Spitfire Bighead 52mm 99a Skateboard Wheels. Classic Bighead logo for less flatspots and a faster ride and less hookups in the street. Yeah they're fast wheels. The 52mm size will maintain a solid roll on the flat and good momentum for technical tricks. The bearing core is center-set so you can reverse the wheel to save the graphic or to maintain a longer life by rotating your wheel placement over the life of the wheel. This is handy when you slide your wheel often particularly in urban terrain that can wear your wheels in an uneven way.