When doing steady-state rides, this isn’t particularly noticeable, but at the end of a hard interval it is a cruel extra effort to get the wheel turning again if you’ve taken a few seconds’ rest. That said, this is something most wheel-on turbo trainers struggle with and the Boost’s performance is around what you would expect.Įven with the flywheel’s mass inertia being just over nine kilos, it doesn’t take long for the rear wheel to stop spinning once you’ve stopped pedalling. Even when carefully set up with the right pressures, you can still get some wheel slippage when putting in a fast acceleration. The Tacx Boost isn’t particularly fond of hard sprints from low speeds. I think it would be quite difficult to get it to actually tip over, but if you’re after a rock-solid platform, this trainer certainly isn’t for you. One thing to note is that the trainer isn’t the most stable and the legs do flex quite a bit when putting in an out-of-the-saddle effort. Putting in some sprints, there was plenty to push against and the nonlinear resistance curve meant that I didn’t feel like I was going to spin out at the top end. However, if you do have the resistance up high and you try pedalling in a low gear, the ride becomes very choppy indeed. Set up like this, although not quite as fluid feeling as a direct drive turbo, the resistance has a good consistency to it and doesn’t feel like you’re riding through treacle. It really helps to choose a lower resistance setting on the switch and compensate for this by using the bigger gears on your bike. Hopping onto the Boost, the ride feel is reasonably good.