Adidas C-21 Self-Generating Electronic Exercise Bike Review

Adidas C-21 Exercise Bike Best Price
ProductPrice CheckOriginal PriceDiscounted Price
Adidas C-21GTR price checkingWAS £549CLICK HERE
Read more customer reviews here – Review stars 4 out of 5 (2)

The Lowdown

Adidas is a company that likes to be at the forefront of new technology. Self-generating power is an exciting concept. You can now work out at home without worrying about wires and cables. 
Like many other Adidas products, the C-21 Self-Generating Exercise bike has a lot to offer when it comes to exercising and working out at home.

But can a bike that needs you to power it still be a good option and give you the cardio workout you want? We take a look…

Adidas C-21 Self-Generating Electronic Exercise Bike Review

First Impressions:

The initial impression of the Adidas C-21 is that it is a sturdy bike. The design is upright with a comfortable, large seat. The console is well-positioned between the two large handlebars. 

Adidas has thought about many of the little extras including a water bottle holder and tablet-smart phone holder. The black frame complete with the Adidas logo helps to make the bike look contemporary and sleek. 

Both the handlebars and seat are adjustable. This makes it easy for you to find a riding position that suits you. 

The overall appearance is uniform. The components and materials are well-made. 

Once out of its packaging and assembled, it gives you the impression of a well-built bike. A lot of thought has gone into the overall design concept. 

Adidas has stuck to a classic exercise bike concept. In doing so, they have built a bike which looks great with exciting new features including Bluetooth and self-generating power. First impressions are very good on this feature-packed C-21 bike.   


The assembly process takes about 45-60 minutes and can be a bit fiddly, but after taking some time to follow the instructions, it was ok . The C-21 comes with an assembly guide complete with diagrams and all of the components you need. The bike weighs 43.9kg (6.9 stone) so wasn’t overly heavy to move around. Which helped to move it once assembled.

Although the assembly can be completed without a second person present, having someone to hold parts is handy. Once you have assembled the bike and added the batteries, you are good to go. Adjusting the handlebars and seat is easy to do once you have put the bike together. 

Design and Build Quality:

Adidas is known for its well-designed home exercise equipment. The C-21 is no exception. 

This is an exercise bike that looks well thought out from every angle. Compared to other bikes in the same category, it is sturdy but not oversized. 

The comfortable large seat gives the appearance that this is a bike you can ride on for many hours without developing a sore derriere. 

The build quality of the bike is excellent. As both the handlebars and seat are adjustable, the C-21 accommodates smaller size and larger size individuals. 

As you assemble the bike, the components feel heavy and well-made in the hand. Above average gauge steel contributes to the feeling of the build quality of the C-21. 
Quality materials have been used to manufacture all parts of the bike including handle bars, seat and stablisers. This is not a flimsy exercise bike.

The LCD display screen is slick and has all the information you’ll need to measure your workout- the buttons are easy to use and intuitive, so you can get cycling straight away! The location of the tablet/phone holder is good so it doesn’t get in the way of the main display, unlike other bikes we’ve tested.


  • Maximum User Weight 150kg
  • 24 levels electronic resistance
  • 20 User Programmes
  • MP3 and BlueTooth enabled
  • Chest strap included


  • Foot straps are slightly rigid
  • Higher price bracket.

Performance and Workout Experience

The 9kg flywheel offers plenty of scope when it comes to a challenging workout, and the 24 resistance levels that can be electronically changed through the display means this bike is suitable for a range of fitness enthusiasts.

The upper limit of the flywheel lets you challenge yourself. However, it has to be said that if you are a newbie, there is plenty of scope for making your workout more interesting at lower resistance levels. 

The bike feels like it effortlessly helps you to complete your workout. The performance of the flywheel is smooth and consistent. 

Even at high speeds and resistance levels, the C-21 makes you feel secure and safe. The front and rear supports do a great job even when you use high-intensity workouts.

Thanks to 20 programmes, there is plenty of choice when it comes to selecting a workout. From the easy-to-use console, you can choose from 12 preset programmes. 

You also have manual, target and recovery programmes along with 4 user profile settings. 

No matter what resistance level or programme you choose, the action remains smooth. The large seat makes working out on the bike comfortable. This comfortable feeling makes it likely you will probably spend more time using the bike for your home workouts. 

Although the adjustable pedal straps are slightly stiff, the pedals let you dig in and put extra effort into your workout. 

The 24 levels of resistance help you to better control your workout.

As you work out, you will not have a problem reading the console display. The characters are large and easy to read. Keeping an eye on speed, distance, time, calories, RPM, resistance level and pulse is easy to do. 

Things we really liked:

  • Adidas chest strap is included so you can measure your heart rate for more accurate workout feedback.
  • The audio quality is good. Establishing the Bluetooth connection only takes a matter of minutes. The console gives you all of the relevant feedback you need.
  • The bike is smooth and sturdy, but also easy to move around. Winner.

Final thoughts on the Adidas T-19i Folding Treadmill

This is an exercise bike that inspires confidence. The choice of available workout programmes is excellent. 

The addition of 4 personal profiles is a much-appreciated feature. This means the entire family can take advantage of what the C-21 has to offer. As the seat and handlebars are easy to adjust, the C-21 is a fantastic choice for a comfortable ride for all. 

The C-21 is well-built and designed for frequent and extended use. The performance is second-to-none and delivers home training with ease.

No messy wires are needed, as the exercise generates its own power. Thanks to its low weight and transportation wheels, you can move it around if needed. 
 When you are looking for an at-home training solution for yourself and other family members, the Adidas C-21 Self-Generating Electronic Exercise Bike is a top choice.

And without a plug in sight…!

Adidas C-21 Exercise Bike Voucher Code
ProductPrice CheckOriginal PriceDiscounted Price
Adidas C-21GTR price checkingWAS £549CLICK HERE
Read more customer reviews here – Review stars 4 out of 5 (2)
Colour Black and Red
Resistance24- electronic
User Programmes20
Max User Weight150kg


Build Quality
Value for Money
- Advertisement -

Top Rated Exercise Bikes

- Advertisement -

Deals and Discounts

- Advertisement -

Latest Articles

- Advertisement -
- Advertisement -

Related articles

Adidas C-21 Exercise Bike Best PriceProduct Price Check Original Price Discounted PriceAdidas C-21WAS £549 CLICK HERERead more customer reviews here -  (2)The LowdownAdidas is a company that likes to be at the forefront of new technology. Self-generating power is an exciting concept. You can now work out at...Adidas C-21 Self-Generating Electronic Exercise Bike Review