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If I were you I would be looking up tyre sizes for rim /wheel width fitment and that will give you a guide line of what size tyres you can put on a 9`` wide wheel legally, mind you it also comes back to the compliance plate for wheel and tyres sizes. Not that if your close to legal that you won't have too many issues unless you have a accident and the good old insurance company wants an excuse not to pay up. ( Note that being a long shot but it is possible )
Last of all what every size you go for also check the load rate and speed rate of that tyre as different brands have different ratings even on the same size tyres,it depends on the brand etc.
Cheers
Geoff
 

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With some feed back on maximum tire size that fits without rubbing or looking like a fat lady after a buffet, then I'll look at what's available in those sizes. I'm not concerned about insurance companies.
 

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I need some advice … I have a 2016 300S hemi and I need tires asap. Can I run wider tires all around like a 255 or 265/40 20 without spacers or does it have to be closer to the stock 245/45 20? I appreciate the help 👍

Update: I found this site and it calculates the plus sizes for you. It’s saying I can go to 255/40R21 from my stock 245/45R20. Anyone know how accurate this is ?

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