SICE S 52A Manual De Instrucciones página 38

More Difficult Tire/Wheels
Place one bead roller into the outboard position of the tire carriage.
Tire not shown for clarity.
Move the outboard bead roller into the working position.
Use the inboard/outboard and up/down controls to bring the roller against the sidewall of the tire.
The wheel rim should be no more than 3/16" (5 mm) from the top of the bead roller.
Press the bead roller lightly against tire.
NOTE: Lubrication is essential for safe & easy demounting.
While rotating the wheel in either direction, generously lubricate the tire bead area and slowly push the tire bead off of
the wheel.
38 S 52A Operator's Manual