The HIIT Bike fan system is manufactured from industrial-grade ABS for long-lasting durability, and features multi-axial curvilinear blade design for maximum performance. Low-maintenance twin belt transmission provides an ultra smooth and quiet ride. Unlike other fan bikes, the HIIT Bike frame is not bolted together in key locations, it’s welded. We used 2 mm steel to provide maximum strength for the toughest riders – in fact, in testing we proved the frame can withstand more than 1,400 lbs of force! Perfect for people 4’11” to 6’8″ tall.