The contact wheel is 250mm (10”) in diameter and 50mm (1.97”) wide.
Bore of the bearings is 1/2".
A steel spacer sleeve is between the bearings to prevent over tightening.
The core is made from industrial grade aluminum 6061 with 75A duro industrial grade PU rubber coating. The industrial grade PU rubber it has 3 times more lifespan than the natural vulcanized rubber and is ideal for such kind of applications.