Albion’s wheel hardness is based on the material and durometer needed. See the chart and details below to see the comparison.

Tread MaterialDurometerScale
Soft Tread Rubber70–80A
Hard Tread Rubber75–85D
Phenolic145–150R
Polyurethane90–95A
80A Polyurethane80–85A
70 D.H.L. Polyurethane70D
Rubber70–80A
Gray Rubber70–80A
Semi-Hard Pneumatic90–100A
Neoprene65–75A
Pneumatic55-60A