Of all the virtual reality bike trainers, the Tacx Fortius
The Tacx Fortius has something called a 'motor brake' which maintains the momentum you would have normally as you ride a bike. So if you're riding 'downhill' on this virtual reality bike trainer, you can rest a little more just as you would when actually riding down hill or in a draft. That's a great detail and sense of quality you can expect from Tacx bikes. In fact, the Tacx trainer series uses various brake systems: motor brake, magnetic brake, fan brake and electric bike for an accurate and powerful braking experience.
The Tacx virtual reality trainers work with your PC, which increases your motivation and endurance considerably. You can see a race displayed on your PC (different movies and virtual reality games are available) but more than that, your Tacx Fortius trainer transmits the effects of the environment in the movie onto your bike. So if you're going uphill you will feel a gradient change in your rear wheel and if you're going downhill, you'll feel it getting easier for you. You will feel bumps, air resistance, the difference between loose sand or wet grass and other real world situations. There are three types of Tacx Virtual Reality Trainers: the Fortius Multiplayer, The Fortius and the i-Magic. The Fortius Multiplayer T1930 is the most advanced trainer with a powerful engine break and manoeuvrable virtual reality steering frame. And get this, you receive a one-year license to race with multiplayers on the web. How's that for motivation!
The Fortius T1940 is the same but without the manoeuvrable virtual reality steering frame and the 12 month multiplayer license. Of course, if you buy the Fortius T1940, you can always purchase the steering frame and multiplayer web license later if you choose.
The I-Magic has an electromagnetic brake system so it's not quite the same braking effect as the Fortius and the Fortius Multiplayer.
Tacx bikes are shipped online at Amazon by the Niagara Cycle works company who have received 4.8 stars out of 5 on Amazon