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Discussion Starter · #1 · (Edited)
Okay, so two weeks ago I purchased an 07 Dodge Charger SE. It came with the 215/65/17 Goodyear Integrity tires. According to Tire Rack, the diameter of that tire is 28.1". I have been searching and reading post about 20" wheel swaps. Everyone keeps suggesting 245/45/20 or 255/45/20 for anyone who asks. According to Tire Rack, once again, the diameter of that 245/45 averages around 28.7 (28.6-28.9 with most brands). That tire is taller, though not by much, than the stock 215/65/17 on the SE. But if you check the 255/40/20's, they are 28.1, which is an exact match.... shouldn't that be the tire size recommended to replace your SE's with 20's. Also, 265/30/22's are right at that 28" diameter, but I can understand going with the 35 for a better ride quality and tire wear.

On another note the stock SRT, I have read, come's with 245/45 in front and 255/45 rear. I would think that the computer is calibrated to the 255/45 on the SRT which is right at 28.9" diameter.
I am new here and don't mean to make waves, and would like to understand why (it appears to me), the wrong size tires are consistantly being recommended. Having the wrong size tire's changes the actual speed that you are going, along with the actual miles on your vehicle. Does anyone get their speedo's recalibrated at the dealership after going up on size? Most cars now have that capability if programmed, to adjust to the size tire being used (within reason).
So from what I can tell, more accurate would be:

Stock +3 +5
215/65/17---------255/40/20-------255/30/22
Stock +2 +4
225/60/18---------255/45/20-------265/30/22

Thanks, Mo
 

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The SRT8 comes with either the staggered Goodyear F1's (245/45/20 front & 255/45/20 rear) or the Goodyear RSA (245/45/20) all the way around for the colder climates. I'm not an expert by any means but those are the recommended sizes.

Now, I am looking at replacements for mine and will probably go with the Kumho tires in the recommended stagger. However, some people are goiing with the 275/40/20 for the rears which is a very close match. Since I need an ASR tire here in Wyoming, my options for this are limited by funds.

That probably doesn't help much but I thought I'd jump in anyway.
 

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Actually, I'll recant what I said a bit. I can get the Toyo Proxes 4's in a great stagger of 245/45/20's for the front and 275/40/20's for the rear for about the same price as the Kumho's.

Not sure what to do now.
 
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