Hello,
First of all I hope your adapter is from 115mm to 100mm because the spacing from the rims are wider so you will only install 3 out of the 5 lug nuts.
Second, the difference between the two size of tires is how wide they are. To be on the safe size choose the 215. Even that you would have more rubber and cornering with the 225 your turning radius will be shorter plus the rubbing on the fender or other inside parts will be greater.
Enjoy the rims