A tensioner (1, 100), comprising: a first tensioner arm (2, 102) having a shaft member with a first shaft and a second shaft; a second tensioner arm (3, 103), wherein the first tensioner arm (2, 102) is pivotable about a first pivot axis (4, 104) via the first shaft, and the second tensioner arm (3, 103) is pivotally connected via the second shaft to the first tensioner arm (2, 102) so as to be pivotable about a second pivot (5, 105) axis located at a selected distance from the first pivot axis (4, 104); a first wheel (6, 106) rotationally connected to the first tensioner arm (2, 102) about a first rotation axis (7, 102); and a second wheel (8, 108) rotationally connected to the second tensioner arm (3, 103) about a second rotation axis (9, 109), wherein the first and second wheels (6,106,7,107) are configured to engage one endless drive member, wherein the first and second tensioner arms (2,102,3,103) are biased in respective first and second free arm directions; and a spring positioned to bias the second tensioner arm (3, 103) towards a second segment of the endless drive member, wherein at least one of the first (2, 102) and second (5, 103) tensioner arms includes a hub portion defining a spring chamber in which the spring is positioned characterized in that a distance between the first and second pivot axis (5, 105; 4, 104) is so short that the first and second shaft (116, 120) of the first tensioner arm (2, 102) overlap radially. a first tensioner arm (2, 102) having a shaft member with a first shaft and a second shaft; a second tensioner arm (3, 103), wherein the first tensioner arm (2, 102) is pivotable about a first pivot axis (4, 104) via the first shaft, and the second tensioner arm (3, 103) is pivotally connected via the second shaft to the first tensioner arm (2, 102) so as to be pivotable about a second pivot (5, 105) axis located at a selected distance from the first pivot axis (4, 104); a second shaft; a second tensioner arm (3, 103), wherein the first tensioner arm (2, 102) is pivotable about a first pivot axis (4, 104) via the first shaft, and the second tensioner arm (3, 103) is pivotally connected via the second shaft to the first tensioner arm (2, 102) so as to be pivotable about a second pivot (5, 105) axis located at a selected distance from the first pivot axis (4, 104); a first wheel (6, 106) rotationally connected to the first tensioner arm (2, 102) about a first rotation axis (7, 102); and a second wheel (8, 108) rotationally connected to the second tensioner arm (3, 103) about a second rotation axis (9, 109), wherein the first and second wheels (6,106,7,107) are configured to engage one endless drive member, a second wheel (8, 108) rotationally connected to the second tensioner arm (3, 103) about a second rotation axis (9, 109), wherein the first and second wheels (6,106,7,107) are configured to engage one endless drive member, wherein the first and second tensioner arms (2,102,3,103) are biased in respective first and second free arm directions; and a spring positioned to bias the second tensioner arm (3, 103) towards a second segment of the endless drive member, wherein at least one of the first (2, 102) and second (5, 103) tensioner arms includes a hub portion defining a spring chamber in which the spring is positioned characterized in that