New ASUNA 5100 Magnetic Bike Review

ASUNA 5100 Magnetic Belt Exercise Bike

Exercise bikes are a fantastic way to get fitter and healthier as they offer a low-impact, safe cardiovascular workout.   Cycling on an exercise bike is not only good for weight loss, but with regular activity you can decrease your blood pressure and improve your heart health.   The Asuna 5100 bike can be used for both easier and harder workouts, but it comes into its own when used for spinning or interval training.

Our full ASUNA 5100 Bike review

The ASUNA 5100 Magnetic Bike is new on the market for this year.  The bike is made by long established SUNNY health products who have developed an excellent reputation for good value exercise equipment suitable for home use.

The ASUNA 5100 Magnetic Bike is one of the highest quality products that SUNNY have developed to date.  This review will focus on some the main features of the ASUNA 5100 Magnetic Bike including:

  • Steel frame and superior build quality
  • Sturdy bike while retaining sleek build for restricted living spaces
  • Adjustable seat and handlebar positions
  • Smooth and quiet pedaling
  • Magnetic resistance brake system to increase or decrease resistance
  • Partial assembly only required – about 20 minutes
  • A mid-range price for a high-range product

Who is the ASUNA 5100 Magnetic Bike For?

As this bike is specifically designed for spinning workouts and interval training, the ASUNA 5100 Magnetic Bike is great for people who want to take their exercise regime to the next level. A 45 minute ride can easily burn 600 – 800 calories.  Cycling three times week will certainly help you to get stronger legs, thighs and butt and burn fat.  The ASUNA 5100 Magnetic Bike is also an ideal winter training bike for outdoor cyclists who want to maintain fitness levels in the ‘off-season’.

Frame and Build

Sunny ASUNA 5100 Magnetic Exercise Bike

The ASUNA 5100 Magnetic bike is  a solid build and the frame is made of good quality commercial grade steel.  In fact, the only plastic parts on this bike are the belt guard and a few other protective components.  The bike is heavy and sturdy enough not to slip or move when doing a high intensity workout.

Feels like a high quality gym spin bike

The maximum user weight is 300lbs.

The lowest seat setting: 28.5″ (saddle to pedal) with the highest seat setting being 40″ (saddle to pedal).  Users who are 6’4″ have reported that is bike is comfortable for them to use.

The bike is a sleek design and will fit easily into the corner of a room or a small space.   It certainly takes up much less room than other cardiovascular equipment such as a treadmill or a cross-trainer.

See our other bike reviews here:  The best Spin and Indoor Cycling Bike Reviews of 2017

What makes the ASUNA 5100 Magnetic Exercise Bike different?


Sunny ASUNA 5100 Magnetic Exercise Bike

This stationary exercise bike is built with a 37.5lb flywheel.   While this is not the heaviest flywheel on the market, it is perimeter weighted which means it will provide a natural and smooth consistent cycling motion and a near silent operation.

The magnetic resistance works by turning the knob conveniently located below the handlebars.  When the knob is turned clockwise or anti-clockwise, more or less magnets will pass over the flywheel subsequently increasing or decreasing drag.  The advantage of this system is that there are no clunky gear changes or brake pads to wear out and that resistance can be changed subtlety and quickly to suit all fitness levels and workouts.  High resistances will provide a gives a truly heart pounding workout!


The pedal provided are reversible so you can use SPD clips or wear trainers with support from a foot cage.  With a specially coated non-slip surface, foot slippage is minimized and comfort and safety prioritized.


5100-3-180x180Comfort is a major factor when choosing a new exercise product.  We love that the ASUNA 5100 Magnetic Bike comes with a fully adjustable seat.  This will be adjusted not only up and down but forward and aft, allowing users to find the most comfortable seating position throughout their workout. The handlebars are also fully adjustable and are covered by rubber foam.   The ergonomic design of the handlebar allow multiple positioning options for a truly comfortable and natural ride.

There are 2 conveniently placed water bottle holders (bottles not provided).


Sunny ASUNA 5100 Magnetic Exercise BikeThe ASUNA 5100 Magetic Bike comes pre-assembled.  The main part of the bike (e.g. the frame, flywheel, resistance mechanism and belt) are already assembled when delivered for your convenience.  All you need to do is attached the pedals, seat, handlebars and the bases.  This takes roughly 20 minutes with minimal inconvenience.

The ASUNA 5100 Magnetic Bike has transport wheels attached to the bike so it can simply be tilted and rolled into a suitable location.


There is a 90 day warranty on the bike parts but SUNNY Health & Fitness now also provide a 5 year warranty on the bike frame

Do you need to know anything else? Here are the bike’s specifications:

  • Ideal for Commercial and Home use
  • Fully adjustable seat-Up,Down,Fore,Aft
  • Lowest seat setting: 28-1/2″ (Saddle to Pedal)
  • Highest seat setting: 40″ (Saddle to Pedal)
  • Height adjustable handlebar- Up, Down
  • Lowest handlebar setting: 39″ (Handlebar to Floor)
  • Highest handlebar setting: 43″ (Handlebar to Floor)
  • Features a drop down handlebar
  • Smooth and Quite Belt Drive Transmission
  • Adjustable Magnetic Resistance with press down brake system
  • Combination pedals – SPD clip and Cage
  • 37.5 lb cast steel and aluminum flywheel
  • Water bottle holders (2)
  • Built-in transportation wheels
  • Assembled dimensions:49″L x 21″ W x 47″ H
  • Maximum user weight capacity 300 Lbs

Alternatives to the Asuna 5100 Bike:

Product nameRating Price
ASUNA 4100 Commercial Indoor Cycling Bike, Gray ASUNA 4100 Commercial Indoor Cycling Bike, Gray
ASUNA 5100 Magnetic Belt Drive Commercial Indoor Cycling Bike Silver ASUNA 5100 Indoor Cycling Bike
ASUNA 5150 Magnetic Turbo Commercial Indoor Cycling Bike ASUNA 5150 Magnetic Turbo Commercial Indoor Cycling Bike
BodyCraft SPX Club Indoor Cycling Bike BodyCraft SPX Club Indoor Cycling Bike
Diamondback Fitness 510Ic Adjustable Indoor Cycle with Electronic Display and Quiet Magnetic Flywheel Diamondback Fitness 510Ic Indoor Cycle

What are Others Saying about the Asuna 5100?

Sunny ASUNA 5100 Magnetic Exercise Bike

This checks all the boxes and glides smoothly underneath me

Easy to assemble and super smooth sturdy ride

Any Negatives?

Due to the shipping weight of the bike (around 110lbs) it can be difficult to move into flats and apartments.

The bike seat is not the most comfortable saddle as it is designed to replicate a road bike and also be used as a spin bike (e.g. peddling in a standing position some of the time).  For extra comfort, you may wish to purchase a gel saddle like this one from Schwinn:

There is no in-built console with this ASUNA bike 5100 which means it can be difficult to monitor time, distance, calories burned etc.   However, with the growing popularity of wearable technology, such as Fitbits, that can monitor individual activity levels 24/7, this shouldn’t be an issue with most exercisers.

ASUNA 5100 Indoor Cycling Bike Review Summary:

This is the one of the best indoor/spinning bikes for home use that we've seen. With its exceptional build quality, it really feels like a gym bike.

If you are looking for a great way to work out in the comfort of your own home, then this is the bike for you.