Tread block arrangement suitable for tyre or for tread band for tyre, the tread block arrangement comprising first sipe delimited by first sipe wall and second sipe wall. On first sipe wall, first wall groove or primary first wall step defines first sipe deflection line, and second wall groove or secondary first wall step defines second sipe deflection line. On the second sipe wall first wall ridge or primary second wall step and second wall ridge or secondary second wall step is provided. First sipe deflection line extends between the bottom and top opening of the first sipe such that at least part of the first sipe deflection line is straight and extends inclined. Second sipe deflection line extends between the bottom and the top opening such that that at least part of the second sipe deflection line is straight and extends inclined. Lamella plate for producing the first sipe.

A tyre comprising a tread comprising a tread block, the tread block delimiting a first sipe. The tread block is configured to be alternately in a first state and in a second state. The first sipe comprises first primary sipe portion and first secondary sipe portion, and the first primary sipe portion comprises a first top hole, a first throat, and a first bottom cavity, the first bottom cavity being delimited by a portion of the bottom, and the first throat being arranged between the first top hole and the first bottom cavity. In the first state, the first throat is open for fluid and/or snow to flow from the first top hole to the first bottom cavity, and in the second state, the first throat inhibits fluid and/or snow from flowing from the first bottom cavity to the first top hole. A lamella plate for forming such a sipe.

A tire mold segment containing a mold surface with a plurality of groove forming and sipe forming protrusions arranged to form tread portions of tires. At the end faces of the tire mold segment, the portion of sipe forming protrusions with an end that terminates at or near the mold segment end face have an increased width to provide a countermeasure against irregular tread wear and tire noise. The sipe forming protrusions having an end that terminates at or near a tire mold segment end face have a width of about 0.7 mm or more. The remaining sipe forming protrusions positioned on the tire mold segment can a reduced thickness to accommodate high sipe density tread designs.