[STD 56mm]
Bore/Piston Outer Diameter: STD (2.2 inches / 56 mm) / Plus 0.25 (56.25 mm) / Plus 0.5 (56.5 mm) / Plus 0.75 (56.75 mm) / Plus 1 (57 mm) - Piston Pin Outer Diameter: 16mm -Ring Thickness: 1.2*1.2mm - Piston Compression Height: 27mm