Spacers sit between your bearings and ensure that your bearings are right in the core of your wheel as soon as the axle of your frame is tightened. There are regularly small deviations in the core, frame and bearing, as a result of which the wheels do not run optimally.
As a competition rider you should always make sure you have different width precision spacers in your suitcase. DoubleFF's precision spacers are perfect for that! With handy color and size indication!
The width of your spacers can make all the difference between making your rollerblades run smoother.