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This is a great question. Many assume OEM wheels are the end-all be-all of quality and strength. While OEM wheel quality is very consistent, they are always susceptible to bending if they take a hard enough impact in the right spot, regardless of manufacturing process (cast, flow-formed, forged, etc).
The best thing you can do is be an informed buyer. Do research on any aftermarket wheel company you're considering. Ask what certifications their wheels have, such as VIA, TÜV, etc, and ask them to prove it by showing their certificates or registration numbers. Look into load ratings as well, as these are the prime indicator of a wheel's strength.
Lastly, diameter makes a big difference since it directly effects how much cushion (tire sidewall) is between your wheels and the road. 19" wheels have very little protection while 17s will have much more.
Hope this helps!
--Dylan
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