The boom of cycling apps such as TrainerRoad, Zwift and The Sufferfest have created a cottage industry of smart trainers for the simple reason that the tool makes indoor riding so much more engaging.
When riding a virtual course on a smart trainer, if you begin to climb a hill the resistance ramps up and you have to pedal harder, just like when riding outdoors. This works with real-life POV video on apps such as Rouvy and FulGaz, as well as digital worlds like Zwift.
With a smart trainer, your pedal power drives apps like Zwift, which can in turn control the resistance for hills, drafts and structured workoutsBen Delaney / Immediate Media
When doing group rides or races on Zwift, the resistance gets easier when you are riding in a group, simulating a draft, and when you are alone in the wind.
Similarly, when doing workouts on something like TrainerRoad or The Sufferfest, a smart trainer automatically sets resistance to the exact prescribed wattage, so you don’t have to worry about gauging or pacing your effort.
So, there are key reasons to use a smart trainer: to make indoor riding much more fun and more productive.
How a smart trainer works
Smart trainers communicate on ANT+ and Bluetooth. ANT+ is cycling’s standard wireless frequency, so most bike computers, heart-rate monitors, power meters, speed/cadence sensors and such work on ANT+. Bluetooth is native on smartphones and many tablets and computers.
You can ‘drive’ a smart trainer with a newer bike computer, such as a Garmin Edge 520 or a Wahoo Elemnt. With this method, you can set the resistance at a particular wattage, complete a workout or ride a previous course.
What is a lot more interesting for most folks is to ‘drive’ the smart trainer with a cycling app.
With this method, you load the app on your smartphone, tablet or computer, then connect it to your smart trainer via Bluetooth or ANT+.
I recommend using Bluetooth for this connection because it is often more stable and it doesn’t require an ANT+ dongle. (The latest Samsung Galaxy has native ANT+, but most phones and computers do not.)
With most smart trainers, you need to plug them in — another difference from a standard trainer. How smart trainers generate resistance varies by model, with many using a combination of a flywheel (like a standard trainer for good road feel), magnetic resistance and an electronic motor/brake.
What you need to use a smart trainer
To get in the virtual cycling game, you need:
A computer, tablet or smartphone with native Bluetooth or an ANT+ USB dongle
A smart trainer
A big fan!
Two types of smart trainers
Smart trainers fall roughly into two categories: wheel-on designs and direct-drive models.
Wheel-on smart trainers look most similar to a normal trainer, where you clamp your bike at the rear axle and then tighten a drum against your rear tire for resistance.
This design is relatively lighter (sub 40lb / 18kg), relatively cheaper (models start at £279 / $349) and relatively easier to store, as the legs often fold up.
Wheel-on smart trainers are lighter, less expensive and generally a little more compactAllen Krughoff / Immediate Media
On the downside, wheel-on smart trainers require calibration each time you put your bike on them, which includes a 10-minute warm-up. And often, the power accuracy isn’t quite as good as on a direct-drive model.
Direct-drive trainers effectively replace your rear wheel, and offer very good power accuracyAllen Krughoff / Immediate Media
Direct-drive smart trainers are sturdy units that effectively replace your rear wheel. After installing a cassette, you pop off your wheel and mount the trainer on the direct-drive trainer.
Benefits of this design include stability, accurate power measurement and no need to warm-up before calibrating. The downsides? Cost and weight. Prices start at £699 / $899 and most of them weigh about 47lb / 21.3kg.