Spitfire Formula Four Skateboard Wheels Conical Full 101DU Natural 54mm truck-size-5-25-139-147 High speed nylon ball retainer

High speed nylon ball retainer provides added strength and speed

Heavy Duty high impact caps with countersunk no snag rivets

Spitfire bigheads feature a wider riding surface ensuring stable riding

4140 chromoly steel axles and grade 8 kingpins

Skateboarding's first shield free design bearings

Spitfire Formula Four Skateboard Wheels Conical Full 101DU Natural 54mm truck-size-5-25-139-147 High speed nylon ball retainerSpitfire Formula Four Skateboard Wheels Conical Full 101DU Natural 54mm Features : 54mm diameter, 34mm overall width with a 22mm riding surface. Ultilizing a wider riding surface and cutaway design for unmatched control and lasting speed on all surfaces. 101duro hardness makes these grippy without the loss of speed. Spitfire's unmatched true performance flatspot resistance wheels.