The 1st edition Flux gained great compliments and love for providing direct drive resistance at a low cost when compared to its competitors. Tacx designed the Flux to provide everything you needed from a trainer for those of us that aren't professionals and only need 1500w maximum rather than 2500w when compared to the Neo. One of the drawbacks with the original Flux was that it didn't fit long cage derailleurs and on occasion had been found to burn out too easily. So Tacx went to work to design the new Flux S that addresses both of those issues whilst still providing the same great value. It remains compatible with both Shimano and SRAM components and can reflect inclines of up to 10%. The Flux S has ANT+ and Bluetooth built in so that it can work with all your favourite 3rd parts apps such as Zwift. This trainer is the smarter way to train this winter.