Bicycle disc or spider wheel (10, 510, 610, 710, 810), comprising: - a hub (12, 512, 612, 712, 812), - a rim (14, 114, 214, 314, 414, 514, 614, 714, 814) having a radially outer tire-coupling region (26, 126, 226, 326, 426, 526, 626, 726, 826), a first sidewall (52, 152, 252, 352, 452, 552, 652, 752, 852), and a second sidewall (54, 154, 254, 354, 454, 554, 654, 754, 854), - a pair of disc or spider wheel-type structural elements (16, 116, 216, 316, 416, 516, 616, 716, 816; 18, 118, 218, 318, 418, 518, 618, 718, 818) integral with the hub (12, 512, 612, 712, 812) and with the rim (14, 114, 214, 314, 414, 514, 614, 714, 814), wherein said structural elements (16, 116, 216, 316, 416, 516, 616, 716, 816; 18, 118, 218, 318, 418, 518, 618, 718, 818) are pretensioned, - the wheel (10, 510, 610, 710, 810) having an axis of rotation and a median plane extending orthogonally to the axis of rotation at an axially intermediate point of the radially outer region (26, 126, 226, 326, 426, 526, 626, 726, 826), and at an axially intermediate point of the hub (12, 512, 612, 712, 812), - wherein the first sidewall (52, 152, 252, 352, 452, 552, 652, 752, 852) extends on a first side of the wheel (10, 510, 610, 710, 810), with respect to the median plane, on which a component of a motion transmission system or, when there is none, a disc of a disc brake is provided at the hub (12, 512, 612, 712, 812), and the second sidewall (54, 154, 254, 354, 454, 554, 654, 754, 854) extends on the opposite side, with respect to the median plane, characterized in that the first sidewall (52, 152, 252, 352, 452, 552, 652, 752, 852) of the rim (14, 114, 214, 314, 414, 514, 614, 714, 814) has a minimum distance (d min) from the median plane smaller than the second sidewall (54, 154, 254, 354, 454, 554, 654, 754, 854) of the rim (14, 114, 214, 314, 414, 514, 614, 714, 814). - a hub (12, 512, 612, 712, 812), - a rim (14, 114, 214, 314, 414, 514, 614, 714, 814) having a radially outer tire-coupling region (26, 126, 226, 326, 426, 526, 626, 726, 826), a first sidewall (52, 152, 252, 352, 452, 552, 652, 752, 852), and a second sidewall (54, 154, 254, 354, 454, 554, 654, 754, 854), - a pair of disc or spider wheel-type structural elements (16, 116, 216, 316, 416, 516, 616, 716, 816; 18, 118, 218, 318, 418, 518, 618, 718, 818) integral with the hub (12, 512, 612, 712, 812) and with the rim (14, 114, 214, 314, 414, 514, 614, 714, 814), wherein said structural elements (16, 116, 216, 316, 416, 516, 616, 716, 816; 18, 118, 218, 318, 418, 518, 618, 718, 818) are pretensioned, - the wheel (10, 510, 610, 710, 810) having an axis of rotation and a median plane extending orthogonally to the axis of rotation at an axially intermediate point of the radially outer region (26, 126, 226, 326, 426, 526, 626, 726, 826), and at an axially intermediate point of the hub (12, 512, 612, 712, 812), - wherein the first sidewall (52, 152, 252, 352, 452, 552, 652, 752, 852) extends on a first side of the wheel (10, 510, 610, 710, 810), with respect to the median plane, on which a component of a motion transmission system or, when there is none, a disc of a disc brake is provided at the hub (12, 512, 612, 712, 812), and the second sidewall (54, 154, 254, 354, 454, 554, 654, 754, 854) extends on the opposite side, with respect to the median plane,