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How do you know that they use the "best quality casting process", in comparison to?
I read a lot about wheels.
Twice, I have come across articles where MRR was cited as using the the best casting process.
There are several of them. I can't name them all but one is pouring the metal into a mold (like pouring a glass of beer). Another is injecting the metal. There are a few others but some create bubles and impurities that weaken the final product. MRR does which ever one that produces strong wheels. Same one used by many high end wheel makers like Maya, Work and Lowenhart. They've been making oem wheels for over 20 years but now are into the aftermarket.
I think the wheels are so so as far as a 5 star design. I also think they will be perfect for your wife. As you said she is hard on her wheels and I dont think she needs a expensive 3 piece wheel.
I like the rims alot man, Congrats to you and the wifey, If they were chrome, i'd get them tomorrow, LOL. I bought my financee TSW 19s for her 335, 2 out of the 4 rims were bent in 3 weeks, I have to sell them now, she always rides the car hard, LOL. When I'm in the GS, i just cruise slow and watch for potholes. She is on stocks for now.