Gyro XG

The Gyro XG slalom wheel is a re-release of the much-loved Gyro Crazyball wheel.

The XG is the abbreviation of X Gravity, a somewhat cryptic reference to the urban wheel radius, which gives additional grip. (Contrary to the Crazyball wheel, which has a bullet radius, the XG wheel has an urban radius.)
The XG wheel also has a remarkable small hub of 27 mm.
These adaptations mean that the Gyro XG should be classified a slide slalom wheel (instead of a speed slalom wheel as the Gyro Crazyball).
If you wonder what slide slalom is, look at this Youtube contest.

It is the ideal wheel too for cruising and doing some slidings from time to time.

The yellow XG wheels have a 85A durometer; the white XG wheels a 87A durometer.