ST-AKAI PR1 Pinch Roller Tire

Tires for AKAI Reel to Reel Pinch Roller part number 20494, used on
reel to reel models 150, 1721, 1722 and 4000 series.
Akai made two versions of pinch roller part number 20494.
Both versions had the same outside diameter. Both fit on the same shaft.
But the diameter of the aluminum hubs that the tires were mounted on were different.

If the hub’s outside diameter is 1.25 inches, order tire #ST-AKAI-PR1

If the hub’s outside diameter is 1.16 inches, order tire #ST-AKAI-PR2