All Konixx wheels are given one of two types of stiffness designations. The first is the standard “A” rating designation. The second is our exclusive “+” rating system which is required due to the complexity of our wheels made for tiled surfaces . Please refer to the information below to help in your decision about picking the Konixx wheel best suited for your given skating style/surface.
For wheels with the standard “a” rating we suggest to following for all weights and skaters:
Outdoor Wheels:

84a
(Rocket 2x)
Uses: Abrasive concrete or asphalt
Beginner to advanced skaters
Weight up to 105kg**
Indoor Wheels:

78a
(Spitfire)
Uses: Smooth Concrete, Coated/Painted Concrete, or Wood
Beginner to advanced skaters
Weight up to 105kg**
For Single Pour wheels with the Konixx “+” rating we suggest the following based on body weight, skating style, and surface skated on:

+0 Single Pour
(Catalyst, Pulsar)
Use: Tile Surfaces
Beginner to advanced skaters
Weight up to 90kg.
For Dual Pour* wheels with the Konixx “+” rating we suggest the following based on body weight, skating style, and surface skated on:

+0 Dual Pour
(Pure-X, Tachyon)
Use: Tile Surfaces
Beginner Skater up to 81kg
Intermediate to advanced Skater up to 77kg

+1 Dual Pour
(Pure-X)
Use: Tile Surfaces
Beginner Skater 81kg to 88kg
Intermediate Skater 79kg to 86kg
Advanced Skater 77kg to 83kg

+2 Dual Pour
(Pure-X)
Use: Tile Surfaces
Beginner Skater 88kg to 105kg**
Intermediate Skater 86kg to 105kg**
Advanced Skater 77kg to 105kg**
* The unique properties of a Dual Pour wheel require more specific stiffness limitations. As a result, in the Pure we offer three + ratings catering to higher body weights and more aggressive skating styles. The above guidelines for body weights are just that, guidelines. If you find yourself between two stiffness ratings I body weight, we suggest the softer of the two options for beginner to intermediate skaters and the stiffer of the two for advanced skaters.
**If you are over 105kg we guarantee the Pure wheel against breakage. If you are, we recommend one of our single pour wheels such as the Catalyst.