Finally some decent bearings are available, which can fit to all trucks! These TRAMPA bearings are easily recognisable due to their red outer shell. The bearings have been polished to an ABEC 5 standard, which is higher quality than all other ATB brands and allows for higher top end speeds. These TRAMPA bearings will fit too all the other brands of hub and Axle. If the rider uses trucks with 10mm axles (10mm skate trucks) then the bearing reducer sleeves are needed for Trampa bearings to fit. These reduce the 12mm bearing to fit 10mm axles. The sleeves also allow the nut to tighten much better against the bearing as the sidewalls are better protected. This set of bearings includes the REDUCER SLEEVES within the price.