The FRAME of my unicycle for Freestyle: which is the right size for me?

Height of the frame + thickness of the saddle + length of the cranks = minimum leg length

If a rider grows and their leg length changes, they must raise the seat post as necessary (generally a few centimeters) to continue using the unicycle at an optimal height.

The size of the wheel does not generally affect the "minimum leg length," but determines the difficulty of riding and the reactivity of the unicycle, as well as the level of power needed to ride it. A 24" wheel has a shorter total gear ratio and is therefore easier and requires less power than a 27.5" or a 29" wheel.

Frame-Leg-Length.jpg

Remember that the "minimum leg length" given in our site is the distance between the pedal (in its lowest position) and the saddle.

Next to this data you will find the crank used to obtain this measurement. With shorter cranks, the minimum leg length is also shortened and vice versa.

The leg length must be greater than the B value (you will find this photo on our site, at the end of the technical features of each unicycle).

It is important to know the B value (normally expressed in mm) in order to define the right length of your frame (value A).

IMPORTANT: the B value, that may be called "the height of your unicycle" depends also on your style and habit, however, as a rule, the leg length is  1-2 cm greater than the B value.

If the B value is greater than your leg length, it will be almost impossible for you to ride the unicycle. If, on the other hand, the B value is much lower, you will be able to ride the unicycle, however with a "more sitting" position. It will be therefore more difficult and tiring.

Now let's do a practical example: you have measured your leg length applying  the method described above.

Let's imagine that your leg length is 81cm (= 810mm) and that you are interested in the IRON-MAD EXPERT Freestyle.

Iron-Mad Basic - EXPERT
Saddle Slim, thickness 47mm
From the middle of the hub to the crown - 283mm
Thickness of the saddle - 47mm
Minimun leg length
Frame (neck) 310 380 450 520
Cranks - 80mm 720 790 860 930
Cranks - 90mm 730 800 870 940
Cranks - 100mm 740 810 880 950

Before we determine the frame length you need to answer this question:

what kind of cranks would you like to mount? Let's imagine you want to use 90mm cranks.

In this case you can use either the 310mm or the 380mm frame. On the other hand, the 450 and 520mm frames are certainly impossible for you to use.

Here the table "minimum leg length" that you find at the end of the description of each unicycle:

Iron-Mad Basic
Saddle COMFORT, thickness 62mm
From the middle of the hub to the crown - 283mm
Thickness of the saddle - 62mm
Minimun leg length
Frame (neck) 310 380 450 520
Cranks - 89mm 745 815 885 955
Cranks - 100mm 755 825 895 965
Iron-Mad Basic
Saddle Slim, thickness 47mm
From the middle of the hub to the crown - 283mm
Thickness of the saddle - 47mm
Minimun leg length
Frame (neck) 310 380 450 520
Cranks - 90mm 730 800 870 940
Cranks - 100mm 740 810 880 950

Iron-Mad - ELITE
Saddle SLIM, thickness 47mm
From the middle of the hub to the crown - 283mm
Thickness of the saddle - 47mm
Minimun leg length
Frame (neck) 310 380 450 520
Cranks - 89mm 730 800 870 940

Iron-Mad Basic - EXPERT
Saddle Slim, thickness 47mm
From the middle of the hub to the crown - 283mm
Thickness of the saddle - 47mm
Minimun leg length
Frame (neck) 310 380 450 520
Cranks - 80mm 720 790 860 930
Cranks - 90mm 730 800 870 940
Cranks - 100mm 740 810 880 950

Mad4One Freestyle - 100 - cotterless hub
Saddle SLIM, thickness 47mm
From the middle of the hub to the crown - 286mm
Thickness of the saddle - 47mm
Minimun leg length
Frame (neck) 310 380 450 500
Cranks - 89mm 732 802 872 922
Cranks - 100mm 743 813 883 933
Cranks - 114mm 757 827 897 947

Mad4One Freestyle - 90 - hub ISIS
Saddle Slim, thickness 47mm
From the middle of the hub to the crown - 276mm
Thickness of the saddle - 47mm
Minimun leg length
Frame (neck) 310 380 450 500
Cranks - 80mm 713 783 853 903
Cranks - 90mm 723 793 863 913
Cranks - 100mm 733 803 873 923

Mad4One Freestyle - 100 - hub ISIS
Saddle Slim, thickness 47mm
From the middle of the hub to the crown - 286mm
Thickness of the saddle - 47mm
Minimun leg length
Frame (neck) 310 380 450 500
Cranks - 80mm 723 793 863 913
Cranks - 90mm 733 803 873 923
Cranks - 100mm 743 813 883 933

PowerSquare Flat
Saddle Slim, thickness 47mm
From the middle of the hub to the crown - 290mm
Thickness of the saddle - 47mm
Minimun leg length
Frame (neck) 210 270 330
Cranks - 100mm 647 707 767
Cranks - 103mm 650 710 770
Cranks - 110mm 657 717 777
Cranks - 125mm 672 732 792
Cranks - 135mm 682 742 802