KEISER M3i Indoor Bike

More than 20 years ago, Keiser set out to create a bicycle that would exceed the demands of group cycling classes.

• A bicycle that adapts to cyclists of all body shapes and sizes
• A bike that achieves a quiet, yet true road bike experience inside your gym or at home.
• The ONLY bicycle manufactured in the USA to ensure the strictest quality control
• And the ONLY bike built entirely around YOU the rider, YOU the gym owner, and YOU the service technician

…And we achieved it all with the simplest engineering design.

Many manufacturers of indoor cycling bikes claim to have road bike expertise, but they don't understand what's important about road bikes: a frame that varies to fit riders of different sizes. Only we do.

BUILT FOR CYCLISTS OF ALL SIZES
The M3i fits riders from 4'10" to 7' tall (11473 mm to 2233 mm) with a weight capacity of 350 lbs (159 kg), making it ideal for various group cycling classes.

Other indoor bikes mistakenly place the rider's sweat zone directly over the handlebars and other vulnerable mechanisms, an obvious engineering flaw.

FIRST TO PUT THE STEERING WHEEL ON THE BACK OF A BICYCLE
The M3i is more reliable, easier to clean, and better protected from sweat and corrosion.

The angled channel directs sweat away from the drivetrain.
Superior sweat protection helps gym owners save money through lower maintenance costs and a longer bike lifespan.

It's easy to claim accuracy. Keiser guarantees it. As the FIRST to use magnetic resistance, we revolutionized indoor cycling by offering a quiet, reliable ride with instant, accurate data for EVERY M3i bike.

UNMATCHED QUALITY CONTROL
Every component of our axle assembly—the central piece responsible for predicting and delivering accurate ride data every time—is inspected to meet precise measurements. And every day, a production M3i bike undergoes random dynamic testing to ensure its quality and accuracy.

TRUE POWER READINGS
The M3i is the FIRST indoor bike to receive TÜV EN957-10 certification, recognized worldwide for its accuracy and safety. Most competing bikes are not TÜV certified.

IMMEDIATE RACE DATA
The M3i is the FIRST indoor bike designed to predict the power generated at any speed in any gear, ensuring that accurate riding data is always delivered instantly.

The competition backed Keiser's engineering by following our lead in the use of magnetic resistance, but they must have also copied our drivetrain design.

The simple M3i drivetrain, with a single Poly-V belt, produces the higher speeds needed for a lighter aluminum flywheel to provide the kinetic energy and magnetic resistance to simulate a good road bike experience.

Our competitors' outdated powertrains have to use a heavier, perimeter-weighted flywheel to achieve the same results. In fact, they boast about that, as well as their toothed belt drives and crank-to-flywheel ratios. But what they're really telling you is...

THEY DESIGNED THEIR BICYCLE WRONG.

A PEACEFUL AND GENTLE WALK
Our Poly-V belt design transmits very high loads over very small pulleys, achieving a great road bike experience without a perimeter-weighted flywheel, a more complicated drivetrain, and the noise and vibration of a toothed belt.

NO ADJUSTMENTS OR MAINTENANCE
The belt pre-tensioning design requires no adjustments and the drive train requires no maintenance other than routine inspection.

The poly-v belt is the choice of car manufacturers.
The M3i uses the belt, which is the preferred option for running accessories at the front of car engines because it is very quiet, durable, and reliable.

Many manufacturers talk about the distance between the pedals of their indoor bikes and boast about the narrow Q-factor. But their bikes were built around the narrow shoes and pelvises of elite cyclists, even though you can find people of all shoe sizes and body types in group cycling classes.

WHY NOT DESIGN A BICYCLE THAT FITS EVERYONE?

CURVED CRANKSHAFT ARMS THAT ACCOMMODATE WIDER HIPS AND BULKY SHOES
Instead of using straight connecting rods to achieve a tight Q-factor, Keiser recognized the need for versatility.

We added curvature to the M3i cranks to maintain the proper distance for wider hips and any type of footwear, from narrow cycling shoes to bulkier gym shoes.

Designed beyond consumer standards for group classes, it's more than a pedal: it's a game-changer, delivering superior comfort, safety, and durability.

DESIGNED FOR SPD RIDERS
Our M-series pedal ensures that the finger box remains parallel to the ground and clear of the floor surface.

To meet the needs of cyclists, gym owners, and maintenance technicians, we thought of everything when designing the Keiser digital system.

FIRST COMPUTER TO SHOW POWER
The M3i digital display is simple, with everything a cyclist needs to know on a single screen.

BACKLIT SCREEN
It turns on automatically when the room light drops below a set level and stays on, unlike other bikes.

NO BUTTONS
Eliminating inconveniences and causes of wear and maintenance.

TRACKING EACH TRIP
The FIRST bike to offer Bluetooth® with an open API, the M3i communicates with class-leading projection systems and simultaneously syncs data with cycling apps.

RECORD ALL DETAILS
Our M Series app easily records all the details of your trip so you can see your progress.

MANAGE EACH CLASS
Our M-Series instructor app displays live data from multiple bikes, allowing instructors to make real-time class adjustments.

ENHANCE YOUR INDOOR CYCLING INSTRUCTION WITH FTP TESTING, DYNAMIC TRAINING, AND MORE
With the Keiser M Series Group app offering functional threshold power (FTP) training, indoor cycling instructors can enhance their teaching capabilities to easily transform classes into fun and exciting competitions that inspire cyclists and keep them coming back for more.

ACCESS A WIDE VARIETY OF TRAINING OPTIONS
Use distance, power, and cadence to monitor performance, and the app won't lock you into any one type of class. Other group fitness apps simply don't offer such a wide variety of training options.

THE FEATURES OFFERED BY THE APPLICATION INCLUDE:
Unclassified walks
FTP test
Intervals (timed series)
Team challenges
Class summaries

The M3i features a wide range of details, benefits and features, offering added fit and comfort, increased durability and simplified maintenance.

SIMPLIFIED MAINTENANCE
The M3i drivetrain can be accessed by removing only eight Phillips head screws, compared to more than three times as many on some competitors' bikes.

STANDARD MEDIA TRAY
For holding mobile phones and tablets.

EASY ACCESS TO CHANGES
Mounted directly to the handlebars for ease of use and increased safety, especially when dismounting. Interval training is activated simply by pressing the shift lever up and down, making it ideal for HIIT workouts.

WATER BOTTLE HOLDER
Built into the frame design and fits small and large sizes.

WATER BOTTLE HOLDER
It's incorporated into the frame design and adapts to small and large sizes.

EASY-TO-ADJUST SEAT AND HANDLEBARS
Quick and intuitive vertical and horizontal adjustments of the seat and handlebars, as well as robust knobs that require less maintenance than a traditional cam lock.

ELASTIC PAD
Located at the base of the bicycle to facilitate stretching before and after riding.

LEVELER
The leveling foot can be adjusted by slightly lifting the corresponding corner of the bicycle and screwing the foot clockwise or counterclockwise.

EASY TO TRANSPORT
Fewer parts and a lighter steering wheel for easier transport.