The most common way to distinguish is labeling. When it comes to mass production of wheels, the service mark, which in most cases is applied to the inner surfaces of the wheels, convex (spilled) one is in molded disk, and in wrought – dent (stamped).
The next feature that allows you to indirectly distinguish forged wheels from the alloy – the shape and weight. Forged wheels must undergo special treatment in the milling and turning equipment, therefore, tend to have a flat (chiseled) form. However, it should be recognized that this difference becomes less marked in recent years. Furthermore, a good forged wheel is significantly (by 20-30%) easier than the alloy analog. The latter characteristic (weight) applies only really expensive and high-quality drives, because the weight of cast and forged wheels, for example, produced in Russia, is almost the same.
And the last sign by which you will be able to indirectly assess what the chances of the proposed wheel to be forged is price. Quality forged wheels are much more expensive than alloy one.