M3 computer overview, M3 resistance overview, Average calculations – Keiser m3 User Manual
Page 2: Resetting ride averages, elapsed time and distance, Computer calibration, Understanding eddy current resistance, Power = force x velocity, Computer battery replacement, Line 1 rpm (cadence), Line 2 power

The M3 computer is a powerful teaching and programming tool. The computer can 
assist both the instructor and participant by providing immediate feedback as well as 
tracking on-going improvement. By experiencing objective cadence, power output, 
gears and heart rate, the cyclist benefits from a better overall and more effective 
workout. The computer can also be used as a motivating tool to engage participants 
in their workouts. The more participants understand the components of a proper 
workout, the further they can fine tune their performance. The goal is to work more 
effectively and efficiently, and achieve better results. 
Line 1 RPM (Cadence) -
The RPM display counts the cyclists revolutions per
minute on one crank arm. RPM is known in the cycling world as Cadence and roughly 
is the speed at which the cyclist is pedalling. At above 140 RPM the computer will not 
read and the word “STOP” will appear to indicate that the cyclist is pedalling faster 
than he or she needs to be. If the cyclist is out of the saddle and wishes to retain 
sufficient resistance pedalling should not fall below 60 RPM.
Line 2 Power -
The power output is displayed in Watts (currently generating)
and Kilocalories (total value for the ride). The computer toggles back and forth 
between Watts (displayed for eight seconds) and Kilocalories (displayed for two 
seconds) throughout the ride. 
Line 3 Heart Rate -
If there is no heart rate signal, a steady heart symbol and
a zero will be displayed. If a participant is wearing a heart rate strap, and once the 
computer locks onto the signal, the heart symbol will blink and display the heart rate. 
Please note that the heart rate strap must be Polar™ compatible and coded. 
Line 4 Pedaling or Elapsed Time -
The number shown reports the total time
spent cycling and will reset to zero after 60 seconds of inactivity or if computer is 
reset using the gear lever.
Line 5 Odometer/Trip Distance and Gear -
For the first eight seconds when
the computer is first activated, the odometer will display the total distance the cycle 
has been ridden. This feature is for service and maintenance purposes only. After 
eight seconds, the odometer will display trip distance and gears from 1 - 24. 
1
2
3
4
5
Average Calculations
To view averages: RPM (cadence), power, and heart rate at any point in the ride, stop 
pedaling for three seconds. This will flash your averages until you start pedalling 
again or until the computer goes to sleep after 60 seconds. 
Resetting Ride Averages, Elapsed Time and Distance
To reset your averages during the ride, stop pedalling for three seconds and the 
averages will start to flash, while they are flashing move the gear lever from bottom 
to top two times quickly. This will reset your ride information back to zero.
Computer Calibration
1. Cycle display must be blank. If the display is not blank wait
about 50 seconds until it is blank.
2. Activate the display by rotating the crank pedal. As soon as
it is active stop the crank movement.
3. Move the shifter from full retract (lowest resistance) to full 
advanced (highest resistance) at least five times. These five 
retractions must be done within five seconds.
4. Computer will indicate it is calibrated by showing “55:55”. If
you do not see the “55:55” start over from step # 1.
5. Retract shifter (lowest resistance) and computer should 
show gear “1”. Advance shifter (increase resistance) and 
computer should show gears changing “1” through “24”.
6. Continue beyond gear “24” and “88” will flash. This is the 
emergency brake area, where the end of the shifter is about 
1” to 1 ¼” off the top of the handlebar. If you do not see the
flashing “88” start over from step # 1.
Be
gin Calibr
ation
Calibr
ation Complete
M3 COMPUTER OVERVIEW
The Keiser M3 is a revolutionary new way to cycle, with a focus on power output. The 
understanding of the M3 resistance system can best be described in the explanation 
of eddy current resistance and the formula for power (Power = Force x Velocity).
Understanding Eddy Current Resistance
An eddy current is an electrical current in a conducting material that results from 
induction by a moving or varying magnetic field. On the M3, this is generated by 
the wheel passing through two opposing magnets. The flywheel (a conductor) 
passes through the magnetic field generated by the two powerful magnets. By varying 
how much of the magnetic field comes into contact with the flywheel, the amount of 
resistance will increase or decrease for the cyclist. This resistance system also allows 
the cyclist a smoother, quieter, and more predictable ride.
Another major factor that plays a role in resistance is speed. The faster the flywheel 
turns, the more energy is generated, and thus the more resistance is created.
Power = Force X Velocity
Power (amount of work being done in a given amount of time by the cyclist) = force 
(the amount of resistance) x velocity (the cadence the cyclist is pedaling). This is 
the same formula that all outdoor cycles follow. By pedalling faster the difficultly 
increases as the resistance increases. The same applies to the M3, at a set gear the 
resistance can be increased or decreased by adjusting the cyclists cadence. 
In this way the M3 cycle is very similar to outdoor cycling. The higher the gear, the 
higher the cadence the more power produced. 
Less
Re
sis
ta
nc
e
Rotating Magnet Housing
Cutaway Revealing Magnet
Flywheel
M
or
e
Re
sis
tan
ce
If the flywheel is in less contact with the magnetic field, it is 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 pedal.
Computer Battery Replacement
To test the computer batteries rotate the crank arm until the computer “wakes up”. 
If the battery is low, a “LO-BA” will display in the odometer (ODO) display at the 
bottom of the computer. To replace the batteries unscrew the back of the computer 
housing and remove old AA batteries and replace with a set of two new AA 
batteries. If you have multiple bikes, we suggest all computer batteries be changed 
at the same time.
M3 RESISTANCE OVERVIEW
Unscrew Here
Lift to Reveal Battery Area
