The Jet Black Z1 Fluid HYDROGEL Trainer Features progressive resistance up to 900W for a workout that will test any level of cyclist. Our patented design has a HYDROGEL Roller with special gel composition creating a new type of contact between your bike and the trainer. The HYDROGEL Roller reduces noise by 55% and tyre wear by 25-30% - great for indoor training at home. The HYDROGEL Roller combined with the Fluid resistance unit gives a smooth, quiet ride with the ultimate on-road feel.