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Old 03-31-2014, 08:27 AM   #1
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Easy question

Hi guys, thinking about getting Duratracs for my Wrangler when it comes here in May. I was just wondering what's the difference between the sizes 265/70/17 and 285/75/17? I know my Stock Tire is 255/75/17, I know 17 is the Rim but what's the 200's and 70's for?

Also, I've heard that the 285/75/17 size causes some rubbing at full turns, so I'm gonna play things safe and get the 265 size most likely. I don't want to deal with Spacers and installing them. I'm assuming the 265's will fit fine?

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Old 03-31-2014, 09:45 AM   #2
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The first number is the tire width, measured at the widest part of the sidewalls, in mm. So a 265 tire is 265 mm wide and a 285 tire is 285 mm wide (or 20 mm wider than the 265) at their widest points.

The second number is the "aspect ratio" or the height of the sidewall compared to its width. In your Duratrac examples, the 70 means that the sidewall height is 70% of its width, so a 70 in a 285 (199.5mm) will be higher than a 70 in a narrower 265 (185.5 mm) tire (70% of 285 is greater than 70% of 265).

As for what you can fit on your Jeep, there are loads of threads in this Forum going into great detail about that. Different people have different opinions and different experiences, but it seems that a 285 should fit your JKU, but will possibly rub at full lock and/or full flex (assuming no spacers or lift).

Not to confuse you even more, but another consideration you have to look at is how wide of a tire can you mount on your rims.

Also, just my opinion, but a 265 may look a bit small on a JKU. I am running 285/70/17, which I think are perfect for my needs, but which many on this Forum think is too small. There are lots of picture threads on this Forum that can show you what a particular tire size tire will look like on a Jeep. If you can't find one, post a request looking for it.

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Old 03-31-2014, 11:10 AM   #3
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I looked up the Tire Conversion and agreed, it will look too small. I figured that it would be slightly bigger then the Stock since it was 265, but I am wrong. Stock is 32.1, the 265 is 31.6 inches. I get what you are saying, but am still confused to be honest. Don't think this is something I will get over night.

I have seen the 285/70/17 size, and love the way it looks. What do you mean by full-lock though? I don't anticipate to be doing any major flexing, if at all. I plan to off-road over the summer, but nothing serious, and certainly not rock-crawling.

Thanks for the help foxy.
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Old 03-31-2014, 01:37 PM   #4
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Full lock is when your wheels are fully turned, like when you have to pull into a tight parking spot. If your tires are too big, the inside front wheels may rub against your air-dam or shocks. This is easily fixed by trimming or shaving off some plastic from the air-dam. You can also put washers on your steering stops. This will stop the rubbing, but decrease your tuning radius. Everything is a trade-off.

Other options are wheels with less back spacing (sit further out) or wheel spacers (I'm not a fan of those).

Your best bet is to drive and play with your Jeep for a while. Read this Forum and look at other Jeeps on the road. These modifications are not cheap. Figure out what you like and want, and what your needs are before spending money. For me, half the fun of making changes to my Jeep is figuring out what I want before hand. Enjoy it and ask lots of questions. This Forum is amazingly helpful.
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Old 03-31-2014, 02:12 PM   #5
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Old 03-31-2014, 02:24 PM   #6
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Click image for larger version

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I took this picture a while back, when I was looking for my tires/lift etc. These tires are too large for a this Jeep, even with replacement wheels. And this is a dealer selling a new JKU like this and asking $5,999 for the wheel and tire upgrade that doesn't fit properly! This is why people should do their homework before buying.

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