Magnetic resistance with 3 levels selectable by means of an easy and ergonomic slider on the roller incorporated magnetic resistance unit with latest generation neodymium magnets the parabolic rollers 85mm in diameter in the middle and 100mm at the sides make it easy to keep balance on the bicycle maximum control and ease of pedalling the wheel is guided towards the middle of the roller aluminium parabolic shaped rollers so you ride freely and safely with perfect balance platform incor