Body-Solid Endurance B4UB Upright Bike

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Endurance B4UB

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300 lbs96 lbsEddy
24 levels

The Endurance B4UB is one of the exercise bikes released by Body-Solid in 2019. It’s basically the upright version of the Endurance B4RB as it comes with the same console and has the same resistance system. It’s a light-commercial fitness machine, made for users of all levels.

Key Features and Specifications

  • Assembled dimensions: 47L x 22W x 55H inches (119L x 56W x 140H cm)
  • Assembled weight: 96 lbs (43.5 kg)
  • Weight capacity: 300 lbs (136 kg)
  • Seat: Cushioned, adjustable
  • Backrest: Mesh, non-adjustable
  • Resistance: Motorized magnetic, 24 levels
  • Console: 6 workout modes, 21 programs
  • Extras: Device holder, bottle holder
  • Warranty: Frame 15 years / Parts 3 years / Electronics 2 years / Wear parts 6 months / Labor 1 year

Frame construction

The Body-Solid Endurance B4UB upright exercise bike features quite a different construction than most other models. First of all, it has a bar that connects the seat tube and the front mast tube while providing upper protection and reinforcement for the drive unit. Second of all, the tube that holds the crankset and pulley (which is concealed by the plastic guards) is also welded to the base bar and to the top bar which considerably improves the structural strength of the frame.

All the steel frame parts are double-coated with a black paint finish. The only exception is the seat post which is chrome-plated. The bike also integrates several plastic parts. The most notable ones are the drive and resistance covers, the console casing, and the pedals. These are all made from a tough ABS polymer.

The Endurance B4UB is fairly large for an upright bike. Its net footprint is 47″L x 22″W (119 x 56 cm), while the top of the handlebars reaches approx. 55″ (140 cm) above the floor. Body-Solid recommends leaving at least 2′ (61 cm) of clearance all around the bike, though, for easy access.

The bike is pretty heavy, as well. Its net weight is 96 lbs (43.5 kg). This being said, the packaged unit should be carried by two people or at least by the use of a box trolley. However, once the bike is assembled, one user can handle and move it with ease. Its front bar stabilizer has two large transport wheels. Also, both stabilizers rest on large adjustable levelers.

Seat and handlebars

The Body-Solid Endurance B4UB upright bike is equipped with a pretty standard saddle. It is constructed on a nylon shell with a thick urethane cover and a layer of padding. It does not have a median groove like other types of bike seats and does not have super contouring. However, it is fairly large so it provides plenty of contact surface. It’s basically designed for optimal comfort.

The seat post features a triangular plate at the top and the saddle attaches to it via three screws. The seat is four-way adjustable (up, down, front, back). Its upright post has multiple adjustment holes while the horizontal slider adds a few more inches of front-to-back adjustment. Therefore, the bike should be able to accommodate users between 5’0″ and 6’5″ (153 – 196 cm). It can also support users up to 300 lbs (136 kg).

The bike’s handlebar features a multi-grip design. It offers the possibility to adopt three grips, such as an off-road grip, a climbing grip, and a standard grip. Its side grips feature PVC foam sleeves for improved contact. It is also equipped with metallic pulse sensors.

The handlebar assembly is non-adjustable. It attaches to the front mast of the bike via four screws which considerably improve its sturdiness. As we’ve mentioned above, its top grips reach approx. 55″ (140 cm) above the floor.

Resistance system

The Endurance B4UB upright bike is equipped with a motorized magnetic resistance system (or eddy current resistance). However, it does not have an internal power generator, like the LifeSpan Fitness C5i, for example. This means that you will need to connect it to an electrical outlet in order to power up its console and adjust the resistance. An adapter with cable is included with the bike and the connector for it is integrated into the front base of the frame.

The resistance elements are a small servo motor and a magnetic brake integrated into the flywheel system. The motor makes the connection between the brake and the console. Therefore, when you increase or decrease the resistance from the console, the motor changes the magnets’ pull on the flywheel which increases or decreases the pedaling difficulty.

The bike’s eddy current resistance system comes with a few advantages over a standard friction system. First of all, the magnets do not touch the flywheel. Thus, there is no wear-and-tear and you don’t have to worry about brake pad replacements. Second of all, the pedaling motion is almost completely silent.

The bike makes available 24 levels of resistance. The first few levels deliver a light pedaling difficulty, great for a workout warm-up, muscle toning, or even recovery training. On the other hand, the 20-24 resistance levels provide quite an advanced difficulty level, great for strength development.

Drive system

The Body-Solid B4UB upright bike is equipped with a belt drive system. It uses a poly-v belt designed for superior traction. It is completely concealed by the large ABS guards. Since it’s not a chain, you don’t have to worry about its lubrication.

The internal belt pulley is fairly large in diameter. The crankset is sturdy enough to support the user in a standing position. However, this is not recommended, as the bike is not made for spin workouts. The crank arms are steel-made with a chrome plating finish. The pedals are weighted so they always self-level when you remove your feet from them. They also have adjustable straps.

The exact weight of the internal flywheel is not specified. But since the bike’s net weight is 96 lbs (43.5 lbs), the flywheel probably weighs at least 20 lbs (9 kg). It has a balanced structure for a smooth pedaling motion and delivers a pretty consistent momentum.

The flywheel is bi-directional. This means you can also pedal in reverse on the bike. When pedaling in reverse, the resistance remains constant, given by the selected tension level. Also, you cannot coast on this bike; if you stop pedaling, the flywheel also stops.


The Endurance B4UB exercise bike comes with a multi-function console. It features an LCD display with blue LED backlight, divided into multiple sub-sections in order to show as many workout metrics at once. It tracks time, speed, RPM, distance, watts, calories, and pulse. Speed and distance be set either to metric units (km/h, kilometers), or imperial units (MPH and miles). Also, the unit can read your pulse either through the sensors integrated into the seat’s handlebars or from a wireless heart rate chest strap (not included).

The console makes available 6 workout modes with a total of 21 workout programs. Each workout mode has a quick selection key on the console. These are Manual, Program, Watt, HRC, Random, and Personal.

The Manual program allows you to exercise freely, adjusting the resistance as you like from the + / – buttons. If using this program, you can also set goals for time, distance, or calories. The Program mode covers 12 pre-set programs. These have various segment layouts, from hills and peak, to intervals. The Watt mode requires you to set a watt value to maintain during the workout.

The HRC mode has four heart rate programs, 3 of them are pre-set for 55%, 75%, and 90% HR, while the 4th one is custom. If using one of these programs, the console automatically adjusts the resistance depending on your BPM, in an attempt to keep you within the selected heart rate zone.

The Random mode will randomly create a program every time you initiate it. And finally, the Personal mode has 5 user profiles; each user can input their own data (age, gender, height, weight) for a better calorie and overall data monitoring.

It’s also important to mention here that the console does not have Bluetooth and it is not compatible with any fitness apps. It also does not have a sound system or a workout fan. However, it does integrate a small shelf that can serve as a tablet or phone holder.

Assembly and Maintenance

The base frame of the bike comes pre-assembled. You only have to attach the two base bars, the front mast, the seat post, the seat, the handlebars, the console, and the pedals. This may take more than an hour of your time, but the whole task is pretty straightforward. The manual provides clear assembly instructions with schematics and all the necessary tools are included.

For maintenance, you only have to keep the bike clean and periodically check for loose bolts and parts. The drive and resistance mechanism does not require lubrication or any other type of maintenance.

The Pros

  • Professional-looking design, light-commercial bike;
  • Sturdy frame – can support users up to 300 lbs;
  • Large padded seat;
  • The seat is four-way adjustable;
  • Multi-grip handlebar with pulse sensors;
  • Weighted pedals, with adjustable straps for extra stability;
  • Motorized magnetic resistance – 24 levels;
  • Multi-function console with a backlit LCD display;
  • 6 workout modes with a total of 21 workout programs;
  • 5 user profiles;
  • Goal settings for distance, calories, and heart rate;
  • The console is telemetric – can read pulse from a wireless HR chest strap;
  • Device holder included;
  • Bottle holder included;
  • Little maintenance required;
  • Easy to assemble;
  • All the necessary assembly tools are included;
  • Excellent warranty.

The Cons

  • Heart rate chest strap is not included;
  • No online connectivity.


The Body-Solid Endurance B4UB is a light-commercial upright exercise bike. It is equipped with a 24-level motorized magnetic resistance system, a 4-way adjustable seat, and a console with 6 workout modes and a total of 21 workout programs. It’s a bike for users of all levels, for light to intense cardio training, muscle toning, stamina and strength development, and weight loss. It’s not exactly the most affordable upright bike, but definitely offers excellent value for the price.

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