Constant velocity joint, comprising: an outer joint part with a longitudinal axis and outer ball tracks, wherein the outer joint part has an attachment side and an opening side, an inner joint part with a longitudinal axis and inner ball tracks, wherein respectively an outer ball track and an inner ball track form a pair of tracks (22, 23) with each other, a torque-transmitting ball in each pair of tracks (22, 23), a ball cage which is arranged between the outer joint part and the inner part and comprises circumferentially distributed cage windows which each receive at least one of the torque-transmitting balls, wherein the balls define a joint center plane by the ball cage when the longitudinal axes (L12, L13) of the inner joint part and the outer joint part are coaxially aligned, wherein the two longitudinal axes (L12, L13) define a joint articulation plane at articulation angles (β) other than zero degrees (0°); wherein, viewed in the joint articulation plane, in any angular position of the constant velocity joint an opening angle (δ) is formed between an outer tangent, which is applied to the outer ball track in an outer contact point between the outer ball track and the ball, and an inner tangent (T'), which is applied to the inner ball track in an inner contact point between the inner ball track and the ball, wherein the centers of the balls each define a center point line (A, A') when moving along the outer and inner ball tracks (22, 23), wherein, furthermore, a first articulation angle range is defined comprising articulation angles (β) less than twenty degrees (-20° < β < 20°), and wherein a second articulation angle range is defined comprising articulation angles (β) greater than twenty degrees (β < -20° and β > 20°), wherein at least some of the pairs of tracks (22, 23) are configured such that: - an attachment-sided opening angle (δa) of a ball moving in the joint articulation plane towards the attachment side of the outer joint part increases within the first articulation angle range with increasing articulation angle (β), wherein an attachment-sided first mean opening angle increase of the attachment-sided opening angle (δa) is defined over the articulation angle (β) within the first articulation angle range, - wherein the attachment-sided first mean opening angle increase of the first articulation angle range is greater than an attachment-sided second mean opening angle increase of the second articulation angle range. an outer joint part with a longitudinal axis and outer ball tracks, wherein the outer joint part has an attachment side and an opening side, an inner joint part with a longitudinal axis and inner ball tracks, wherein respectively an outer ball track and an inner ball track form a pair of tracks (22, 23) with each other, a torque-transmitting ball in each pair of tracks (22, 23), a ball cage which is arranged between the outer joint part and the inner part and comprises circumferentially distributed cage windows which each receive at least one of the torque-transmitting balls, wherein the balls define a joint center plane by the ball cage when the longitudinal axes (L12, L13) of the inner joint part and the outer joint part are coaxially aligned, wherein the two longitudinal axes (L12, L13) define a joint articulation plane at articulation angles (β) other than zero degrees (0°); wherein, viewed in the joint articulation plane, in any angular position of the constant velocity joint an opening angle (δ) is formed between an outer tangent, which is applied to the outer ball track in an outer contact point between the outer ball track and the ball, and an inner tangent (T'), which is applied to the inner ball track in an inner contact point between the inner ball track and the ball, wherein the centers of the balls each define a center point line (A, A') when moving along the outer and inner ball tracks (22, 23), wherein, furthermore, a first articulation angle range is defined comprising articulation angles (β) less than twenty degrees (-20° < β < 20°), and wherein a second articulation angle range is defined comprising articulation angles (β) greater than twenty degrees (β < -20° and β > 20°), wherein at least some of the pairs of tracks (22, 23) are configured such that: - an attachment-sided opening angle (δa) of a ball moving in the joint articulation plane towards the attachment side of the outer joint part increases within the first articulation angle range with increasing articulation angle (β), wherein an attachment-sided first mean opening angle increase of the attachment-sided opening angle (δa) is defined over the articulation angle (β) within the first articulation angle range, - wherein the attachment-sided first mean opening angle increase of the first articulation angle range is greater than an attachment-sided second mean opening angle increase of the second articulation angle range. - an attachment-sided opening angle (δa) of a ball moving in the joint articulation plane towards the attachment side of the outer joint part increases within the first articulation angle range with increasing articulation angle (β), wherein an attachment-sided first mean opening angle increase of the attachment-sided opening angle (δa) is defined over the articulation angle (β) within the first articulation angle range, - wherein the attachment-sided first mean opening angle increase of the first articulation angle range is greater than an attachment-sided second mean opening angle increase of the second articulation angle range.