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HEy I have the stock 18's on my rt that i got powder coated i want to say the stock size is 225/60/18 but i could be mistaken. I want to put wider tires on the back end than the front end does anyone know the max i could go without rub
 

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You can go out to a 275 width. I think you would need to go to 50 series to be close to the stock circumference to prevent speedo issues. I'm lowered and running 275/40/20 with no clearance issues. If you have a predator you can update the tire size to recalibrate your speedometer to be correct. The difference in the size I just told you on a stock 18 inch rim is 89.9 stock circumference vs. 90.6 on a 275/50/18. I would look for someone else running that tire size before you buy them just to get some quick feedback.
 
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