The K2 Flashdisk 125mm Wheel is a great choice for speed skating. The K2 wheels offer great grip and decent all-round performance. 

The best wheel has K2 ever produced!?

The Flash Discs are made up of dual urethanes, one with an ultra-high rebound for the inner core and another extra durable version for the outer pour. They also feature an aerodynamic disc hub that provides support and speed, while reducing drag. The Flash Disc wheels are sold individually and come in their own multi-purpose storage bags.

See them, feel them, hear them!