24" URC Mountain Unicycle Fat - ISIS *Required step

Round frame made from chromium molybdenum steel alloy CrMo-4130, traditional saddle or Handle Saddle, ISIS hub and cranks. You can choose the standard configuration we propose, or basically change everything from color to components. Click the product to view the product technical details and useful information and tips.








The URC mountain unicycles by Mad4One are the perfect choice both for relaxed rides out in nature, and emptying the tank with big, all-out efforts in Downhill, Uphill or Cross-Country. They are equally suited for beginners and experienced mountain unicyclists alike.
Low-intensity spin or high-intensity all-action ride - you decide.



The URC frames are made from CrMo-4130 chromium-molybdenum steel. Based on the factors highlighted below this alloyed steel is the best on the market today. CrMo-4130 guarantees greater load resistance, lower specific weight and better tensile strength compared to the simplest steels alloyed with carbon. Thanks to these properties we could use thinner tube sets, that significantly reduces the weight without affecting its excellent stiffness and stability. This make the URCs also competitive compared to mid-range aluminum unicycles.


From the beginning the URC mountain unicycles mount rims 46 mm wide. Many low-to-mid-range unicycles have narrower rims. We believe that riding a rim of the right width (neither too narrow nor too wide) has important advantages, such as better traction, ride quality and stability. With a 46 mm wide rim your tire has a wider base to the increased rim width, which results to a more consistent contact with the riding surface. Last but not least, with a 46 mm rim you have a unicycle that offers you the same riding experience of the most famous mountain unicycles!


Here we offer the same flexibility you know from Mad4One. Every URC mountain unicycle can be customized, ensuring that it fits for you and for your purpose. You can start with an entry level configuration, suitable for the first rides on the trails,  and then upgrade it up to a top-of-the-range setup, with all the ingredients of a real Mad4One mountain unicycle, but with a steel frame. Our goal is to give you all instruments to configure it according to your needs without overstepping your budget. Last but not least, you can customize your URC mountain unicycle also in the color. All the aluminum parts can be anodized in the 14 made in Italy colors we offer.

The URC unicycles are designed with a larger audience in mind. We have tried to balance the quality and price, to be able to provide economical unicycles and parts that are among the best in their category. URC unicycles offer the same customizability you know from Mad4One. Our wide selection is unchanged: the chromium molybdenum steel alloy CrMo-4130 frame, the wide range of cranks, from the standard version to the high-end MAD-Tecno and Agile, the rich choice of Shimano disc brakes, our URC part selection is unmatched. Our aim is to enable you to “build” your unicycle as you really wish and upgrade it over time as per your needs without overstepping your budget.

1 Traditional saddle or Handle Saddle

An innovative option is for sure the Handle Saddle. Born in 2017 the Handle Saddle is the new generation saddle developed by Mad4One. Excellent in solidity, lightness and stiffness, the Handle Saddle ensures full control of your unicycle, thanks to the formidable handling and great reliability it offers on challenging trails and steep downhills. Combined with the Mad-Extension it offers the possibility to customize the position of your hands.

4 From the standard ISIS UnicycleStuff up to the high-end MAD-Tecno and AGILE

Also as regards cranks the choice is really wide. We go from the standard ISIS UnicycleStuff, 1 hole, up to the high-end MAD-Tecno or AGILE. Both Tecno and AGILE are 100% compatible with any ISIS-hub, they come out of the same aluminum mold and are made from ERGAL AL7075-T6, the aluminum alloy that offers the highest strength and stiffness. But where does the difference lie? In the finishing phase the Tecno are then beveled while the AGILE are further milled with different CNC machining that optimize the weight without compromising the strength (they are 30% lighter than the Tecno). Furthermore we tried to reduce as much as possible the Q-Factor and we succeeded. In fact, the AGILE are narrower than the ISIS-standards. Their Q-Factor has been reduced by 3mm per side, i.e. a total of 6mm. A narrow Q-Factor improves riding efficiency (better power generation and more aerodynamic), which is very important at high speeds, such as speed on the track.

2 Unbreakable Seatpost

An option we recommend is the 40mm one piece 3D forged Mad4One XXL seatpost, which 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.

5 Handbuilt wheel

The wheels mounted on our unicycles are all handbuilt by us in our laboratory and arranged in a 4X spoke pattern. This means that every spoke intersects four others between the hub and the rim. Crossing the spokes over helps them handle the pedalling braking torque being transmitted from the hub to the rim. The 4X lacing pattern requires a more accurate and expensive assembly process, that, combined with the high quality components used, ensures a much better durability and resistance of the wheel.

3 The frame, super strong, stable and reliable, born from the experience made with Mad4One

The choice of the “right” material is a very important element of the entire frame design. The URC frames are made from CrMo-4130 chromium-molybdenum steel, an alloy that guarantees greater load resistance, lower specific weight and better tensile strength compared to unalloyed steel. In the design of this frame we paid also great attention to the shape and the diameter-thickness ratio of the tubes.

6 A wide range of Shimano disc brake systems

There's a massive variety of performance across the spectrum we offer, from the first option we propose, good in what it does and comparable in quality to the disc brake systems you usually find on the best known mountain unicycles available on the market, to the more powerful ones, up to the 4-piston braking systems, which offers excellent modularity and superior stopping power in all conditions, instilling great downhill confidence and control.

We are often identified for the rich variety of colors and possible combinations we offer, but our main identity is that of design engineers who pay great attention to functionality and stability. Why the colors? Because the unicycle is also fun and passion, if it’s monotonous and without personality what pleasure is it?







FRAME SIZE XS: 20" x 4.00

FRAME SIZE S: 26" x 2.50

FRAME SIZE M: 27.5" x 2.50

FRAME SIZE L: 29" x3.25



Welded - painted
Chromium molybdenum steel CrMo-4130


Forged and CNC Machined - Anodized
Aluminium AL-6061-T6

ISIS - CNC Machined and Forged - Anodized
Aluminum AL-7075-T6 (ERGAL)


Machined from one piece - Hardened - Painted
Chromium molybdenum steel CrMo-4130


URC 25.4 mm
steel - painted


CNC machined - Anodized
Aluminum AL-6061-T6


MAD4ONE Pinned
Aluminum AL-6061-T6


14G – Silver or Black


Brass Nickel Plated - Silver


Welded - Anodized
Aluminum AL-6061-T6

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.

The wheel: which size for your frame?

After having defined the right frame size for you, be it a URC or a Mad4One mountain unicycle, you need to know which wheel sizes can be mounted on that frame. The aluminum frame is available in 3 sizes and the URC in 4 different sizes.

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 seat tube 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.

What are the differences between the various sizes of the mountain unicycles?

Our smallest mountain unicycle wheel is a 20” called Mini-Muni. The Mini-Muni is the perfect mountain unicycle for young riders, small but powerful, with all the features of our bigger wheels. Following the Mini-Muni, there are two intermediate sizes, the 24" and the 26". Lightweight and easy to control, they are the perfect size for young boys and girls who are still growing. Finally, we have the classic 27.5", the best choice for Downhill (DH) lovers, and the 29”, perfect for Cross-Country (XC).

The brake on the unicycle is used differently from how it is used on the bicycle

The main purpose of the bicycle brake is to reduce the speed of the bicycle or to prevent it from moving. On the unicycle, the brake is used to regulate speed and to keep control when riding downhill even at high speed. It is therefore easy to get used to "keep on pulling the brake lever" even just with light pressure, on long down-hills. This light and prolonged use of the brake is a mistake that can cost you.

Let's extend our Handle Saddle ... here is the MAD-Extension

A saddle that can be adjusted both in inclination and extension allows weight to be distributed, improving comfort, especially over long distances. There are various solutions on the market. The Mad-Extension is the right one if you already have or wish to have the Mad4One Handle Saddle. There are 2 mounting systems available: the standard Mad4One and the URSLI.

Are you looking for a mountain unicycle stronger than the Mad4One? Here’s the MONTAGNA

Yes, the MONTAGNA is in fact a Mad4One in all its components, but a frame made from alloyed steel Cr-Mo-4130. MONTAGNA is a setup that we propose only for the URC line in the wheel size 26”, 27.5” and 29”.This unicycle already includes the best options as regards hub (Mad4One Disc ISIS), cranks (ISIS MAD-Tecno 2 or 3 holes), rim (reinforced) and tire, but it mounts the URC frame made from Cr-Mo 4130 chromium-molybdenum steel, one of the best steel alloy available today, which offers higher load resistance, lower specific weight and better tensile strength than common steels often called "High Tensile".

The Handle Saddle, the most light and durable unicycle saddle

The Handle Saddle is a new concept of saddle that Mad4One has brought on the market, with a weight nearly half of the one of a traditional saddle, however stiff and strong as a traditional saddle with a carbon base, compared to which it is still lighter. In the development of the Handle Saddle priority has been given to the "easy catch", the "easy handling" and the "freedom of movement". This is the Handle Saddle of Mad4one available in different sizes and finishes.

How we developed the Mad4One's aluminum and steel frames

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. Weight: it’s important, but if it's light and weak it's useless. The material: the Mad4One frames are built with more performing aluminum alloys than the common AL6061-T6. The URC frames are made from CrMo-4130 chromium-molybdenum steel, one of the best alloyed steel available on the market today. CrMo-4130 guarantees greater load resistance, lower specific weight and better tensile strength compared to the simplest steels alloyed with carbon. Compatibility of the components: it means freedom for you to upgrade and improve.

The Mad4One World Championship medal board

Mad4One is the TOP of the range for mountain unicycling. This is confirmed by the great results achieved by many Top Muni Riders around the world, who have won many World Champions on their Mad4One Munis. The "Mad4one medal table", which we are particularly proud of, is the list of the best results achieved by riders who have attended the last World Champions riding a Mad4One muni.

Disk brake with 2- or 4-pistons brake caliper?

The Shimano brake systems Deore M4100 and M6100 are now available in four-piston versions, too. It features the same tech as the two-piston version and looks nearly identical to the rest of Shimano's four-piston brakes, but it’s not the same. Mo´power mo' modulation are the main advantages you get from this new version.

2019 - Our Interviews with the Greatest Unicyclists of Ever

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 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. Speaking of Mountain unicycling here is the interview with Florian Rabensteiner, one of the most decorated Muni riders on the planet, and the interview with Ben Soja, the only unicyclist who has succeeded in Everesting to date.

Florian Rabensteiner is an Italian Expert-Muni-Rider and one of the Top-Riders of the Mad4One Team. Since many years is Florian at the top of all national and international ranks in Downhill, Cross-Country, Uphill and Cyclocross and is one of the most decorated muni-riders on the planet. But, before meeting him, letßs take a look at his results: since 2014 he is unbeaten World Champion in Downhill, gold medal at Unicon XVII Montreal, World Champion in 2016 at Unicon XVIII Donostia, and again gold medal in 2018 at Unicon XIX Ansan. Also in Uphill is Florian always on the podium.

In 2011 Ben had a serious wrist injury and had to give up many hobbies. But, as he says: "...Injuries can often create new perspectives and possibilities! I started riding muni. It turned out that unicycling was so much fun that I stuck with it. With all the great unicycle-related experiences I’ve had over the last few years, I would not change anything!". Ten years later, he is still riding muni at a very high level. Ben speaks about his experience as muni-rider in the United States, and tell us how a passion can fill your soul.