A one-piece brake disk (10) for a vehicle includes a radially inner annular portion (20) having a plurality of circumferentially located mounting holes (24) defining a mounting circle (MC); a radially outer annular portion (28) concentric with the radially inner annular portion (20) and having opposite braking surfaces (32, 34); and a plurality of connecting arms (38) extending from an inner peripheral surface (42) of the radially outer annular portion (28) to an outer peripheral surface (43) of the radially inner annular portion (20). Each of the plurality of connecting arms is tangent to an effective circle (EC) concentric with the mounting circle (MC), wherein the effective circle (EC) has a radius greater than a radius of the mounting circle (MC).
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