Keiser M3i Lite Indoor Bike

V-Shaped Frame

Matches riders from 5’ to 6’2”

(1524 mm to 1880 mm) tall with a weight capacity of 350 pounds (159 kg).

Road-bike frames vary 
to fit riders of different sizes.

Keiser’s v-shaped frame mimics the sizing of different road-bike frames.

The M3i Indoor Bike’s seat and handlebars adjust for legs, torsos, and arms of different sizes.

EN957-10

Every day, an M3i production bike is randomly dyno tested to ensure quality and accuracy.

• True power readings. The first indoor bike to receive the globally recognized EN957-10 certification for accuracy and safety.
• Guaranteed Consistency Our relentless quality control procedures ensure that every M3i delivers the same immediate, accurate ride data, bike after bike after bike.

Self-tensioning Poly-V® belt drive

A quiet, smooth experience — and no maintenance.

Designed for Magnetic Resistance.

We designed the industry’s first indoor bike with magnetic resistance and a drivetrain. Then, we added it to our elliptical. The key to the M5 Series drivetrain is the Poly-V belt. It transmits high loads over very small pulleys. This enables M5 Series ellipticals to deliver a smooth, quiet experience. The Poly-V belt is perfect for transmitting high loads over very small pulleys.

Poly-V Belt

The choice of automotive manufacturers

The Poly-V belt is the preferred choice of automotive manufacturers. They use it to run the accessories on the front of car engines because it’s so quiet, durable, and reliable.

No required maintenance, zero adjustments

• Pre-tension design requires zero adjustment.
• Drivetrain maintenance other than routine inspection.

Avoids the problems of many indoor cardio equipment designs

• No complex, multi-belt drivetrain.
• No drivetrain noise and vibration from a cog belt.

Guided Tour

Explore M Connect Display

Learn how the M Connect Display provides the data and connectivity to help you get a better workout.

Rear-Flywheel Design

More reliable. Better protected.

Sweat can cause corrosion, require additional maintenance, and shorten bike life.

Keiser moved vulnerable mechanisms out of the “sweat zone”

By moving the flywheel to the rear, Keiser moved the bike’s drivetrain and other vulnerable parts out of the rider’s “sweat zone.”

• Reduces the need for more maintenance.
• Protects against corrosion.
• Extends the life of the bike.

Curved crank arms to fit every rider

We curved the crank arms on our indoor bikes to fit a wider variety of riders and their workout shoes.

M Series Pedal

Tested for over 30 million cycles at 290 lbs and 120 RPMs

Built to withstand the demands of group cycling

• Stronger bearings are tested under static and dynamic loads encountered when the rider mounts, dismounts, and rides the bike.
• Forged chromoly steel axle heat-treated for maximum strength.
• Standard workout shoes or cycling shoes with SPD cleats.

Guided Tour

The M Series Pedal

See how every detail is engineered to exceed industry standards. The result is not just a more user-friendly pedal. It’s also a more durable commercial-grade pedal.

Quick, Easy, and Convenient By Design. 

• Large, easy-turn height adjustment: Oversized knobs are easy to loosen and retighten. Pin plunger design is simple to operate, secure, and require less maintenance that cam-locks.
• Easy-to-adjust seat and handlebars: Quick, intuitive vertical handlebar adjustments as well as vertical and horizontal seat adjustments.
• Stretch pads: Facilitate pre- and post-ride stretching.
• Simplified maintenance: M Series drivetrain can be accessed by removing only eight screws versus over three times more on some competitors’ bikes. 
• Water bottle holder: Fits both large and small water bottle sizes. 
• Easy-access shifter: Handlebar-mounted design is easier and safer to operate — especially when riding out of the saddle. And the lever design is more intuitive and easier to operate than many knob-based designs. 
• Standard media tray: Removable media tray holds mobile phones and tablets.

Easy to transport

With fewer parts, a lighter flywheel, and precise weight distribution, M3 Series bikes are very ease to move. And their small footprint makes them easy to place and store.

Compatible with a variety of health 
and fitness apps

The M Connect Display can send your cadence, speed, power, and heart rate data to fitness apps.

Compatible with all major projection systems

The display can send rider data to leading projection systems — including Keiser M Series Group App. But while connected to a projection system, it can also share data with apps on a user's smartphone or tablet at the same time.

For all riders M Series App

• Graphic real-time ride data.
• Personalized metrics based on your profile data.
• Capture and save your full workout history.
• Guided workout sessions.
• FTP testing and estimation tool.

All the data a rider needs. connected.

• All the data you need Displays RPMs, watts, kcals, time, and distance on a single screen.
• Send ride data to devices. Connects via Bluetooth® to popular fitness and cycling apps, as well as major group cycling projection systems. Easily sync your data post-ride or in real time.
• Connect with a heart rate monitor.s Provides real-time heart rate data with broad compatibility across Bluetooth® monitors, including chest straps, watches, armbands, and other wearables.
• 24 Gears are designed to match the number of gears on many high-end road bikes.
• Interval training is easy to start and stop: push the gear shifter all the way down and back up.