Nautilus Exercise Bike U616 User Manual

Posted : admin On 10/5/2021

The top-of-the-line Nautilus ® U626 Upright Bike turns a routine workout into a multi-sensory experience that boosts power and endurance. It delivers a super smooth ride, yet shakes things up with dozens of workout programs, Bluetooth ® connectivity and app-based tools that make training entertaining and results easy to track.

  • Sep 09, 2016 Nautilus U616 Upright Bike is the upgraded upright exercise bike. It has some enhanced benefits over their U614 model. It looks like the same smart looking upright exercise bike. But it has more resistance levels (25), more pre-set programs (29 in total), bluetooth, 3 piece crank and more. It does come at a higher price to cover these.
  • View and Download Nautilus U616 assembly manual / owner's manual online. U616 Exercise Bike pdf manual download. Also for: U614, U686, U626, U618, R618.

The Nautilus U616 Upright Bike is an excellent affordable bike for home residential use. The Nautilus U616 provides a low impact cardiovascular workout with little impact on your joints. Furthermore, it has all the basic and advanced features that would enable a user to achieve his fitness goals.


How so might you ask? The U616 has features like the Bluetooth smart connectivity that allows a user to sync data with Nautilus ConnectTM, MyFitnessPal, and the Nautilus TrainerTM App. Its DualTrack display with two high-resolution, backlit LCD monitors is a beauty as it displays up to 13 different feedbacks.

The Nautilus U616 features a balanced flywheel, which creates a secure, quiet, vibration-free workout, as well as 25 levels of ECB magnetic resistance. ECB is the best type and silent form of magnetic resistance. There are ten resistance quick keys to go from smooth to hard.

The U616 provides 29 programs (12 profile; 9 are heart rate control; 2 are custom user-defined; 2 are fitness tests (1 Beginner; 1 Advanced); 1 quick start), and additional features. The Nautilus U616 Upright Bike is indeed one of the best mid-range models to take into account. It comes with everything you need for a challenging cardio routine and much more.

Product: Nautilus U616 Upright Bike

Price: For an excellent deal on this bike, merely go here on Amazon

Warranty: 10-year frame, 2-year parts, 1-year electronics, and 90 days labor

Nautilus exercise bike u616 user manual pdf

My rating: 8/10

Amazon Affiliate Disclosure: I may earn commissions on purchases made through links in this post.

U616 Frame construction

The Nautilus U616 100669 features a steel frame construction. However, the upright post of the seat with its slider is aluminum material. All the steel parts within the frame come with a corrosion-resistant paint finish.

The color used is black, as opposed to the older (2013) model, which had a light gray paint finish. The side base covers of the pulley, flywheel, and other resistance elements are ABS material.

The bike offers excellent overall sturdiness and stability. It weighs approximately 68.6 lbs (31.1 kg), which is twice the weight of the average road bike. This weight, plus your weight, add to the overall stability of the unit. Plus, the rear base is equipped with large, adjustable stabilizers, while the front base rests on two other rubberized pads which improve the unit’s grip on the floor.

The front bottom also has transport wheels which facilitate the relocation of the bike once you have finished your workout. By using these wheels, you won’t be handling more than 1/3 of the unit’s total weight.

The fully assembled bike isn’t huge. Its footprint is approx. 42″ x 22″ (106 x 55 cm), while its highest point is the top of the console which is approximately 58″ (146 cm) above floor level. Nautilus advises two feet clearance around the bike. Thus, allowing safe access and operation.


The Nautilus U616 comes with a high-comfort seat. The saddle integrates a thick layer of foam cushioning, which considerably improves its comfort. It is a saddle made for seated workouts, unlike the leathers included with many spin bikes, which are substantially slimmer. Nonetheless, you can still improve its comfort by adding an extra gel seat cover.

The seat has a standard attachment system to its slider. Thus, compatible replacements for it are widely available. Therefore, in the unlikely event that you would want to replace it, you should be able to find a fit model in any bike shop.

The seat offers 4-way adjustability. Its upright post features more than ten adjustment notches with approx. 1″ (2.5 cm) is in-between. Therefore, it should be able to accommodate users between 5’0″ and 6’5″ (153 – 196 cm) with no problem, promoting a complete and healthy leg extension during pedaling.

Plus, the seat’s horizontal slider offers several inches of front to back adjustment. It’s also durable enough to support users up to 300 lbs (136 kg).

U616 Handlebars

As opposed to other upright bikes, the Nautilus U616 also offers handlebar adjustability. The handlebar assembly is attached to the front mast into a metallic collar, which is tightened by a large knob. Therefore, you can untighten the knob, adjust the handlebar to the angle that you desire, and then retighten it back in its place.

The handlebar features a multi-grip design. It offers the possibility to adopt at least three grips, including parallel, standard, and race. Its side sections feature a layer of rubberized material to provide a secure grip. Its lower part integrates a set of metallic grip sensors that allow the console to monitor your pulse. Plus, the bottom corners of the handlebar come equipped with elbow pads, a feature that many upright bikes, or exercise bikes in general, do not include.

Resistance System

This Nautilus exercise bike has an eddy current (motorized-magnetic) resistance system. This means it requires a connection to a power source to allow resistance adjustments. All resistance adjustments are only adjustable from the console. Also, most of the onboard programs of the bike will automatically adjust the resistance, if selected.

An AC adapter is (included) with the bike. Its specs are Input:120V 60Hz, and Output: 9VDC, 1.5A. Its connector is at the front base of the bike. Batteries can not power the console.

The main resistance elements of the bike are a magnetic brake and a servo motor. As you adjust the resistance from the console, the servo motor will move the magnetic brake pad closer or farther from the flywheel, this way increasing or decreasing the intensity of the created magnetic field. This ultimately leads to more severe or lower pedaling difficulty.

The bike offers 25 distinct resistance levels. The first 5 deliver a very light resistance, great for users who need recovery training, or elderly users. Conversely, the 20-25 levels of resistance provide a pretty consistent pedal tension, simulating a steep climb, and allowing you to achieve a higher fat burn.

U616 Drive System

The Nautilus U616 comes with a 22 lbs (10 kg) internal flywheel, which has a perimeter-weighted structure, made to generate superior inertia during pedaling. It delivers a consistent momentum and a steady driving feel. It also allows pedaling in reverse; however, coasting is not possible on the bike.

The crankset features durable steel crank arms. However, it’s not for spin workouts. So, even though it may be solid enough to support your full weight during a standing up pedaling routine, this type of exercise is not recommended. This is, after all, an upright bike, made only for seated workouts.

The included pedals are a durable nylon material with a metallic core. They’re weighted so that they always self-adjust turning up when you remove your feet from them. They also have adjustable straps.

Finally, this Nautilus exercise bike features a belt drive system. It uses a heavy-duty rubber belt, resistant to stretching. Therefore, the internal drive system doesn’t need lubrication. Also, the belt generates considerably less vibration than a chain.


The Nautilus U616 features a different console than the previous model. It’s similar to the one on the Schwinn 170 MY17. It has a sleeker interface and offers greater visibility for the workout metrics than the previous model.

The bike’s console features a dual-display. The top larger display shows the profiles of the selected workout program, the chosen goal and your progress towards it, the name of the current workout program, the levels of incline and resistance, and the heart rate interval.

The lower display shows time, speed, distance, RPM, resistance level, calories burned, and heart rate. For the speed and distance parameters, the console offers the possibility to select either metric or imperial units. Also, not only that it can track your pulse via the integrated sensors, but it is telemetric.

Thus, it can communicate with various HR chest strap transmitters that operate in the 4.5 kHz – 5.5 kHz range.

U616 Workout Programs

The console integrates an impressive array of workout programs to keep you motivated. To begin with, it has a Manual mode, which allows you to select any tension level during pedaling. There are 12 preset programs designed for various workouts. Additionally, there is a Custom program that enables you to create your challenge and try to break your records with each exercise.

Furthermore, there are 4 Heart Rate program settings for 50-60%, 60-70%, 70-80%, and 80-90%; when one of these HR programs is selected, the machine will monitor your heart rate and auto-adjust the resistance to keep you within the chosen hr range.

Goal tracking is also available. You can select a goal track for a specific time, and the console will monitor your progress towards that goal. For example, you can choose a calorie goal for seven days, and the console will track how many calories you have burned towards that goal.

The console provides four user profiles. Therefore, you can save a goal tracking for each one of them. Or, four separate users can save their program settings and quickly select their program and workout parameters when they begin their workout.

Each user can also keep their weight, height, age, gender, and name, for a more accurate calorie count and progress tracking. Finally, in terms of programs, the console also has a Recovery function and a BMI function.


The console features do not end here, though. Just as the Nautilus R618, this one features Bluetooth connectivity and a USB port.

Thus, you can sync it with your smartphone or tablet to stream your workout data into your online fitness tracking account. It is compatible with various fitness apps, such as Nautilus Trainer 2, MyFitnessPal, and several others.

In case you don’t want to use the Bluetooth feature, you can still transfer your data online via a USB device. Also, the USB port of the unit doubles as a charging port for your tablet or smartphone.

As opposed to the older model, the console of this Nautilus exercise bike is compatible with the RideSocial virtual app. This is an online application that allows you to view and ride on a virtual trail on your smart TV, tablet, or phone, based on a GoogleMaps trail. You can create cycling events, ride alongside your friends, and benefit from many other interactive and fun features through it.

Additionally, the console integrates a sound system, a media shelf, and a cooling fan. The sound system is compatible with most MP3 players, smartphones, and tablets, consisting of two speakers at the lowest corners of the console. The media shelf is between the two displays of the console; it’s large enough to accommodate any tablet.

The workout fan, although it is not too overpowering, it does provide some cooling for your workout, and you can change its angle by tilting the console.

U616 Assemble and Maintenance

The base of the bike with all the drive and resistance elements comes pre-assembled. Therefore, you only need to add the base bars, the console mast, the handlebar, the console, the seat post, the seat, and the pedals.

This may take up to an hour, but the whole process is far from being complicated. The included manual provides clear assembly instructions and schematics. Also, an essential toolkit is (included).

For maintenance, it is recommended to periodically check the integrity of the unit, look for loose bolts or broken parts, etc. Any sweat drops that may fall onto the frame or console should be wiped dry. Internal maintenance is not required. All the internal parts come pre-lubricated from the factory.

Details and Specifications

  • Assembled dimensions: 41.8L x 21.6W x 57.6H inches (104L x 55W x 146H cm)
  • Assembled weight: 68.6 lbs (31 kg)
  • Supported weight: 300 lbs (136 kg)
  • Handlebar: 2-way adjustable, with pulse sensors
  • Seat: 4-way adjustable
  • Pedals: Weighted, with straps
  • Resistance: Eddy current, 25 levels
  • Console: 29 workout programs, Bluetooth, USB port, RunSocial compatible
  • Amenities: Speakers, fan, media tray, bottle holder,
  • Warranty: Frame 10 years / Parts 2 years / Electronics 1 year / Labor 90 days


  • Solid construction – can hold users up to 300 lbs;
  • Professional-looking design;
  • Adjustable stabilizers on the rear base;
  • Transport wheels on the front base;
  • Cushioned, 4-way adjustable seat;
  • Angle-adjustable handlebar;
  • Elbow pads included;
  • Pulse sensors integrated into the handlebar;
  • Smooth and quiet drive;
  • 25 levels of resistance;
  • 29 workout programs;
  • Four user profiles;
  • Goal tracking;
  • Nautilus Trainer 2, MyFitnessPal, Google Play, Under Armour and other online apps compatibility;
  • Compatible with the RideSocial virtual app;
  • Telemetric console;
  • Several amenities, such as 3-speed fan, sound system, media tray, USB charging port, bottle holder;
  • AC adapter included;
  • Easy to assemble;
  • Maintenance-Free;
  • Excellent warranty.


Nautilus U616 Upright Bike Manual

  • A tablet placed on the table holder will cover the top display;
  • An HR chest strap is not (included);
  • The cooling fan is not too overpowering.

Nautilus U616 Summary

The Nautilus U616 is an upright exercise bike offering 25 levels of eddy current resistance, 29 onboard workout programs, Bluetooth connectivity, and compatibility with the Nautilus Trainer 2 and RideSocial. It’s a heavy-duty bike, pretty close to light-commercial quality.

Nautilus Exercise Bike U616 User Manual Instructions

It also offers superior micro-adjustability and a wide array of amenities, such as a sound system, cooling fan, and tablet holder. It’s one of the complete upright bikes for home use, offering outstanding value for the price.

I hope you found this article helpful and informative. If you have anything that you’d like to share or any opinions about my website, please do speak up. I look forward to your comments, questions, and the sharing of ideas.

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