Bones SPF Linear Wheels 54mm 81B

Bones SPF Linear Wheels 54mm 81B

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Bones SPF Linear Wheels 54mm 81B

Skatepark Formula™ (SPF) is very high quality urethane specifically formulated to resist flatspotting on slick or smooth surfaces while maintaining a higher rebound for a quicker response and a faster roll.

81B = 101A in hardness. B-Scale is similar to A-Scale but gives more insight into the urethane hardness rating.

  1. It is very similar to the A Scale, but reads 20 points lower, allowing the useful scale to be extended by 20 points, which covers the entire hardness range of skate wheels in one scale. It uses the same soft spring as the A Gauge, but the conical gauge needle of the D Scale.
  2. Because the spring is soft, the B Scale gauge needle does not puncture the skin of the wheel surface, resulting in the same reliable reading as the A Scale does.

1 Set of (4) Wheels
Wide wheel for larger contact patch 37mm
Bearings not included