Zwift Cog vs cassette: which indoor setup is right for you?

A cassette is the traditional set of rear sprockets fitted to a direct-drive smart trainer – the same as on your back wheel.

By contrast, Zwift Cog replaces the cassette with a single sprocket and works together with the wireless Zwift Click controllers, which mount on the handlebars and unlock virtual shifting, letting the trainer simulate gear changes instead of moving the chain across multiple sprockets.

Together, Zwift Cog & Click unlock up to 24 virtual gears on compatible trainers, giving riders a simple, consistent, silent shifting experience indoors.

These differences matter when you're choosing a new smart trainer, sharing one trainer between several bikes or deciding whether virtual shifting is right for your indoor setup.

They also answer a question many ROUVY riders have been asking: **do Zwift Cog & Click work with ROUVY? **Yes, they work with ROUVY as long as your trainer is compatible and the feature is supported.

A cassette setup uses your bike's existing drivetrain. Remove the rear wheel, mount the bike on the trainer and shift through the cassette using your normal gear levers, just as you would outdoors. Because you are using your existing gears, the cassette on the trainer must match the cassette on your bike.

Zwift Cog simplifies setup by removing the need to match cassette speeds with your bike's drivetrain. Compatible with virtually all 8- to 13-speed bikes, it pairs with Zwift Click, which mounts on the handlebars and provides virtual shifting on supported trainers.

What is a cassette on a smart trainer?

A cassette is the stack of sprockets normally fitted to your rear wheel. On a direct-drive smart trainer, the cassette goes on the trainer instead of the wheel, giving the chain something to run on when the bike is mounted indoors.

This is the setup many riders already know. You fit a cassette that matches your bike's drivetrain, attach the bike to the trainer and use your normal shifters. The rear derailleur moves the chain across the sprockets just as it does outside.

The key is compatibility. A cassette needs to match your drivetrain and some gear adjustment may be required for perfect shifting.

What is Zwift Cog?

Zwift Cog is a single sprocket that replaces a traditional cassette on supported smart trainers.

Zwift Cog includes ten chain alignment positions which allow you to find perfect alignment without the need for additional tools, or to adjust the gears on your outdoor bike.

Zwift Cog works in harmony with both Zwift Click controllers (a small wireless controller which mounts anywhere on the handlebars of your existing bike) and Zwift Ride, the all-in-one smart bike setup.

Zwift Cog replaces the cassette with a single sprocket. Compatible with almost any 8- to 13-speed bike, it removes the need to match cassette speeds with your bike's drivetrain, making setup much simpler for new users. Paired with the wireless Zwift Click, the trainer handles the virtual gear changes, so the chain stays on one sprocket while you enjoy up to 24 virtual gears. The result is a quieter ride and an easier way to swap between compatible bikes without changing cassettes.

How does virtual shifting work?

Above: virtual shifting in action. Using Zwift Click changes gears instantly without moving the chain between sprockets and gives you control of ROUVY from your handlebars.

Virtual shifting changes the trainer's resistance instead of moving the chain. Zwift Click sends a command, the trainer changes the virtual gear which is also displayed in the app.

On compatible setups, Zwift Click gives up to 24 virtual gears. That range can be useful if your bike has a narrow real-world gearing setup, such as a gravel bike with a single front chainring or a mountain bike with climbing-focused gears.

There is no derailleur movement or chain jump between sprockets. The trainer adjusts resistance instead, creating a smooth and direct gear change.

For ROUVY routes, this matters on rolling real-world terrain. Zwift Click lets you respond to changing gradients without reaching for the keyboard or tapping the screen, provided your trainer and control device are supported. Because the chain stays on a single sprocket, you can also shift under load without the chain moving across a cassette.

What are the pros of Zwift Cog & Click?

One benefit is bike swapping. If one trainer is shared between a road bike, gravel bike and mountain bike, Zwift Cog removes a lot of drivetrain matching work.

It also keeps the chain in one place, which can make indoor riding quieter. Fewer mechanical gear changes mean less chain movement across the rear sprockets. That can help if your trainer lives in a flat, shared room or any household where a 6 am interval session already tests diplomacy.

Zwift Cog is also useful for riders whose bike gearing is not ideal for fast indoor riding. A mountain or gravel bike with a small chainring may spin out too soon on downhill virtual roads with a normal cassette setup. Virtual gearing can provide a wider range of gear options without changing the bike.

For many new indoor riders, one of the biggest advantages is simply getting started. A smart trainer supplied with Zwift Cog & Click already installed works straight out of the box with virtually all 8- to 13-speed bikes. There's no need to work out which cassette speed your bike uses or buy matching components before your first ride.

What are the downsides of each setup?

Zwift Cog requires a compatible trainer to execute the virtual shift. Fortunately, most current trainer models are compatible.

Zwift Click gives riders a simple, consistent way to change gears. Because the chain stays on a single sprocket, each virtual gear change is handled by the trainer, delivering smooth shifting without the chain moving across the cassette.

A traditional cassette setup can have its own limitations. Some riders eventually discover that their easiest climbing gear isn't quite easy enough for long indoor climbs. When you're grinding up a famous pass at low cadence, having access to a wider virtual gear range can be a welcome option.

A cassette has its own annoyances. Different bikes may need different cassettes, spacers or freehub bodies. Moving a trainer between bikes can become a small workshop job when all you wanted was a ride.

Zwift Cog & Click can also make indoor riding quieter. Reducing drivetrain movement during gear changes helps keep mechanical noise to a minimum, which is especially welcome when you're riding early in the morning or late in the evening.

Which trainers are compatible?

ROUVY supports virtual shifting on selected smart trainers. The current ROUVY support page lists compatible trainers from Elite, JetBlack, Tacx, Van Rysel and Wahoo, including models such as Wahoo KICKR Core 2, KICKR Move and KICKR Version 6.

Zwift Click V1 and V2 are supported on compatible ROUVY setups. While the hardware has evolved, both versions provide the same core virtual shifting experience, where Zwift Click V2 offers increased control from the handlebars. Zwift Ride is also fully compatible with ROUVY. Zwift Play is not supported at the moment.

Zwift Cog works with most 8- to 13-speed drivetrains. It is not compatible with belt-drive bikes or internal gear hubs such as Shimano Alfine or Nexus.

Before buying, check your trainer model, drivetrain and firmware against the latest ROUVY compatibility list. Virtual shifting on ROUVY works through Bluetooth, not ANT+, so your device connections matter too.

Does Zwift Cog work with ROUVY?

Yes, Zwift Cog setups work with ROUVY when paired with a compatible trainer. ROUVY supports all versions of Zwift Click (V1 and V2), plus Zwift Ride, and our support page lists compatible setups.

That is good news for ROUVY riders who already own Zwift hardware, are looking at new smart trainer bundles, or wish to upgrade their compatible trainer with Zwift Cog & Click. You can ride real-world ROUVY routes with virtual gear changes rather than relying only on a traditional cassette setup.

• If you're comparing platforms before setting up your trainer, read our guide: best indoor cycling app comparison.
• For new riders building a routine around the hardware, the indoor cycling workouts guide is a good next step.

Which setup is right for you?

The first question is whether your trainer supports virtual shifting. If it doesn't, you can either continue to use your existing cassette setup or explore upgrading your setup to a Zwift Cog & Click compatible trainer here.

Once you have a compatible trainer, gear range becomes the main consideration.

Many riders start looking at Zwift Click because they run out of climbing gears on steep indoor routes. ROUVY includes plenty of long climbs where finding a comfortable cadence matters more than it might on flatter routes. Virtual shifting adds a much wider gear range than many standard cassette setups, making it easier to keep turning the pedals on sustained gradients.

Zwift Cog can be part of that solution, particularly if you want a simple setup that works across different bikes and drivetrains. The chain stays on a single sprocket, and all gear changes happen virtually through the trainer.

Riders looking for a dedicated indoor setup may also consider Zwift Ride. Unlike a traditional bike mounted on a trainer, Zwift Ride is designed specifically for indoor cycling and uses virtual shifting as part of the riding experience. It removes drivetrain compatibility considerations altogether, and is the ideal solution if you're looking for an always-ready indoor setup. A traditional cassette continues to provide a familiar mechanical shifting experience for riders who prefer that approach.