Balance wheel (5, 15, 35, 35', 35", 55) comprising a rim (14, 34, 54) connected to a hub (11, 31, 51) by means of at least one arm (12, 32, 52), the balance wheel (5, 15, 35, 35', 35", 55) comprising an adjustable auxiliary temperature compensation system (13, 33, 33 1, 33 2, 33 1 ', 33 2 ', 53) mounted in the space defined by the rim (14, 34, 54), enabling the temperature compensation of the balance wheel (5, 15, 35, 35', 35", 55) to be adjusted, the temperature compensation system (13, 33, 33 1, 33 2, 33 1 ', 33 2 ', 53) comprising: - a bimetallic strip device comprising: -- at least one first strip and at least one second strip, said at least one first and at least one second strips each having different expansion coefficients and are arranged such that they are attached on top of one another to ensure that the curvature of the bimetallic strip device varies as a function of temperature, the bimetallic strip device extending between a first end and a second end, and -- a block (24, 44, 64) forming an integral part of one of the ends of one of said at least one first and at least one second strips making it possible to increase the influence of the adjustable auxiliary temperature compensation system (13, 33, 33 1, 33 2, 33 1 ', 33 2 ', 53); - a fixing device forming an integral part of the first end of the bimetallic strip device, the fixing device comprising adjustable orientation means configured to change the orientation of the compensation system with respect to said at least one arm (12, 32, 52) of the balance wheel (5, 15, 35, 35', 35", 55). - a bimetallic strip device comprising: -- at least one first strip and at least one second strip, said at least one first and at least one second strips each having different expansion coefficients and are arranged such that they are attached on top of one another to ensure that the curvature of the bimetallic strip device varies as a function of temperature, the bimetallic strip device extending between a first end and a second end, and -- a block (24, 44, 64) forming an integral part of one of the ends of one of said at least one first and at least one second strips making it possible to increase the influence of the adjustable auxiliary temperature compensation system (13, 33, 33 1, 33 2, 33 1 ', 33 2 ', 53); -- at least one first strip and at least one second strip, said at least one first and at least one second strips each having different expansion coefficients and are arranged such that they are attached on top of one another to ensure that the curvature of the bimetallic strip device varies as a function of temperature, the bimetallic strip device extending between a first end and a second end, and -- a block (24, 44, 64) forming an integral part of one of the ends of one of said at least one first and at least one second strips making it possible to increase the influence of the adjustable auxiliary temperature compensation system (13, 33, 33 1, 33 2, 33 1 ', 33 2 ', 53); - a fixing device forming an integral part of the first end of the bimetallic strip device, the fixing device comprising adjustable orientation means configured to change the orientation of the compensation system with respect to said at least one arm (12, 32, 52) of the balance wheel (5, 15, 35, 35', 35", 55).