The Power Tech S4000 is a user friendly indoor training bike with a very competitive price tag. It offers all of the important features that you would find on the high end spin bikes used in your gym classes at a fraction of the price. To ensure a correct riding position is obtained the S4000 has a height adjustable handlebar & a 2 way adjustable seat position. Having the bike set up correctly is vital for a successful workout as it reduces strain on the knees & being comfortable will also enable you to train for longer. The tension is controlled by a simple turn of the tension knob. This works the same way as the gym studio bikes in that it applies friction to the flywheel & it also doubles as an emergency brake when pressed down. Just like the bikes in the gym the flywheel gearing is fixed meaning that the flywheel & pedals are directly connected allowing you to really build up the cadence even when you test yourself with higher tension settings. The 13kg flywheel is belt driv