Keiser M3 Indoor Spin Bike

The M3 Indoor Bike was introduced in 2006 and featured Magnetic Resistance, a Simple Self-Tensioning Poly-V Belt Drive, and a Display that showed the Power you were producing in Watts—all firsts in Indoor Cycling. It raised the bar so high, it took four years for our competition to respond. The M3 of today is also the beneficiary of over a decade of refinements, including the same power accuracy as the M3i. It features a four-way adjustable seat and a two-way adjustable handlebars. The M3 can be purchased without the Display if you so desire. Today, the M3 and its offspring are still the only Group Cycling Bikes built in the United States.

Eddy Current Resistance

An eddy current is an electric current in a conducting material that results from induction by a moving or varying magnetic field. On M Series equipment this is generated by two opposing magnets passing over the flywheel. The flywheel (a conductor) passes through the magnetic field generated by the two powerful magnets. By varying how much of the flywheel comes into contact with the magnetic field you can increase or decrease the amount of resistance for the rider. As no parts in the resistance system ever touch there is no wear on the system.

When the flywheel is turned in proximity of the magnetic field the eddy current is created. The flywheel acts like a conductor with closed circuits. The energy generated by turning the flywheel has nowhere to go, so as it resists it becomes more difficult for the rider to pedal. If the flywheel is in less contact with the magnetic field it’s easier to ride. The more of the flywheel that comes in contact with the magnetic field (the higher the energy that is being generated with each turn) the more difficult it becomes to ride.

The M Series Computer

While the M Series Computer is awake, the Backlight Sensor automatically detects ambient light levels in the room and turns on the Backlit Display when needed.

The M Series Computer is a powerful teaching and programming tool. It can assist both the instructor and the participant on the spin bike by providing immediate feedback as well as the ability to track on-going improvement. The computer on the indoor spin bike can be used as a motivating tool to engage participants in their workouts, as the more participants understand the components of a proper workout, the further they can fine tune their performance on the indoor spin cycle.

The M Series Computer displays:

1. Backlight Sensor
2. Cadence (RPM)
3. Power Output (Watts/Kcal)
4. Heart Rate (HR)
5. Elapsed Time
6. Current Gear (Resistance Level)
7. Odometer / Trip Distance

The M Series Computer display gives accurate and precise information instantly, and automatically. It will also display average ride calculations and total distance that has been put on the indoor spin bike machine. The Trip Distance feature was initially intended to be used by gyms and facilities to record how much an M3 indoor spin bike was used for a given time frame. The odometer does not reflect distance in terms of miles or kilometres, rather something in between. For every 20 turns of the crank arm the distance will reflect as 0.1 on the display. For every 200 turns of the crank arm the distance will reflect as 1.0 on the display. In the future, we may revise the computer’s algorithm to display a more recognizable distance, which will also be influenced by a rider’s pedalling effort or Power on the spin bike.