap scooters often become e-waste after 18 months due to battery failure or lack of spare parts. STREETBOOSTER offers a 7-year spare parts guarantee. This means you can keep this scooter running for nearly a decade.

When you factor in the included features that are usually aftermarket upgrades on other scooters-like the high-quality lights, turn signals, and the sophisticated battery management system-the price becomes very competitive. You are paying for German quality control and after-sales support. If you use this scooter to replace a car or a public transport pass, it pays for itself in less than a year. It offers "peace of mind" value, which is hard to quantify but essential for a daily commuter.

Compared to high-end competitors like Egret or IO Hawk, the Sirius is actually priced quite aggressively. It sits in a sweet spot where it offers 90% of the performance of the super-premium brands but at 70% of the cost. It is arguably the best value "premium commuter" on the market right now.

About the Brand

STREETBOOSTER is a German brand that has carved out a reputation for seriousness and reliability in a chaotic market. Unlike many "drop-shippers" who simply slap a logo on a generic Chinese scooter, STREETBOOSTER is involved in the engineering and development of their vehicles. They are ISO9001 certified, which is a quality management standard that ensures consistency in their products.

The brand is perhaps best known for its customer service. In an industry notorious for ghosting customers when things break, STREETBOOSTER is famous for picking up the phone and shipping parts quickly. Their promise of keeping spare parts available for 7 years is a testament to their belief in sustainability and product longevity. They view their scooters as vehicles, not toys. The community trust in the brand is high, with many users upgrading from the smaller "One" model to the "Sirius" or "Pollux" because of their positive experiences with the company.

If you are interested in seeing what else they offer, you can check out the /en/pevpedia/escooters/brands/2swift page for more information on their lineup.

Specifications

• Weight: 20,3 kg
• Max Speed: 22 km/h (Road legal limited to 20 km/h)
• Range (Optimal): 40 km
• Range (Real World): ~33 km
• Motor Power (Continuous): 500 Watts
• Motor Power (Peak): 960 Watts
• Battery: 36 V / 9,4 Ah / 338 Wh (Li-Ion 21700 cells)
• Charging Time: 2,5 hours (80%), 5 hours (100%)
• Max Load: 120 kg
• Tires: 10-inch tubeless pneumatic (air-filled)
• Brakes: Front Drum, Rear Electric (with ABS/Recuperation)
• IP Rating: IP54 (Splash-proof)
• Dimensions (Unfolded): 114 x 55 x 117 cm
• Dimensions (Folded): 118 x 55 x 38 cm
• Price: ~ 899 €

Known Alternatives

While the Sirius is a fantastic machine, the electric scooter market is packed with options. Depending on your specific needs, you might want to consider the DUCATI PRO-III R. This scooter leans heavily into the sporting heritage of the Ducati brand. It often features a more aggressive design and sometimes higher performance specs, though it may lack the refined service network that Streetbooster offers in Germany. It's a choice for those who want their scooter to turn heads with Italian flair.

If range is your absolute priority and you don't mind a bit more bulk, the JOYOR Y10 DGT is a strong contender. Joyor is known for packing massive batteries into their frames, often offering ranges that far exceed the Sirius. However, the build quality and "polish" are generally considered a step below the German standards of the Sirius. It's the choice for the long-distance cruiser who prioritizes kilometers per charge over premium feel.

For those living in extremely hilly areas, the SOFLOW SO4 Pro MAX is the legendary hill climber. It uses a planetary gear motor that is significantly louder than the Sirius but offers torque that can climb walls. If the Sirius's 18% gradeability isn't enough for your local mountains, the SoFlow is the alternative. Also, consider the XIAOMI 4 Pro if you want to save money; it's the mass-market standard, reliable but less unique and harder to repair long-term. Finally, if you want to stay within the family, the STREETBOOSTER Comfort offers a similar experience, often at a slightly different price or spec point.

Check out these alternatives here:

• /en/pevpedia/escooters/2swift-board
• /en/pevpedia/escooters/acer-es-series-3
• /en/pevpedia/escooters/acer-es-series-4-select
• /en/pevpedia/escooters/acer-es-series-5
• /en/pevpedia/escooters/acer-es-series-5-select