Keiser M3i Professional spinning bikeThe keiser M3i range are the most premium commercial spinning bikes on the market featuring a robust precision engineered frame, rear wheel positioning to protect against sweat and a modern console tracking time, cals, distance, watts and more These bikes are one of very few bikes in the world to stand the test of time in any environment and need minimal maintenance V shaped frame to accommodate riders of all body shapes and sizes from 410 to 7 tall.