Sportsmith Blog

How to Assemble a Keiser M3 Indoor Cycle

This video will demonstrate how to properly assemble your Keiser M3 Indoor cycle.


  • First you will need to cut away the outer box, exposing the inner box.
  • Next you will want to cut away the inner box exposing the parts. Be careful not to let the parts fall over and/or get damaged during this process.
  • Once you have the boxes cut away you will be left with one big mass of parts zip-tied and shrink wrapped together. Carefully remove the shrink wrap and cut zip ties and place the parts aside for future use.
  • After the parts have all been unwrapped and separated, carefully place the base frame onto the base frame studs. Make sure that the wheels on the base frame are facing the front of the cycle.
  • Install one washer and an acorn nut onto each of the base frame studs and hand tighten.
  • Using a 5/8” or 16MM crowfoot and torque wrench, torque the acorn nuts to 35 Foot Pounds. Be sure that all four of the acorn nuts have been set to the right torque.
  • Before moving on to this step make sure that the shifter lever is in the downward position.
  • Grab the five socket head cap screws and a 5MM Allen wrench. Now carefully slide the flywheel between the magnets and onto the hub at the same time. Holding the flywheel in place with one hand install the hub cap and align the screw holes. Make sure that the flywheel is flush against the hub and install the screws. Tighten the screws in a star pattern, as demonstrated in the video, until snug.
  • Note: You will need to turn the left pedal counter clockwise to install it, as it has left handed threads. The right pedal is standard threads and will need to be turned clockwise to install it.
  • The next step is to install the pedals. It is very important that you use the thread locker included. Once you’ve applied a couple of drops to the pedal, install the pedals by hand.
  • Torque the pedals with a 5/8” or 16MM crowfoot and torque wrench to 35 Foot Pounds.
  • The next step is to install the computer onto the frame. To complete this step you will just need a Phillips head screwdriver. Remove the screw from the frame as shown in the video and install it while holding the computer in place.
  • Note: take caution that you do not pinch the compute wires.
  • Once the computer is mounted the next step is to install the sweat cover.  To do so you will also need a Phillips screwdriver. Begin by removing the screws from the frame as shown in the video. Now slide the cover into place and re-install the screws.
  • The next step is to install the bottom slide. Using a 6MM Allen wrench remove the four screws from the frame as demonstrated in the video. Now hold the bottom slide in place with one hand and install the four hex head screws with the other hand.  Once they are all finger tight, torque them with the 6MM Allen wrench.
  • Next you will want to install the handlebars. Using just the red threaded portion of the L-handle (lever) and the spacer, attach the handlebars by finger tightening the spacer and threaded piece of L-handle through the slider from the bottom with the handlebars on top of the slider as shown in the video. Then re-assemble the L-handle. Once the L-handle is installed/assembled correctly you should be able to use it to loosen the handlebar and slide it to the best position for you.
  • The final step is to install the flywheel guard. Be sure to install the guard between the two notches in the frame as shown in the video.  Using the associated bolts install the guard to the frame at the bottom of the guard. Now use a 5MM Allen wrench to tighten the bolts into the frame.
  • The final step is to go over all hardware on the bike to make sure it is properly tightened.

Additional Resources:
Keiser Parts
Fitness Equipment Repair Support Forum



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