Bones Wheels SPF

The 81B rating indicates a very hard wheel, specifically designed for skatepark performance. This hardness allows for maximum speed and slide control on smooth concrete or wood surfaces, though it will feel less forgiving on rough street terrain.

The P5 sidecut is a versatile profile that balances stability with responsiveness. It provides a wider contact patch for grip during turns while maintaining enough agility for technical tricks and grinds.

Yes, the Skatepark Formula (SPF) urethane is specifically engineered to resist flat-spotting. This makes them a reliable choice if you frequently perform power slides or tricks that put significant, concentrated pressure on the wheel surface.

These are primarily designed for skateparks. Their hard durometer and specialized formula thrive on smooth, polished surfaces, whereas they may feel harsh and vibrate excessively on rough asphalt or cracked street pavement.

A 58mm wheel is on the larger side, which provides more speed and momentum but adds a bit of weight compared to smaller street wheels. While it won't prevent you from doing tricks, you may notice a slight difference in pop height and board weight compared to a 52mm or 54mm setup.