Piston Ring Set for the Triumph Tiger Cub, Italian made. Available in 63mm (STD), 63.5mm (+20), 64mm (+40) or 64.5mm (+60). All sizes are in stock. These rings are made for the Italian pistons that we sell, but should fit most Triumph Tiger Cub pistons. The compression rings have a thickness of 1.6mm and the oil control ring has a thickness of 2.4mm.