Sometimes one hears and discusses the rolls, the hardness and roll diameter as well as their width. What's in it? Here are a few words about it.As a rule, roles have 2 numbers that say the following:
1. About Shore Scale and Durometer
The hardness of the wheel, measured using a shore scale and durometer.
Either the "D" or "A" scale- "D" scales are for hardening of plastic composite wheels
- "A" scales are for hardness of urethane compound wheels
(see image Durometer Conversion Chart)
The lower the number, the softer the wheels, providing more grip but less rolling.
The higher the number, the harder the wheels that offer less grip but roll easier.
2. About roll diameter
The roll diameter, given in millimeters.
For example:
- 55mm and 57mm are mainly used for freestyle and jam skating(the 55mm is based on a lowering of the center of gravity)
- 63mm is more used for derby and general skating
- 61mm and 62mm are widely used in hockey and speed _22200000-0000-0000-0000-0000000000222_​
Good to know and makes you smile
The measuring device, the durometer, has a maximum scale of 100, which means that it shows a maximum hardness of 100. 100 means the material is tough and will not yield.The smaller the number, the more the material yields (is softer)
How can it be that there are wheels that have a hardness rating of over 100?
With 105A, the rollers would then theoretically have to have bumps on the outside
Well, does that mean the hardness ratings between Europe and the US aren't exactly the same?! Thus, an indication of USA roles with 105A would rather be seen as +/- 95A.
Here is a conversion table for the different degrees of hardness
Finally.....a small note that I am not liable for wrong values, value declarations and/or purchase of wrong rolls. ;-)
PS:In addition, the weight of the person and the driving surface must be taken into account, which can play a major role :-)