Can't say from experience, but 6.5 may be a touch narrow for 225s. I'd say 215 is as wide as you can really go on those.
If you want wider tires, get a bigger rim, say a 17x7 or 17x7.5, then go up to 225 or 235. My 2 cents.
If you want wider tires, get a bigger rim, say a 17x7 or 17x7.5, then go up to 225 or 235. My 2 cents.