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235/40/17 is roughly the same rolling radius as 225/45/17
Is not.

235/40/17 = 310mm = -2,3% = too much
225/45/17 = 317mm
245/40/17 = 314mm = -1% = acceptable
255/40/17 = 318mm = +0,2% = perfect for 17X9 (if they fit to evo 5).
 

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245/40/17 would be perfect IMO. Even that width can sometimes look slightly stretched on a 9" rim. The rolling radius is *similar* but just slightly less which is no bad thing.

A 255/40/17 is identical to a 225/45/17 however, though I wouldn't go to that size (the 245 will be better for clearance and looks).
 
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