Bones Skatepark Formula™ (SPF) Sidecut Wheels - 54mm 104A

54mm by 31mm wide, in Skatepark Formula. It is the size for those who spend their session at the park but don't want to give up flip tricks: the wheel is large enough to handle transitions and low enough for the board to remain responsive on flat ground.

SPF was developed by Bones with concrete in mind. Concrete heats up the wheel and eats urethane, and this formula handles that abuse without getting flat spots or having the surface torn up after half a dozen sessions.

The spec sheet lists the hardness in two ways, 84B and 104A. It is the same value. Bones measures hard wheels on the B scale, which reads twenty points lower than the A scale. It is one of the hardest ones made: it doesn't deform, it rolls fast, and it slides without catching.

Sidecut shape, White color.

• Wheel Diameter 54mm
• Wheel Width 31mm
• Wheel Hardness 84B = 104a
• Wheel Formula SPF
• Wheel Color White
• Wheel Suggested Use Skateparks
• Wheel Surface Smooth
• Wheel Shape P5

Sold as a set of 4.