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ASUNA 5150 Magnetic Turbo Commercial Indoor Cycling Bike

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ASUNA 5150
asuna 5150 - magnetic indoor cycling bike
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350 lbsManual
Frame: 5 years
Parts: 180 days

The ASUNA 5150 is one of the newest and heaviest exercise bikes from Sunny Health & Fitness for 2017. It’s a bike somewhat similar in specs with the Schwinn AC Performance, but costs about $1,000 less. It’s a commercial grade exercise bike, with an extremely sturdy construction, definitely built to sustain any type of spin workout.

Technical Details and Specifications

  • Assembled dimensions: 49L x 23W x 49H inches (125L x 59W x 125H cm)
  • Assembled weight: 112 lbs (50.8 kg)
  • Flywheel weight: 37.5 lbs (17 kg)
  • Supported weight: 350 lbs (159 kg)
  • Handlebars: 2-way adjustable
  • Seat: 4-way adjustable
  • Pedals: Dual-action (SPD clips + toe cages)
  • Drive mechanism: Chain
  • Resistance: Magnetic, 8 levels
  • Fitness meter: Not included
  • Bottle holder: Included
  • Warranty: Frame 5 years / Parts 180 days

Drive and resistance

As opposed to the ASUNA 5100, this Sunny exercise bike features a chain drive. This type of drive comes with several benefits. One, the chain is made of steel, being much more solid than a belt, and doesn’t stretch. Two, the chain is identical to a road bike chain, thus if it breaks or sunny asuna 5150 - 8 levels of magnetic resistancecatches rust you can easily find a replacement for it at your local bike shop. Three, the pedaling motion is quiet and smooth, similar to riding a road bike. Of course, as opposed to a bike with a belt drive, you will have to lubricate the chain periodically. But that’s quite a simple task.

This indoor cycle trainer is equipped with an extremely sturdy 3-piece crankset, with solid steel crank arms, made to support users up to 350 lbs (159 kg) in complete stand-up pedaling routines. It can basically withstand just about any spin workout. The crank arms are equipped with heavy-duty, dual-action metallic pedals. They have SPD clips on one side, and toe cages on the other. They also have standard threads, therefore you can easily find replacements for them if needed. Also, the bike has a narrow Q Factor, which supplies a comfortable ride, without any lateral stress on the knees.

The flywheel is made of a steel and aluminum combo. It weighs 37.5 lbs (17 kg). It’s not the heaviest flywheel found in spin bikes; for example, the BodyCraft SPX has a flywheel of 46 lbs (20.8 kg). But nonetheless, the flywheel on this Sunny ASUNA model is heavy enough to deliver a consistent momentum. Also, most of the steel in its construction is in its perimeter. Therefore, the pedaling motion excels in stability.

Pedaling in reverse is possible. However, when pedaling in reverse, the bike retains its resistance. In other words, when pedaling in reverse you will benefit from the selected level of resistance. This adds quite a bit of diversity to the available workout spectrum.

As opposed to many other gym grade exercise bikes, such as the Star Trac Spinner Blade, or Spinner NXT, the ASUNA 5150 features a manual magnetic resistance system. This resistance system consists of a set of magnetic elements connected to the tension knob situated on the main tube of the frame. Buy turning the knob clockwise, the magnets will cover a wider portion from the flywheel generating more resistance.

The bike offers 8 resistance settings. The first ones make available light workouts, perfect for warm-ups or for users who require recovery training. Conversely, the top resistance settings simulate a steep climb, offering the possibility to undergo extremely intense pedaling sessions, interval training or strength training.

Seat and handlebars

Like most spin bikes, the Sunny ASUNA 5150 is not a model designed for comfort. It’s equipped with a slim seat, similar to the ones on most spin bikes. It’s not a comfortable seat, itasuna 5150 - 4-way adjustable seat does not integrate any air cell cushioning. However, its surface is contoured and integrates a layer of padding. Its ergonomics can be bolstered though, via a gel seat cover for example.

The seat offers 4-way adjustability, up, down, front and back. It’s angle can also be adjusted. Its upright bar offers a 12-inch (30.4 cm) adjustment span, and can accommodate users with an inseam between 27″ and 41″ (68.5 – 104 cm), basically users of all sizes. Its horizontal adjustment bar offers 9 adjustment positions, with a span of approx. 8″ (20.3 cm).

The handlebar features a multi-grip design, including an aerobar and a bottle holder. It’s completely covered with rubber foam material to deliver a comfortable, sure grip. It’s only 2-way adjustable, up / down, its adjustment span being 4″ (10 cm).

Both seat and handlebar are easy to adjust, featuring knobs easy to grip and turn. Differently put, it takes less than a minute to position them as your workout demands.

Frame construction

Most gym grade spin bikes feature a frame made of steel tubing, and the ASUNA 5150 doesn’t make an exception. It’s build on a heavy-duty frame, approx. three times heavier than a sunny health and fitness - asuna 5150mountain bike, with a total assembled weight of 112 lbs (50.8 kg). Needless to say, this weight plays an important role in the bike’s overall stability. Differently put, this exercise bike can support all kinds of spin workouts, without wobbling or tipping to the side.

Both bike’s bases are equipped with adjustable, rubberized foot levelers. These can help you achieve maximum stability for the bike, even if you don’t place it on a rubberized mat, also offering a certain degree of protection for the floors. But still, since the bike is not exactly light, it’s recommended to place it on a mat. This will also prevent perspiration, or oil from the chain (if it was recently lubricated) to drip onto the floor.

The front base tube integrates a set of silicone wheels. Thus, the bike is easy to relocate. By leaning it onto its front wheels, you will handle less than half its total weight.

This Sunny Health & Fitness exercise bike doesn’t take a lot of space. It’s only 49″ (125 cm) long, and 23″ (59 cm) wide. Therefore, it can easily fit even in a smaller room.

Finally, the frame is coated with corrosion resistant and scratch resistant paint. The colors used are gray for the main frame, and black for the seat and handlebar posts. The flywheel is also black, with a touch of cerulean blue. The ASUNA logo is also blue. These are the only colors available for this model at the moment.

Assembly and Maintenance

Most of the bike comes assembled. The chain, the magnetic resistance system, the flywheel and crank are already in their place. Therefore, in terms of assembly you only have to add the bike’s bases, the pedals, the seat and handlebars. This shouldn’t take longer than 30 min. The manual provides pretty clear assembly instructions. Also, all the tools required for assembly are included.

Maintenance requires the periodic lubrication of the chain, to prevent it to catch rust. Also, even though the bike is coated with corrosion resistant paint, it’s recommended that perspiration is wiped off from the frame or other parts, as it’s considerably more corrosive than plain water.

The Pros

  • Sturdy steel frame, commercial construction;
  • Superior stability;
  • High user capacity – 350 lbs;
  • Elegant design;
  • Ovalized tubing for the seat and handlebar posts which prevents them to turn sideways during more intense workouts;
  • Bases with adjustable rubber feet;
  • Silicone transport wheels;
  • 4-way adjustable seat;
  • The bike can accommodate a wide range of users, with an inseam between 27″ and 41″.
  • Multi-grip handlebar, with a fixed, solid aerobar and bottle holder;
  • Dual-action pedals, with SPD clips on one side, toe cages on the other;
  • Frictionless, quiet magnetic resistance;
  • Smooth and highly durable chain drive;
  • Heavy, perimeter-weighted flywheel for a consistent momentum;
  • Extremely easy to assemble;
  • Little maintenance required. sunny health & fitness - asuna 5150
  • Decent warranty.

The Cons

  • Exercise meter not included;
  • Handlebar only 2-way adjustable.


The ASUNA 5150 is a heavy-duty, commercial quality indoor cycle trainer. It features a sturdy frame, and crankset, being able to support users up to 350 lbs. It’s equipped with a smooth, frictionless magnetic resistance system, and a durable chain drive. It’s definitely a bike made for the whole range of spin workouts. It’s great for intense cardio training, stamina and strength training, intervals and weight loss. And finally, even though it’s not exactly an affordable bike, it’s still at least $5-600 cheaper than an authentic spin bike in this range. Therefore, it’s definitely a bike with an excellent price / value / quality ratio.

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