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Nautilus T616 Treadmill Review

Nautilus introduced their new T616 treadmill as an upgrade over their older model 100394. The new model (100672) has an improved console and an attractive black paint finish all over; but it’s much the same as the older model. Users can even get the older model as it’s still available.

The new T616 features a powerful motor, motorized incline, durable deck and an improved high-performance console. It can be said that it’s one of the best treadmills in this price range out there.

Published: February 7, 2020.

nautilus t616 1

Nautilus T616 Specifications

- Dimensions when assembled: 77.2 x 35.2 x 57.6 inches (196 x 89.4 x 146.3 cm) (L x W x H)

- Dimensions of tread belt: 60 x 20 inches (152.4 x 50.8 cm) (L x W)

- Weight: 215 lbs. (98 kg)

- Maximum user weight capacity: 300 lbs. (136 kg)

- Motor: 3.0 CHP

- Incline: Motorized, 0-15%

- Speed range: 0-12 mph

- Deck Cushioning: StrikeZone, 6-cell

- Warranty: 10 years on frame and motor, 2 years on mechanical and electrical, and 1 year on labor

Features of Nautilus T616


Since the Nautilus T616 is a quite weighty machine weighing almost 215 lbs. (97.5 kg), obviously it needs at least two people for transport and assembly. It’s advisable to assemble it in the same room where it will be used. Placing it on a rubber mat is also recommended to maximize its stability and prevent any damage to the floor, in case the floor is irregular.

The assembly itself is quite straightforward, as the deck comes already assembled with rollers, motor and belt in their places, and linked to the front portion of the metallic frame. Users will have to connect the console masts and console which shouldn’t take more than an hour. The tools required for the assembly and assembly manual are included in the package.


The Nautilus T616 is equipped with a 3.0 CHP industrial-grade motor. This continuous duty motor is made to perform efficiently without getting overheated or slowed down during extended workout sessions. It performs very well even if the user is close to the maximum user weight capacity and exercises at maximum speed. A small flywheel is used by the motor, which increases the overall stability of the rolling motion.


Deck is an important component of any treadmill that users should thoroughly analyze before buying. Nautilus T616 features an extremely durable deck which doesn’t bend even if the user has a weight up to the machine’s maximum user weight capacity of 300 lbs.

nautilus t616 running deck

But it’s not even totally rigid because it has the StrikeZone 6-cell cushioning system containing 6 hexagonal suspension cells on each side, i.e. 3 on the front side and 3 at the backside of the deck. Due to this cushioning system, up to 30% of the workout impact on users’ joints is absorbed.

The deck is designed to facilitate running workouts and not only walking or light jogging. Since the running surface is quite spacious 60L x 20W inches, it is sufficient and comfortable for runners with a height up to 6’6″ – 6’7″ (198-201 cm).

A 2-ply belt has been used on the machine which is thicker and more durable than that of Nautilus T614 which has only a 1-ply belt. Large 2.5” rollers power up the belt due to which a high traction and excellent grip is delivered. They are there to increase the lifespan of the belt.


The console on the Nautilus T616 is almost multifunctional. Together with a consistent range of fitness functions and features, it offers many accessories too. The console has two DualTrack main LCD displays with blue LED backlight.

nautilus t616 console

The smaller one is at the top and shows the current user, their fitness score and users’ goals. There’s also a suggestive pacer icon above it. This smaller LCD display is an upgrade over the older Nautilus T616, and displays the USB stick connection, Bluetooth connection and whether the audio system is being used or not.

The larger display is at the bottom which shows a wide range of exercise metrics, including average time, heart rate, number of laps, speed level, calories burned, incline level and the profiles of the current program. Distance can be measured in km or miles, while speed can be measured in km/h or MPH. Time-per-Lap and Lap-Count functions are also present. In other words, a lap measures 0.25 miles (400m) and users can see how many laps they have completed and what their time per lap is.

The console also provides goal-tracking functions; so, users can set goals for time, distance and calories and monitor their progress toward these goals during workout.
The console is Bluetooth-enabled for easy data transfer. It can sync with another Bluetooth device, with the Nautilus Trainer fitness app. This way, users’ data will automatically be saved into their account. However, it’s not possible to listen to music on the machine’s speakers via Bluetooth.

Preset Programs and User Profiles

The console offers 26 preset workout programs, including 1 Manual, 3 Quick Goals, 3 Interval, 4 User Defined, 4 Heart Rate, 5 Weight Control and 6 Training Programs.

Also 4 different User Profiles can be set. Thus the machine can be used by multiple users or even one user can alternate between multiple goals. A User Profile program will need the user to enter data such as name, gender, age, height and weight, so as to provide an exact tracking for their calories and to interpret their fitness level better.

In addition to all this, the console is telemetry-enabled; so, it can read pulse via a chest strap transmitter, which is included in the package. However, EKG sensors are also integrated in the front handlebars of the machine.

The console also syncs with the free RunSocial App through which users can run through 19 locations and 27 routes from across the world in real time alongside people.

Step-up Height

The step-up height of the deck is around 9” (23cm). Plus, when it’s set up to the maximum incline, 6” (15cm) will be added to this height. Therefore, the ceiling height should be determined to use this machine safely by adding at least 20” (51cm) to user’s height.

Folding Design

The deck of the Nautilus T616 is foldable between its grips and it can be locked into place with a hydraulic cylinder. To fold the deck up, however, the user should be able to lift around 50 lbs. (23 kg) of weight. It also features a SoftDrop system due to which the deck slowly lowers when unfolded.


When unfolded the deck has a quite large footprint i.e. it takes up 77.2 x 35.2 inch (196 x 89.4 cm) (L x W) of floor space. Plus, a clearance should be maintained on all sides, particularly on the backside. This means that it’s not exactly suitable for a small room or apartment. However, the folded machine takes up a much smaller space.


The Nautilus T616 has two small feet fitted with caster wheels on the rear and the frame’s steel front base also has wheels. Thus, once assembled, the machine can be conveniently moved around with its deck folded.

treadmill mat

However, it is common practice to position the treadmill on the permanent location, preferably on the good treadmill mat in order to protect both the floor and the treadmill.

Incline System

The Nautilus T616 has an incline system that is motorized and console-controlled. The incline is from 0% to 15% which is a good range for a treadmill designed for home use. Although it doesn’t offer 30% or more incline like commercial treadmills, its incline can diversify users’ workout a lot.

Since the incline is motorized, it can be controlled only through the console. For this, gradual as well as quick adjustment keys have been provided. If users choose one of the present programs on the console, and if it involves incline, the incline will be adjusted automatically as per the selected program.


Just like the incline, speed too can be selected exclusively from the console. There are gradual as well as quick adjustment keys on the console for speed. Speed can be adjusted in the increments of 0.1 mph starting from 0.5mph up to a maximum of 12mph. This makes it possible for the users to find the perfectly suited speed for each workout.


As mentioned above, the console of the Nautilus T616 offers many accessories including a 2-speaker sound system, media tray, 3-speed cooling fan, two bottle/accessory holders and USB charging port.

The sound system is compatible with most smartphones, tablets and MP3 devices. It allows users to keep the music close without having to use ear-buds. The sound is not of excellent quality, but is quite crisp, compared to that of a phone’s or tablet’s speakers.

However volume adjustment keys are absent. So, users need to adjust the volume from their device. However, an ON/OFF setting for the sound is present.

The cooling fan is rather small and may not provide sufficient cooling during long-distance runs. However, it has 3 speed settings and can provide some cooling.

The media tray is placed between the speakers above the console displays. So, if a phone, tablet or book is placed on it, it won’t cover users’ fitness readings, such as they’re covered in some other machines. The tray is quite wide and can accommodate almost any tablet in landscape position.

There is also a USB port on the console for exercise data transfer. So, users can save their workout data on a USB flash drive and then copy it to their NautilusTrainer 2, MyFitnessPal or NautilusConnect account, and thus keep a better track of their progress. This USB port also acts as a charging port. Users can connect their device to it via the USB cable and charge it while running.

Electrical Requirements

The Nautilus T616 has a standard US 3-prong plug, but not an adapter. It needs a 120V 15A power circuit. It’s advisable to solely connect the machine to a power circuit without any other devices connected to the same circuit, in order to avoid power surges. Using a surge suppressor to safeguard the motor or console from getting damaged in case of a surge is also a good idea.


Users need to lubricate the belt of the Nautilus T616 every 25 hours of use with a silicone-based lubricant. Other than this, the machine requires only a little maintenance in terms of cleaning the belt and deck, in order to prevent any object getting caught by the belt and dragged into the rollers.

nautilus t616 2

Pros of Nautilus T616

- Sturdy construction

- 3.0 CHP motor for prolonged workouts

- Solid deck supporting users up to 300 lbs.

- Foldable deck

- StrikeZone deck cushioning which absorbs up to 30% of the exercise impact on joints

- Speed adjustments from 0.5mph to 12mph, in increments of 0.1 mph, offering the ability to find users’ perfect pace

- Motorized incline from 0% to 15%

- 26 preset workout programs

- 4 different user profiles

- USB port which can be used to charge users’ devices and for exercise data transfer

- Workout data can be transferred to multiple apps to track the progress

- Bluetooth-enabled console

- Many accessories like sound system, cooling fan, media tray and bottle holders

- Pulse sensors as well as telemetry-enabled console

- Heart rate chest strap sensor included

- Easy assembly

- Low maintenance

- Good warranty

Cons of Nautilus T616

- Heavy and bulky machine, pretty difficult to transport, handle and accommodate in a small space

 Nautilus T614 vs T616 vs T618 Treadmills

Nautilus T614, T616 and T618 are at first very similar treadmills, but they differ in several, very important details given in the following table:

Model Nautilus T614 Treadmill Nautilus T616 Treadmill Nautilus T618 Treadmill
Photo nautilus t614 table nautilus t616 table nautilus t618 table
 Bluetooth  No Yes Yes
Built-in Programs 22 26 26
Performance Tracking Goal Track Nautilus Trainer 2 Nautilus Trainer 2 
Mixed-Reality Training No RunSocial RunSocial
Running Deck 20 x 55 inches 20 x 60 inches 20 x 60 inches
Rollers 2.5 inches 2.5 inches 2.75 inches
Speed 0-12 mph 0-12 mph 0-12 mph
Motor  2.75 CHP  3.0 CHP 3.5 CHP
Maximum User Weight  300 pounds  300 pounds 350 pounds
Dimensions (L x W x H)  72.2 x 35.2 x 57.6 inches  72.2 x 35.2 x 57.6 inches 72.4 x 35.2 x 57.6 inches
Treadmill Weight 200 pounds  215 pounds 253.5 pounds
Incline 0-12% 0-15% 0-15%
Heart Rate Contact Sensors Contact and Chest Strap (included) Contact and Chest Strap (included) 
Cushioning System StrikeZone Deck Cushioning  StrikeZone Deck Cushioning  Rebound Deck Cushioning 
Belt 1-ply, 1.5 mm 2-ply, 2.0 mm 3-ply, 2.5 mm
Display Single Blue Backlit LCD Displays   Dual Blue Backlit LCD Displays Dual Blue Backlit LCD Displays 
 Warranty Motor: 10 years, Frame: 10 years, Mechanical: 2 years, Electrical: 2 years, Labor: 1 year  Motor: 10 years, Frame: 10 years, Mechanical: 2 years, Electrical: 2 years, Labor: 1 year  Motor: 15 years, Frame: 15 years, Mechanical: 5 years, Electronics: 5 years, Labor: 2 years. 
Amazon Link Nautilus T614 Treadmill Nautilus T616 Treadmill Nautilus T618 Treadmill

Note: Amazon affiliate links in the chart open in the new windows, feel free to check them for the most up-to-date offers and prices.

All three treadmills are great home treadmills, with strong motors, 0-12 mph speed range, large supported user weight, good cushioning systems, large number of built-in programs etc.

Nautilus T614 treadmill has the weakest motor (2.75 vs 3.0 vs 3.5 CHP) and the smallest running deck of 20x55 inches. But, it also supports users up to 300 pounds, just like T616.

Unlike T616 and T618, T614 doesn't feature Bluetooth connectivity and hence it lacks mixed-reality training (RunSocial App). However, it also has the option of transferring the data via USB port to Nautilus Connect and MyFitnessPal accounts.

Also, T614 doesn't support chest strap heart rate monitor - it has 'only' a contact sensors.

Nautilus T616 treadmill sits right between T614 and T618 regarding their features, performances, warranty and price. Although T618 comes with the highest price of all three models, it also offers the most of all three models.

Bottom Line

The Nautilus T616 offers an excellent price/quality ratio due to its powerful motor, sturdy construction, Bluetooth enabled console and great range of preset fitness programs. It’s a commercial grade machine designed for home use.

Since it’s a machine designed to withstand running workouts, and not only walking and jogging, it’s great for interval training, cardio and strength workouts, and even for weight loss. Users can actually burn up to 600-700 calories per hour by running on this treadmill.

For more reviews and recommendations feel free to check Nautilus T616 Treadmill Amazon link (link opens in the new window).


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