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Frames

 

What I should know about the Mad4One and URC frames

 

In this category there are various types of frames, from the most basic to the most professional ones. But let's start with the material:
 

Steel (URC, acronym for UnaRuota.com)

heavier but it can be easily bent and modified (if needed you can bring it back in its original shape). The Mad4One steel frames are made with Cr-Mo 4130 chromium-molybdenum steel, an alloy of steel that guarantees greater load resistance, lower specific weight and better tensile strength compared to unalloyed steel.
 

Aluminum (Mad4One)

The ROUND-shaped Mad4One frames are made of aluminum alloy AL7005-T6, that compared to the more common AL6061-T6  has a greater load resistance (+ 12%) and a higher fatigue resistance (+56%). Furthermore, we paid great attention to the diameter-thickness ratio of the tubes. Similar to the SQUARE-shaped frame, the vertical tube of our round-shaped frames is of variable thickness. In the interlocking area a tube diameter of 40mm and a tube wall thickness of 3.6mm gives greater rigidity and strength to the entire structure. Generally speaking the aluminum frames are lighter and more rigid than the steel ones, however, you will not be able to modify its shape (if accidentally you bend it, you will not be able to bring it to its original shape).

The aluminum frames can be painted or anodized. All our aluminum-frames are anodized. For more info about this choice click here: Anodising.

 

We have written a document in which we describe our frames and how they have been designed. The shape, the material and the reasons of our choices. We hope you will find it interesting and useful: The Mad4One and URC Frames.

 

What we should pay attention to

It is important to check the width of the frame (you measure it at the base of the frame) to be sure that the hub fits to the wheel. Check also the width at the top of the frame neck, near the seat post.

For Trial it’s better to have a round crown frame without edges. Your shins will be safe! This is valid also for mountain unicycle. The absence of edges makes your unicycle more comfortable and safe.

In Freestyle and other specialties we often perform tricks in stand-up. In this case the crown where you put for feet is very important. A flat crown compared to a round one offers a much better feeling and facilitates balance. The wider the crown, the more comfortable and user-friendly the frame is. Also the presence of the anti-slip surface that ensure high security in the grip is a very important feature. For this reason our frames have two “false holes” made of solid.

Another characteristic to consider is the clearance, i.e. the distance between wheel and frame that tells us which tire can be mounted on our unicycle.

 

Pay attention to the weight. Is a lighter frame better than a heavy one?

Yes, if the frame does not lose in stiffness and stability. Frames that are too light do not last over time and also the performance is not at the top because a flexible frame absorbs energy. The final consideration is that there is also a limit to the lightness beyond which lightness becomes a defect.

 

As regards mountain unicycle: in this specialty almost all riders are using a disc brake system. In this case the frame should be equipped with the disc brake mounting tab. Please note that there are two mounting systems, one on the right and one on the left of the wheel, not all unicycles come with the disc brake mounting tab on both sides welded to the frame.

 

Braking system and tire

The disc brake appears on the market around 2012 and, in recent years, it has radically modified  the way to control the unicycle in DH. 4 years have passed, and we can now say that the brake pad is over.
The traditional frames, that have been designed with brake pad attack are dedicated to a specific wheel size. In fact, in this case there is a frame exclusively for  the 24-inch wheel, the frame for the 26-inch wheel and so on.
We think that it is the right time, to think of frames NOT designed for the brake pad.

URC has developed its own frame for MUNI (...and not only...) in 3 sizes, not linked to a specific wheel size.

 

The URC Muni frames of steel alloy CrMo-4130

The URC frames are available in the following sizes: XS - S - M - L.

On the frame XS you can mount tires up to:

  • 20-inch wheel with tire 20 x 4.00 

On the frame S you can mount tires up to:

  • 24-inch wheel with tire 24 x 4.00
  • 26-inch wheel with tire 26 x 2.40

On the  frame M you can mount tires up to:

  • 26-inch wheel with tire 26 x 4.00 
  • 27.5-inch wheel with tire 27.5 x 3.50 
  • 28-inch wheel with tire 29 x 2.50 

On the frame L you can mount tires up to:

  • 27.5-inch wheel with tire 27.5 x 3.50 
  • 28-inch wheel with tire 29 x 3.00 

 

IMPORTANT: compared to the previous version (black-red-sea green, which mount traditional tires) the new batches starting from May 2017 have been designed with a 5mm wider clearance (2,5mm each site). This new design is ideal for FAT tire x 4.00. This new frame with  a wider clearance, is available in the colors mustard-silver-pink.

 

The URC frames are designed for standard hubs with 100 mm pitch (distance between the bearings).
The height of the frame, together with the length of the cranks, build the measure to consider when you define the size of our mountain unicycle based on the min. inseam length (Inseam is the length of the inner leg).

Below the frame height:

  • URC-Extra-Small = 45 cm
  • URC-Small = 49,5 cm
  • URC-Medium  = 53,5 cm
  • URC-Large = 55 cm

Thickness of the saddle: approx. 6,5 cm

  • URC-Extra-Small: with the 125-cranks we will have a min. inseam length of  (45 + 6,5 + 12,5) = 64 cm
  • URC-Small: with the 140-cranks we will have a min. inseam length of  (49,5 + 6,5 + 14) = 70 cm
  • URC-Medium : with the 140-cranks we will have a min.inseam length of (53,5 + 6,5 + 14) = 74 cm
  • URC-Large : with the 140-cranks we will have a min.inseam length of (55 + 6,5 + 14) = 75,5 cm

 

NOTE: if we shorten our cranks we reduce the min. inseam length, if we mount longer cranks, the inseam length will increase.

On the other hand, if we speak of the tire, the choice here is really wide. The URC frame has therefore a second PLUS, I can buy a frame and different wheels, each one for a specific need / terrain / riding.

Always in the Mountain Unicycle framework we have also a valid option for the youngest or smallest riders, this is the MINI-MUNI with disc brake mounting taps. The perfect choice to learn since the beginning how to control your unicycle with the brake. The MINI-MUNI mounts the XS URC frame.

 

The MAD4ONE Muni frames in aluminum alloy AL-7005-T6

 

MAD4ONE has developed its own MUNI frame in 3 different sizes, not linked to a specific wheel size: S - M - L.

On the  MAD4ONE  S  you can mount:

  • 24-inch wheel with a traditional tire up to 24 x 3.00
  • 26-inch wheel with a traditional tire up to  26 x 2.70

The inside width is 91 mm.

On the  MAD4ONE  M  you can mount:

  • 24-inch wheel with a 24 x 4.00 fat tire
  • 26-inch wheel with a traditional tire up to 26 x 3.00
  • 27.5-inch with a traditional wheel up to 27.5 x 3.25
  • 28-inch with a traditional tire up to 29 x 2.50
  • 36-inch with a 36x2.25

The inside width is 91 mm.

The MAD4ONE  L has been designed specifically for the FAT tires lovers. On this frame you can mount:

  • 26" with a 26 x 4.00 fat tire
  • 27.5" with a 27.5 x 3.80 fat tire
  • 28" with a 29 x 3.25 fat tire
  • 32" with a 32x2.25 tire

Once we have mounted our FAT tire the clearance keeps wide and this provides excellent control of your muni even on muddy terrain.

 

The height of the frame, together with the length of the cranks, is the dimension to consider when you decide the size of our unicycle based on your min. inseam length.

Below the frame height:

  • MAD4ONE - S  = 49,5 cm
  • MAD4ONE - M  = 53 cm
  • MAD4ONE - L  = 55 cm

Thickness of the saddle: approx. 6,5 cm

  • MAD4ONE - S  : with the 140-cranks we will have a min. inseam length of  (49,5 + 6,5 + 14) = 70 cm
  • MAD4ONE - M  : with the 140-cranks we will have a min. inseam length of  (53 + 6,5 + 14) = 73,50 cm
  • MAD4ONE - L  : with the 140-cranks we will have a min. inseam length of (55 + 6,5 + 14) = 75,5 cm

NOTE: if we shorten our cranks we reduce the minimum inseam length however, if we mount longer cranks, the inseam length will increase.

The MAD4ONE Muni frames have been designed for hubs with 42mm bearings, with 100 mm pitch (distance between the bearings).

 
 
 

The new Mad4One 36" aluminum frame will be available starting from April, 6th 2021

Made of aluminum AL7005-T6 like all Mad4One aluminum frames, the new 36" is delivered with brake lever mount tab on both sides. This frame mounts rotors from 160 mm to 203 mm, that can be placed inside on the left or outside on the right.One of the area of the unicycle frame which is particularly stressed (in addition to the interlocking legs-vertical tube), is the spot where the disc brake is fastened to the frame. ....
click HERE to read more.

 
 
 
 

The sizes M and L of the Mad4One Muni frames are available also

in the LONG-NECK version

 

Here the vertical tube is 10cm longer than the standard ones. With the LONG-NECK frame the min. leg lengths are extended by 10 cm.

The LONG-NECK is available in the following colors: blue, flash green, titanium, bronze. On request we can anodize it in one of the 14 made in Italy colors:

 Choose the color you wish and tell it in your order. 

The LONG-NECK is important for taller riders. It offers greater stiffness and a more stable placement of your saddle. Combined with our MAD XXL seat-post this frame ensures the right position of your legs even if you are more than 2 mt tall.

  • MAD4ONE- LONG-NECK - M  : with the 140-cranks we will have a min. inseam length of (63 + 6,5 + 14 + 28,5) (9cm of our MAD XXL seatpost) = 112 cm
  • MAD4ONE- LONG-NECK - L  : with the 140-cranks we will have a min. inseam length of (65 + 6,5 + 14 + 28,5) (9cm of our MAD XXL seatpost) = 115 cm

A leg-length of 115cm corresponds to a height of approx. 2,30 mt.

 

Have you in mind to upgrade your unicycle with a Mad4One frame?

Click HERE to know more.

 

 

We have noticed that some Producers insert in their frames a very long seatpost in order to increase the robustness and stiffness of the frame. This is not necessary with our frames. It is sufficient to have a length of 10-15 cm to ensure the best stiffness. The ecess tube is just unnecessary weight.

 

 


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