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[AWe93]

Would 8.5x19 et25 and 10.5x19 et25 work for a stock e93 m3?

[RE36TRO]

The fronts are too narrow with that offset. To put into perspective, a 10" wide front ET25 with a 5-10mm spacer is commonly ran while still being flushed. The rears are fine however some may also say the 8.5 and 10.5 variance would hinder handling.

[ApexWheels]

Originally Posted by AWe93

Would 8.5x19 et25 and 10.5x19 et25 work for a stock e93 m3?

This setup would fit, but it wouldn't be ideal. The 8.5" wide wheel up front is the same width as the narrowest OE front wheel option while you are making the rear wheel a full inch wider. This will increase the car's tendency to understeer compared to the stock setup which is itself already prone to understeer.

-Tom