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A little down the road I am planning on putting new tires on my 01 wj and I am slightly confused. I have on their now 245/45R17. If you look at "street" tires all they do is get wider 255 and so on. I am looking at getting bigger ones but am confused to what i should be looking at and what sizes i need to compare. By the time i get the tires i will have 1.5" spacers on all of them and 2" spacers on the suspension, so if anyone has any specific size thatd be awesome too.
 

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Try this website for calculations, the converter works nice. According to that you have 25.7" tall tires. I am not sure but 31's might fit after your mods. There are others on the site here that know better then I.
 

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Keep in mind too, that the tire diameter info is based on the max pressure allowed for any given tire. Most of us have to run them lower to get full road contact and they will not be the rated diameter. Pump them up to max and they will be pretty close.
 
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