Need tire help on my G35

My G35 stock 17" tires are in need of replacing. The current tire size is 215/55/17. These tires are no where near wide at all. I was wondering if I can use 225/50/17 tires? Besides the speedo/odometer being off, is there any safety concerns? Thank you!

Not looking into spending too much money on tires for this. I've been told 235/50/17 is the closest to the 215 tires in height but they cost a lot more.
 
Yeah the stock 17's are tiny.

i don't want to spend too much money on this car. A nice set of decent 18" Infiniti stock wheels with tires will run me $800. So I'm just looking to get new tires on for now.
 
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