Studded tyre having sipes

A tyre, comprising:

• a tread comprising tread blocks such that grooves are arranged between the tread blocks;
• and
• studs installed into at least some of the tread blocks;
• wherein:
• a central region of the tread is arranged between a first shoulder region of the tread and a second shoulder region of the tread, the central region comprising a circumferential central line of the tread,
• at least some of the tread blocks of the central region are provided with sipes, such that the tyre has a first density of sipes, the first density of sipes being defined as a total length of the sipes arranged in the central region divided by an area of the central region,
• at least some of the tread blocks of the first shoulder region are provided with sipes, such that the tyre has a second density of sipes, the second density of sipes being defined as a total length of the sipes arranged in the first shoulder region divided by an area of the first shoulder region,
• at least some of the tread blocks of the second shoulder region are provided with sipes, such that the tyre has a third density of sipes, the third density of sipes being defined as a total length of the sipes arranged in the second shoulder region divided by an area of the second shoulder region,
• the first density of sipes is at least 15% greater than either or both of
• the second density of sipes, and
• the third density of sipes;
• at least a part of one of the studs is arranged in a stud hole provided in one of the tread blocks;
• and
• the tread comprises rubber material having a Shore hardness in the range 48 to 59 Sh(A) as measured with durometer type A, at a temperature 23° C.