![]() ![]() At the beginning of a warm-up and end of a warm-down, when you're only supposed to be putting out a few dozen watts, I found the Flux S simply couldn't provide resistance below about 80 watts. It's not good at delivering very low levels of resistance. Tacx claims the Flux S reads your power to an accuracy of +/- 3%, and that's consistent with my readings from the P1S in most situations. I spent 10 minutes just noodling around in Zwift to warm up both the Flux S and my PowerTap P1 pedals, did a calibration spindown on the Flux S and calibration adjustment on the pedals, and dialled up Jon's Mix on Zwift to provide a variety of efforts. It's significantly better than the Flux 1.0 and as good as the CycleOps Hammer 1.0. The Flux S has a smooth pedalling feel that's as close to feeling like you're actually riding a bike as any trainer I've used. Plug in an ANT+ dongle to your computer – Tacx makes an excellent one – fire up your chosen software and away you go. Trainers that use the ANT+ FE-C control and communication protocol are usually very easy to set up, and that's the case here. Calling this version the Flux S helps draw a line under that unfortunate episode. Tacx did about as good a job of dealing with the problems as anyone I've ever seen deal with a quality problem in the bike industry, but it unarguably hurt. The original Flux was plagued with reliability problems. It's now claimed to be accurate to 3% versus the original's 5%, but the original was better than 5% accurate anyway – as long as you got a good one.Īnd that's largely what's going on here, of course. In terms of overall function, it's true that the Flux S is largely unchanged from the original Flux. ![]() If you were cynical you might say that the Tacx Flux S is just a rebadged version of the original Tacx Flux smart trainer from a couple of years ago, but that's to underplay what Tacx has achieved here, with a high-quality wheel-off trainer for just over £500. It's still decent value, but it now has stiff competition from other budget direct-drive trainers. The successor to the original budget direct-drive trainer, Tacx's Flux S is easy to use, measures your power to a useful level of accuracy and consistency, and works with popular virtual riding applications such as Zwift to make indoor training less dull. ![]()
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