20" Unicycle for Freestyle ISIS - Iron-Mad Expert *Required step

Square-shaped frame made from CrMo-4130 chromium molybdenum steel alloy, seat post 25.4mm, hub MAD-Tecno ISIS made from steel alloy Cr-Mo-4130, 20-inch wheel, bearing spacing 100mm, cranks ISIS madtecno made from aluminum alloy AL7075-T6. Thanks to the materials and the solutions chosen, the Iron-Mad freestyles are the best of their category in terms of stiffness and durability. The Iron-Mad Elite is suitable for training and competition. You can choose the standard configuration we propose or change everything from the components like rim, cranks, pedals, seat clamp and tire to the color. Just build it as you like.








Whether for hard training to prepare yourself for your next race, or simply to start on the right foot in freestyle, the Iron-Mad unicycles ensure the highest level of robustness and durability. Made from a superior steel alloy, the Iron-Mad freestyle unicycle is available in 3 setups: Basic, Elite and Expert, to meet the needs as regards quality, stability an price, of all skill-levels, from the beginner to the most advanced one. With the Iron-Mad we offer the same flexibility and refinement of all details you know from Mad4One. Having the appropriate tool is the first step for aspiring athletes to achieve their goals.

Here are the steel alloy unicycles of Mad4One, Iron-Mad BASIC, Iron-Mad ELITE and Iron-Mad EXPERT,

the TOP ones in the category of steel unicycles for freestyle.



The Mad4One’s square-shaped Iron-Mad frames are made from CrMo-4130 chromium-molybdenum steel, an alloy of steel that guarantees greater load resistance, lower specific weight and better tensile strength compared to unalloyed steel. Super stiff and strong, the Iron-Mad Freestyle is the right choice to have a long-lasting unicycle. In the development of this freestyle we paid great attention not only in the materials, but also in the shape, implementing all details we already applied in the Mad4One aluminum Freestyle. The most critical point in the unicycle frame is the junction between the vertical tube and the crown. The frame of our Iron-Mad has a "one-piece" reinenforced vertical tube that gives extra rigidity and strength to the entire structure. On all our frames, both in steel and aluminum, it is not necessary to mount a very long seatpost to increase stiffness and stability, it is enough to insert the seatpost only 10-15 cm to ensure the best robustness. All the excess seatpost part is useless and it is just extra weight you carry with you.


Yes, even in the Iron-Mad family you can customize your unicycle according to your skill-level, your desire and, last but not least, your budget. The wheel, built by hand in our warehouse, is available with a single-wall rim, which makes it cheaper, but also with the MAD-Round 32 rim, very robust and stable, that makes this wheel equal to the one mounted on the MAD-Freestyle. Also for the seatpost  you have a double option: standard steel seatpost or the MAD XXL in aluminum. The same as regards the seat clamp: you can opt for the double quick release or the two-screw clamp. Also the range of pedals we propose is wide and interesting. Saddle and tire are the ones mounted on the MAD-Freestyle. Two words about the tire: the white Mad4One tire is of high quality and highly appreciated by many expert-freestylers and world champions. Even in the color you can make your choice: the frame is available in grey and silver, while all the aluminum components can be anodized in the 14 made in Italy colors.


The Iron-Mad freestyle frame has a wide and comfortable flat crown. Thanks to this characteristic tricks like standup and coasting become much easier, and you can perfectly control your freestyle. The two false holes on the crown offer a rock-solid grip when the foot, which supports our weight, presses on the frame and the round edges of the frame make your foot gesture really smooth and fluid. The Iron-Mad frame is available in different standard lengths (310, 380, 450, 520 mm), but we can easily cut it to size if you need. Simply put a note in your order and we will cut the frame tube for free according to your instructions.

The Iron-Mad Freestyle is the Top of the range in the category of freestyle with steel frame. Here you find 3 different Setups we propose: the BASIC, the ELITE and the EXPERT, the latter also ideal for the more advanced tricks in X-Style (for this specialty please mount the MADapters). However you can configure the Iron-Mad on your own, according to your style and needs. The frame made from a steel alloy of superior quality, the shape refined in all details such as the wide flat crown, the double butted reinforced vertical tube and the well rounded edges in addition to the wide choice of cranks and pedals and the wheel built by hand in our warehouse, all these features help to increase you level of mastery and precision in riding. The Iron-Mad is also an excellent training tool also for the most advanced freestylers, who, despite having the aluminum unicycle for competition, use the Iron-Mad to increase their strength and level of performance.

1 The Mad4One SLIM saddle

In freestyle the saddle plays an important role. In many tricks we need to hold it in our hand and it helps us to execute our trick. We’ve designed our freestyle saddles to offer and easy hand grip, even with small hands, and we’ve decided to have the handle without hole to guarantee greater finger safety. The Mad4One SLIM saddle is available in black and white.

3 Double Quick Release or the Mad4One 2-Bolts Clamp

The quick release clamp (with a single lever) is the most easy one to change the seat height quickly, especially when you are at the beginning,  but sometimes it’s not sufficient. That’s why we propose to mount a double quick release. The second option at your disposal is the Mad4One 2-bolts-clamp in aluminum, that ensure better tightness and is anodized in the 14 made in Italy colors.

5 In Freestyle it's important to have a light wheel

In freestyle a light, but strong and reliable wheel makes the difference. Lightweight wheels accelerate faster than heavy ones and this helps when you’re off from a stop. Lighter wheels also decelerate faster. Tire an rim determine the weight of the wheel of the unicycle. The Mad4One 20” Freestyle tire is very light, rigid and can be inflated at really high pressure. As Kristina Ratzka says: “ … I've the feeling that with this tire I can both jump well and make a good Gliding. However, the biggest benefit I've got with this tire is that it's the fastest tire I've tried so far!..”. The rim is the second element that determines the lightness of the wheel. The MAD-Round-32, that we propose is a rim of high quality, super strong and light.

2 Standard Seatpost or the Unbreakable MAD-XXL

The 40 cm one piece 3D forged Mad4One XXL is the longest and strongest seatpost of ever. The higher part of the tube is double butted to avoid any breakage. The saddle holder is inclined by two degrees and can be used in both directions.

4 The frame, super stiff and durable, born from the experience and success of the MAD-Freestyle

Better material always means longer life, as well as more stiffness and better performance. A unicycle can be designed in many ways, but only a few of them are the right ones. The square-shaped Iron-Made frames are made with CrMo-4130 chromium-molybdenum steel, an alloy of steel that guarantees greater load resistance, lower specific weight and better tensile strength compared to unalloyed steel. But that’s not all. The lifespan of your Iron-Mad has no rivals. Even if in the future you decide to move to a freestyle in aluminum, you can easily resell your Iron-mad. You won't have to worry if the future owner is a big strong guy, or a thin and light girl, your Iron-Mad won't have any problems. Your Iron-Mad is super strong!

6 All our wheels are hand built by us in our warehouse

The wheels mounted on our unicycles are all hand built by us and arranged in a 4X spoke pattern. The term “pattern” indicates the number of intersections that a spoke makes before reaching the rim. In a 4 cross-pattern wheel every spoke intersects four others between the hub and the rim. Crossing the spokes over helps them handle the pedaling braking torque being transmitted from the hub to the rim. The 4X lacing pattern requires an accurate and more expensive assembly process, that, combined with the high quality components used, ensures a much better durability and resistance of the wheel.

7 From the Cotterless Steel Cranks to the ISIS MAD-Tecno in ERGAL 7075-T6 for Profi-Riders

The more advanced you are in performing your riding-skills, the more likely you will look for a setup that ensures higher precision and performance. The 3 setups we propose for the Iron-Mad: Basic, Elite an Expert, are the concrete example of this natural evolution of the skills and needs of every freestyler. So let's start with standard square cranks for beginners up to the ISIS MAD-Tecno in aluminum alloy AL-7075-T6 (ERGAL), extremely robust with a comfortable and wide surface highly appreciated by the most advanced riders.

Usually in freestyle the unicycle is preferred in a neutral color. The colors most chosen for the frame are silver, slate gray or in some cases black. This makes the unicycle easy to combine with the colors of the costume and with the unicycles of our freestyle group. The frame of our Iron-Mad is available in 2 colors, silver and grey, and all the components in aluminum can be anodized in the 14 made in Italy colors. In fact some freestylers have decided to add a signature feature such as a light blue or red rim with the seatpost clamp of the same color, that recalls the colors of the club they belong to or simply because they want to make their unicycle more unique.







TIRE: 20" X 2.10



Welded - painted
Chromium molybdenum steel CrMo-4130


Forged - painted

Forged and CNC machined – anodized
Aluminum  AL-6061-T6

ISIS – Forged and CNC machined – anodized
Aluminum  AL-7075-T6 (ERGAL)


Chromium molybdenum steel CrMo-4130


URC 25.4 mm
Steel - painted


Aluminum AL-6061-T6

CNC machined - Anodized
Aluminum AL-6061-T6


Pinned - Anodized
Aluminum AL-6061-T6


14G – Black


Brass Nickel Plated - Silver

The frame: which size is the right one for me?

If we add the height of the frame to the thickness of the saddle and the length of the cranks, we have our "minimum leg length". Here we are talking about the B-value of our unicycle.

Some important measures to avoid mistakes

What is the right saddle height? How do I measure my leg length? How do I calculate how long my seatpost should be? These are some of the questions we ask ourselves when we start configuring our new unicycle.

First I read the instructions to assemble my unicycle

I have just received my new unicycle and first I carefully read the assembly instructions I found in the box. This information is useful not only for the assembly phase, but also for the correct use and maintenance of my unicycle over time.

MAD-Freestyle vs Iron-Mad: Aluminum vs Steel
Comparison and main differences

The current versions of the Iron-Mad and the Mad-Freestyle are the result of the experiences and successes gathered since 2013 that confirm the goodness of the improvements and optimizations that we've been able to implement.  Thanks to this research and development process, these two unicycles now rank first in terms of stability, quality and wheel components. But let's look at them in detail ...

The Iron-Mad and the 3 Setups we propose: Basic, Elite and Expert

The Iron-Mad Basic is the right choice for those who already know how to ride a unicycle and now have decided to approach this specialty: the Freestyle. For this reason they do not want to spend too much at the beginning. The Iron-Mad is a freestyle of quality and differs from the Elite Version in the hub-cranks system. It mounts cotterless cranks, that are cheaper having however their limits;  the Elite mounts ISIS hub and cranks. The Expert Setup differs from the Elite only in the type of cranks. Here we mount the ISIS MAD-Tecno, made from aluminum AL-7075-T6 (ERGAL).

It’s the first time I inflate the tire of my freestyle. How should I do it?

While the majority of you will almost certainly know how to inflate the tire on your bicycle, it’s another of those simple tasks, like changing an inner tube, that can seem pretty confusing to a beginner. The tire is shipped flat for safety reasons, especially if sent by plane. When you take the wheel out of the box it might look like you see in the enclosed photo. You must place the tire in the right position before you start inflating the wheel. Pay attention to the position of the valve, it must be perpendicular to the rim.

How to remove the tire and the inner tube of your Freestyle

There are few an simple steps to do this work in the right way.  Deflate tire completely. Even a small amount of air left in the tube can make it more difficult to get the tire off. For best results press downward on wheel while deflating the tire. Push one bead of tire toward rim center. The tire bead will be pressed tight against rim. Pushing it inwards loosens the bead from the rim. Do this all around the diameter of the rim.

How we developed the Mad4One aluminum and steel frames and the reasons of our choices

The unicycle is the result of the choices made by the designer. There are many ways to design a mechanical detail, but only a few of them are the right ones. That's why some choices make the difference. The weight: it’s important, but if it's light and weak it's useless. The material: the Mad4One frames are made from a more performing aluminum alloys than the common AL6061-T6, and for our steel frames we have decided to use the Cr-Mo 4130 chromium-molybdenum steel, an alloy that guarantees greater performances compared to unalloyed steel. Compatibility of the components: it means freedom for you to update and improve.

MAD-Freestyle 90 or 100? Here what Katrine Jensen and Ryan Olfers have chosen

Katrine Jensen, 2 times world champion in individual freestyle and X-Style (Unicon 2012 and 2014) and Ryan Olfers, 3 times world champion (Unicon 2014, 2016 and 2018) in individual freestyle, have been using for years with great success the MAD-Freestyle. They tell us the reason why one prefers the MAD-Freestyle 100 and the other the 90.

The German Champion Kristina Ratzka tells the reasons why she has swiched to the MAD-Freestyle

July 2020, the successful freestyle rider Kristina Ratzka had the great idea of opening a unicycle school on YouTube. Said and done, the Unicycle School was built in a very short time. Since then, numerous tutorials for beginners and advanced freestylers have been put online. In this video Kristina explains why she switched to the MAD-Freestyle and what she particularly likes about our unicycle. We are very happy about this feedback and are sure that this video can also help you to make the right choice.

The MAD-Freestyle: from the birth to the today's version

In 2013 we start with the development of our unicycle for Freestyle. Over the years we have built various constructive versions: the first was the glued one. It was excellent in the performance but the costs were too high to pass to series prodution. With the glued MAD-Freestyle Kaito Soji became in 2014 World Champion in Pair Expert  and Vice World Champion in Individual Expert at UNICON XVII. The screw assembled version followed. It was even more valid from a structural point of view, but required a high-precision machining of all components for optimal assembly. With this unicycle Ryan Olfers becomes World Champion in individual Freestyle in 2016 at UNICON XVIII.

The Mad4One Medal Board

Mad4One is the TOP of the range for freestyle. This is confirmed by the great results achieved by many Top Freestylers around the world, who have won many World Champions on their MAD-Freestyle. Also in 2018 at Unicon Ansan-Korea, the MAD-Freestyle climbed the highest podium with the winners of gold, silver and bronze in the individual male Expert. Here you find the Mad4one medal table of which we are particularly proud, with the best results achieved by riders who have attended the last World Champions riding a Mad4One unicycle.

In this section we speak of the TOP of the range for freestyle, the MAD-Freestyle in aluminum. An opportunity to get closer to some of the today's best riders in this discipline, to hear their advice and to know what they do to be the Best.

2019 – Our Interviews with the Greatest Freestyle Riders

In 2019 Mad4One interviewed the greatest unicycle racers of all time, each one multiple champion in his specialty. They differs one from the other and come also from different countries all over the world, but they all have one element in common: the passion for unicycling. Whether it's freestylers like Katrine Jensen, Kaito Shoji and Ryan Olfers, great sprinters like Niklas Wojtek, Leonie and Alina Czimek, experts in hockey like the Swiss national Hockey Team, talented urban riders like Pierre Sturny or downhillers like Ben Soja and the most decorated muni-rider Florian Rabensteiner:  they are all among the TOP of the unicycling world, but that's not all. They are also concrete models of passion, discipline and tenacity.

Great athletes perform extremely well in the “right – now moment” .., and every time Kaito went on stage was his “right – now moment” and he always performed exceptionally well. Since the beginning he has fully mastered two different specialties. What he has been able to accomplish in Freestyle has been monumental, but that's not all, he has been also one of the best unicyclists in the world in track speed. Kaito Shoji, the tentime Unicon Gold Medalist and World Champion, is the concrete example of what Pietro Mennea (the best sprinter Italy has ever had) once said: “Talent is not enough to become a World Champion, you need also a lot of passion, determination and ambition”.

Katrine Jensen had the talent to become a successful freestyler and she combined her talent with training, physical strength and endurance in order to compete at the highest levels. For two years in a row Katrine has been World Champion in individual freestyle and X-Style (2014 Unicon Montreal and 2016 Unicon San Sebastian). Someone said: “A champion in sports is a champion in life, too”. Is it right for you?. Katrine answers: ”In some way I think that it may be right. I do believe that we all have something that we are natural good at, and something that we find more challenging and difficult. I’m a competitive unicyclist and this has taught me a lot of things that I’ve had good use of in many other aspects of my life”.

In this very pleasant interview with Ryan Olfers, the 2-times World Champion and 1-time Vice-World Champion in individual freestyle Expert, we’ve understood what this sport means for him and why he loves it so much: the freedom to do, to create, to show others what he loves most and for which he has worked hard. All this being fully aware of the fact that ”…the most important thing is that I’m enjoying every single second I spend on the stage, because it’s an opportunity that you never should take for granted…”. It’s always exciting to hear an athlete saying: ”this sport means the world to me”. Two very simple words, that make us understand the greatness of Ryan’s passion for this sport.

Even in unicycling we often find fantastic coaches who train great athletes. Yes, this time we have decided to look at our sport from a different perspective, the one of the trainer. Aaron Widlak always provides his group with new stimulus and motivations to grow, to improve and to give always their best. And the results arrive: 2016, 2018 and 2019, his DJK Adler 07 freestyle group won the title of German Champion! In this interview Aaron tells us how he manages to keep the motivation of his freestylers always at the highest level, where his creativity comes from, and what he loves most about this sport.

“Freestyle is my passion because for me, freestyle combines everything that makes out of a sport a good sport. I can train, execute tricks, achieve my limits and go further, I can give space to my creativity and measure my skills with other freestylers…. What I love most is that you never stop learning. There is always something to try. I also find the combination of trick, music and presentation awesome! It's a pleasure to show to the audience what you can do and see the enthusiasm in their eyes”. Here’s how Kathi Boll, Vice-World Champion in Freestyle (Unicon 2014 and 2016) and Freestyle Champion at the German Championships 2009, 2010, 2011, 2014, 2015 and 2017 has replied to one of the various questions we’ve put her during this interesting interview.