The Tacx Flux S can replicate up to gradients of 10 per cent and has a maximum 2,000 watts of resistance power. I was also impressed with the cadence data provided by the Flux S, which matched my Vectors. Once again, impressive for a smart trainer at this price. Tacx claims that its power figures are within 3 per cent accuracy and that seemed to be the case when compared to the Garmin Vectors I was using. I measured the Flux S at 60db on an iPhone app, while pushing 200 watts, and at these noise levels you’re unlikely to upset anyone in the next room. While there is some noise, most of this comes from the transmission. The difference between modern direct-drive units and on-wheel trainers is huge, which is thanks to the flywheel design system. Noise levels or the lack of them impressed me too. At 23.6kg the Flux S feels rooted to the floor however hard you push it, whether in or out of the saddle. This is down to a combination of large footprint, well-placed legs and weight. The first thing I noticed is how stable the Flux S is, which impressed me with its budget-priced credentials. The Flux S pairs seamlessly with Tacx’s own app and works instantly with third-party software such as Zwift (which I used for testing) and TrainerRoad. As with most trainers these days it hooks up with smartphones, tablets, ANT+FE-C bike computers and connects via ANT+. There’s no need to purchase a cadence sensor however because this Flux offers that data out of the box.įitting a bike is a simple affair and a single lead plugs you in. It will also work with MTB and CX 135mm axles, 142mm, 148mm and there’s an adaptor available for 135 x 10mm. Simon Bromley / Immediate MediaĪs with most of the more affordable smart trainers on the market, there’s no cassette in the box, but Shimano and SRAM 8- to 11-speed cassettes fit directly, while a Campagnolo body is sold separately.
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