What is a continuously variable transmission (CVT)?

CVTs (continuously variable transmission) have quickly become the standard transmission in various popular models to help improve fuel economy, especially in smaller gas-powered cars and SUVs. But what is a CVT and what makes it different from a traditional automatic transmission?

In this guide, we’ll break down everything you need to know about CVTs, including how they operate and the CVT pros and cons you’ll want to consider when buying your next vehicle.

• What is a CVT? A pulley-based transmission offering smooth acceleration and better fuel efficiency, common in smaller cars and SUVs.
• Pros: Improved fuel economy, smoother ride, fewer parts and lighter weight.
• Cons: Less engaging to drive, higher maintenance costs and limited for high-performance or heavy-duty use.
• CVT vs. Automatic: CVTs are smoother and more efficient; automatics offer better performance and traditional gear shifts.
• CVT vs. Manual: CVTs focus on comfort and efficiency; manuals provide more control and engagement.
• Maintenance: Following the manufacturer's service recommendations is crucial for reliability.
• Who should choose a CVT? Ideal for fuel-conscious, city drivers that prefer a smoother ride.

A CVT is a gearless transmission system that uses a pulley and belt mechanism to provide smooth acceleration and optimize engine efficiency, improving fuel economy. Unlike conventional automatic transmissions that use a complex system of gears, CVTs operate in a much simpler way, eliminating that slight jolt you might feel when your car shifts gears.

At the core of most CVTs are two pulleys connected by a strong steel belt. One is connected to the engine and the other to a driveshaft that powers the wheels.

The transmission gets its name because of the pulleys' ability to change diameter. As you drive, a computer monitors your speed and acceleration and automatically adjusts the pulleys accordingly. When you need more torque for acceleration, one pulley gets wider while the other gets narrower. When cruising at a steady speed, the pulley diameters shift again to find the most efficient ratio.

This system eliminates the fixed gear ratios found in traditional transmissions. Instead of feeling distinct shifts as the car changes gears, CVTs provide a smooth, continuous flow of power. This design allows the engine to stay in its most efficient range for longer.

Just like most features, CVTs offer a balance of benefits and potential drawbacks, depending on your priorities and driving habits.

• Fuel economy - By allowing an engine to operate at its most efficient all the time, a CVT can improve fuel economy when compared to a multi-speed automatic or manual transmission, when keeping all other factors the same.
• Weight - CVTs are typically lighter than multi-speed automatic transmissions.
• Fewer moving parts - This reduces manufacturing costs and makes CVTs very reliable when maintained according to manufacturer recommendations.
• Smoother ride - Because a CVT’s design removes that feeling of the car shifting gears that you’d typically experience in automatic vehicles, passengers enjoy a much smoother ride that easily adapts to varying road conditions.

• Rubber-band feeling - Some drivers don’t like the feeling of lower torque at low speeds (though many automakers have compensated for that by having virtual gear steps that more closely mimic a multi-speed automatic transmission.)
• Maintenance and longevity - While modern CVTs are more reliable than early versions, they can require specialized, expensive fluid and potentially costly repairs or replacements if a major failure occurs.
• Limited use in high-performance vehicles - Although CVTs are efficient, they fall short in their ability to handle the high torque and horsepower of performance engines, making them less likely to be found in sports cars and heavy-duty trucks. That could change, however, as the technology continues to improve.

Choosing between a CVT and an automatic transmission can be tough, but it’s a decision you have to make for yourself since it’s very dependent on your unique preferences and priorities when shopping for a new vehicle.

• Driving experience: The most noticeable difference between CVTs and automatics is the way they feel. A CVT offers a smoother ride without the jolt of shifting gears you experience in an automatic due to its distinct shift points. If you’re used to that feeling, a CVT equipped vehicle might take some getting used to.
• Efficiency: Generally, a CVT offers better fuel economy than an automatic transmission because it can continuously optimize the engine's RPM to quickly adjust to changes in road conditions and speed.
• Complexity: A standard automatic is a more complex mechanical system with more moving parts than a CVT, meaning there’s more parts that could go wrong, Still, automatics have been around for a long time and are known to be a reliable option. While CVTs are much simpler, they do require specialized components and fluids.
• Performance: For everyday driving, both transmissions work well. But for high-performance use, traditional automatics (and especially dual-clutch transmissions) still have the advantage in power handling and driver engagement.

• Complexity: Manual transmissions are mechanically simpler than CVTs, consisting of a set of gears and clutch mechanism operated by the driver. With fewer components, there’s less risk of intricate mechanical failures. CVTs, on the other hand, rely on variable pulley systems and require specialized parts, making maintenance more complex.
• Performance: Manual transmissions give you more control over your vehicle’s performance, allowing you to actively manage gear selection and power delivery. CVTs are designed to do all of that for you, making them smooth and efficient, but less exciting to drivers who’d rather handle it themselves.
• Efficiency: CVTs are designed to optimize engine performance by maintaining an ideal powerband, which can mean better fuel efficiency during regular driving. Manual transmissions have the potential to perform similarly but only with a highly skilled and attentive driver behind the wheel.
• Driving Experience: Operating a manual transmission is more hands-on and engaging than an automatic or CVT because drivers are given full control of the vehicle’s power delivery — something fans of this transmission style enjoy. CVTs instead deliver a more relaxed experience that prioritizes comfort and convenience over driver engagement.

Advancements in technology and design mean many of the concerns experts had with early CVTs are no longer so worrisome. With stronger materials and improved engineering techniques, modern models have improved reliability and long-lasting performance.

That said, driving style and maintenance habits can impact CVT reliability. While they’re great for everyday driving, heavy towing and extreme conditions are better left to the other transmission styles. Staying on top of manufacturer service recommendations is very important to ensure your vehicle continues to operate as it should.

Like many decisions made when shopping for a vehicle, whether a CVT is best for you depends on your preferences and driving style.

A CVT can be a great choice if you:

• Consider fuel economy to be one of the most important factors.
• Do a lot of city driving and value a smooth, comfortable ride.
• Want seamless acceleration without feeling gear shifts.

A traditional automatic might be a better fit if you:

• Enjoy the feel of a car shifting through gears.
• Are considering a high-performance or heavy-duty vehicle.
• Prefer a more traditional driving experience.

A manual transmission may be perfect if you:

• Are a performance vehicle or sports car enthusiast.
• Like having full control over your vehicle’s power delivery.
• Enjoy taking on a more active role in your driving experience.

The best way to decide whether your next vehicle should have a CVT is by taking one for a test drive. Your local Enterprise Car Sales dealership offers a wide variety of CVT cars and SUVs from multiple brands and our knowledgeable sales consultants are on hand to help answer your questions.