I have a 98 Durango 5.9L and it currently has 31x10.5x15's on there. I am gonna be upping the wheel size to 18's. How do I figure the tire size to put on there. I will going to the triple digit size. I believe the equivalent of what I have now is 235/75/R15. Any help would be awesome! Thanks.
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I can do the metric size conversion. That's why I know the equivalent size. You think its 215/65/R18? I wasn't quite there huh? Lol! Appreciate all the help guys. That calculator will be handy for getting the right size on my Ranger too. It's all jacked up. It's lowered like 3 inches and the tires are the wrong size. We just bought like this, its a mess. Lol. Has the speedometer thrown off by 15-25mph. Terrible.
Vehicle: 2011 5.7 AWD Citadel Durango and 2012 T&C
Location: Summerset, SD
215/65/r18's are less than 29 inches in diameter and are pretty skinny for the D IMO. Someone please correct me if I'm wrong, but I'm pretty sure you can only program the computer for a combination of tire sizes 31/10.5/15, 235/75/15 or equivalent and gearing of 3.92 and 3.55. That's why if you really check into the available tuning options from Hypertech and others, they don't offer speedo recalibration (I have one for mine).
I just did. I was only 2 sizes off with my guess. Sweet. Lol. I am inclined to agree with ZCR about the speedo thing. I am not too worried about it, I run diagnostics and such with the Torque APP on my phone. It's amazing that toy. Lol. So it'll tell me if my speed is off and by how much, then I'll go from there if its worse the 10mph off.