Cycleops Magnus Smart Trainer

CycleOps turned to the specialists at PowerTap when developing the Magnus. At +/-5%, it doesn't quite have the accuracy of a PowerTap hub, but it was developed with input from PowerTap and the end result was tested against the brand's hubs. It communicates those power numbers using ANT+ FEC and Bluetooth protocols, so it's likely already compatible with whatever head unit or training app-equipped device you prefer.

Of course, CycleOps does have its own app in the form of VirtualTraining, but if you're already committed to a program like Zwift, TrainerRoad, or others, then ANT+ and Bluetooth compatibility means the Magnus has you covered there, too. Regardless of your choice, the Magnus' ability to translate power and speed numbers into a virtual experience will let you map your workout

Though the Magnus' electromagnetic resistance unit is similar to other CycleOps models, it does ramp-up more quickly than the one used in—for example—the PowerBeam. That means interval work will be more rewarding because the increased responsiveness helps eliminate the dead time while the unit catches up to your power inputs.

The frame itself is based on CycleOps' Classic trainer frame, which the brand accurately—if rather cheekily—describes as "oh-so-sturdy." The frame is balanceable with eccentric feet that adjust independently of each other, so it adapts to accommodate lumpy concrete floors in properly Spartan pain caves.

CycleOps handles firmware updates via Bluetooth 4.0 devices or with an iPhone app, and—if you've recently updated your bicycle firmware to disc brakes—the brand also sells a thru-axle adapter to accept 142mm axles. The adjustable clutch knob and CNC-machined alloy roller accommodates virtually any combination of wheels and tires this side of 2.5in 29ers, though it's not compatible with 650c wheels. It also doesn't include a cadence sensor or an ANT+ stick.