i would go for 225 or even 235 on a 8.5 rim. lot of guys streach them on the vw scene and drift car. it should give you less tyre flex as you are streching the sideways and they can't move.
i like the look of steched tyres to be fair but not overly streched. i would go for 225 as that will look quite streched anyway and go for a lower profile.
Re: can i fit 215 instead of 225 tyres on 8.5 inch
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#822505 28/04/200921:2628/04/200921:26
As far as width is concerned yes. The standard rims are 7.5" and the standard tyres as fitted by fiat were either 205 or 225 so anything in this range will be fine.
Isn't the standard rims 16x7"? Now I'm not 100% sure, but I seem to recall that being stamped into the set I used to have.