By As cities grow more crowded and eco-consciousness rises, electric bikes have become the future of personal transportation. Among the leading names in the e-bike revolution is Tern, a brand known for designing premium, compact, and performance-oriented electric bikes for urban riders.
One of its standout models, the Tern Vektron S+, often referred to as the Tern S+, represents the peak of intelligent e-bike design — combining cutting-edge automation, compact foldability, and exceptional comfort.
In this article, we’ll explore what the Tern S+ is, its key features, specifications, advantages, and drawbacks, and help you decide whether it’s worth the price tag.
What Is the Tern S+?
The Tern S+ is a folding electric bike designed for modern commuters who want convenience, speed, and sustainability in one package. It’s part of Tern’s popular Vektron series, renowned for portability and performance.
What makes the S+ unique is its automatic transmission system powered by Bosch’s top-tier motor technology and Enviolo Automatiq shifting, which automatically adjusts your gear ratio based on terrain and speed.
In simple terms, it’s a smart e-bike that shifts gears for you, adapts to your riding style, and folds neatly for transport or storage — ideal for city life.
Design and Build Quality
Tern is known for engineering excellence, and the S+ lives up to that reputation. Built with a hydroformed aluminum frame, it’s sturdy yet lightweight enough to carry or roll when folded.
Key Design Features:
- Folding mechanism: Folds in under 10 seconds for easy storage or commuting.
- Compact dimensions: Fits in car trunks, elevators, or under desks.
- High-visibility design: Reflective decals and integrated lighting for night rides.
- Ergonomic cockpit: Adjustable handlebar stem and seatpost to fit riders of various heights (4’10”–6’5”).
Every element — from the hinges to the cable routing — feels premium, built for daily use in urban environments.
Motor, Battery, and Performance
The performance heart of the Tern S+ lies in its Bosch Performance Line motor and Bosch PowerPack 500 battery, offering a powerful yet smooth riding experience.
Performance Highlights:
- Motor: Bosch Performance Line (250W, 65 Nm torque)
- Battery: Bosch PowerPack 500 (36V, 13.4Ah)
- Range: Up to 80 miles (130 km) per charge, depending on mode and terrain
- Top speed: 20 mph (32 km/h) — Class 1 e-bike
- Charge time: Approximately 4.5 hours for a full charge
The Bosch system delivers consistent power on inclines and through city traffic, making commuting effortless even on longer rides.
Automatic Shifting with Enviolo Automatiq
One of the most advanced features of the Tern S+ is its Enviolo Automatiq system, a fully automatic shifting technology.
Instead of manually changing gears, the system uses a continuously variable transmission (CVT) that automatically adjusts the gear ratio for optimal cadence.
How It Works:
- The system monitors your speed, torque, and cadence in real time.
- It seamlessly adjusts the internal hub gear ratio for maximum efficiency.
- Riders can customize their preferred pedaling speed through a smartphone app.
This means no more gear grinding or sudden shifts — just smooth, silent transitions whether you’re climbing a hill or cruising on flat roads.
Comfort and Ride Experience
Comfort is where the Tern S+ truly excels. The bike feels stable, agile, and responsive, even on uneven city streets.
Comfort-Oriented Features:
- Suspension seatpost: Absorbs bumps and vibrations.
- Balloon tires: Schwalbe Big Apple tires provide extra cushioning and grip.
- Ergon grips: Reduce wrist fatigue on long rides.
- Stiff frame geometry: Ensures power transfer without compromising comfort.
The S+ rides like a full-size commuter bike, not a small folding model — a testament to Tern’s innovative geometry design.
Technology and Connectivity
The Tern S+ integrates smart technology for a personalized experience.
Smart Features Include:
- Bosch Purion display: Shows speed, distance, battery life, and assist level.
- Bluetooth connectivity: Pair with the Enviolo app to adjust cadence preferences.
- Automatic gear control: Learns your riding habits over time.
- Integrated lighting: Front and rear LED lights powered by the main battery.
These features make the S+ feel more like a connected mobility device than just an electric bicycle.
Pros of the Tern S+
The Tern S+ offers a range of compelling benefits that justify its premium price:
✅ 1. Effortless automation: The Enviolo Automatiq system removes the need for manual shifting entirely.
✅ 2. Compact and portable: The folding frame allows easy storage in tight urban spaces.
✅ 3. High-quality components: Bosch motor and battery ensure durability and reliability.
✅ 4. Long range: Up to 80 miles per charge makes it practical for daily commuting.
✅ 5. Exceptional ride comfort: Ergonomic design and suspension deliver a smooth ride.
✅ 6. Environmentally friendly: A clean, sustainable transport solution for cities.
Cons of the Tern S+
Even with its impressive feature set, the Tern S+ has a few drawbacks worth noting:
⚠️ 1. High price point: As a premium e-bike, it costs significantly more than entry-level models.
⚠️ 2. Weight: At around 54 lbs (24.5 kg), it’s heavier than most non-electric folding bikes.
⚠️ 3. Limited top speed: Capped at 20 mph due to Class 1 regulations.
⚠️ 4. Maintenance complexity: Advanced automatic systems can be more expensive to service.
⚠️ 5. Availability: Stock can be limited depending on region.
Despite these, the S+ remains one of the most advanced and refined folding e-bikes in its class.
Who Is the Tern S+ For?
The Tern S+ is designed for urban professionals, commuters, and city dwellers who value performance, convenience, and smart technology.
It’s perfect if you:
- Commute daily in urban areas and need a compact, foldable bike.
- Want an automatic, low-maintenance ride.
- Value premium engineering and reliability.
- Need an e-bike that fits into small apartments, offices, or vehicles.
While it may not be ideal for off-road adventures or budget buyers, it’s a dream come true for serious city riders who want a luxury-level e-bike experience.
Conclusion
The Tern S+ isn’t just an electric bike — it’s a fusion of cutting-edge engineering and intelligent design built for modern mobility. Its seamless automation, long range, and compact folding frame make it one of the most versatile e-bikes on the market.
While the price and weight might be deterrents for some, those who invest in the Tern S+ are rewarded with a premium, effortless, and future-proof commuting solution.
Whether you’re navigating busy city streets, climbing hills, or cruising along the waterfront, the Tern S+ ensures every ride feels effortless, smooth, and stylish.
If you’re ready to upgrade to a smarter, cleaner form of transportation, the Tern S+ is undoubtedly one of the best folding e-bikes you can buy in 2025.
FAQs
1. How much does the Tern S+ cost?
The Tern S+ typically retails between $4,999 and $5,999 USD, depending on dealer pricing and location. Its premium cost reflects high-end components and automation technology.
2. How long does the Tern S+ battery last?
The Bosch PowerPack 500 battery offers up to 80 miles (130 km) per charge, though range varies with terrain, rider weight, and assist level.
3. How long does it take to charge the battery?
A full charge takes approximately 4.5 hours using the standard Bosch charger, or slightly less with the fast charger.
4. Is the Tern S+ suitable for tall or short riders?
Yes. Its adjustable handlebar stem and seatpost accommodate riders between 4’10” and 6’5”, ensuring a comfortable fit for nearly everyone.
5. Does the Tern S+ require a lot of maintenance?
Not much. The belt drive and automatic shifting system minimize wear and tear. Routine checks and battery care are typically all that’s needed for reliable performance.
