for best handling, all else being equal 235/40
for better handling (than stock) and slightly worse acceleration but better ride comfort, 225/45 your odometer and speedometer will also read slightly slow, all else being equal.
a regular simple tire machine will not be able to mount 235/40 onto the stock rim.
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Q: What's the difference between a bolt and a screw?
A: First, you screw. Then, you bolt.