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Never seen 21s on a G42, so am interested to see where you go with this. When do you get your car?
You'd need to go down to a 25 profile tyre. This would be suicide in the UK due to the state of the roads, but perhaps they are better where you are. A quick search suggests that tyres are not available here in 245/25/21 or 255/25/21, so perhaps check this out before pressing the button on 21s. You could stick at 30 profile tyres, but you rolling radius would then be 25mm greater and your speedo would be out. Not sure if it would also throw some error codes.
The comments about widths and offsets above still apply. If you want a more aggressive offset and to drop it as low as possible on the MSS, you may need camber plates.
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