Question about 2001 Jeep Grand Cherokee

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Wrong tire size?

I need to buy 2 new tires because mine have been going flat. When I went to shop around for new tires, I realized that the ones on the car are not the ones recommended by the manufacturer. The ones on there now are P235/65/R17. The car lists P225/75/R16 as the tire that should be put on. I need to buy 2 new tires, which size should I buy? Also, could having these different sized tires on my car for the last 2 years have harmed the car in anyway?

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P designates a tire for a passenger car, 225 is the width of the tire in mm, 75 is the ratio of sidewall height to the width (eg thesidewalls are 225*0.75=168.75 mm tall), R is the type of tire (radial), and 16 is the diameter of the tire in inches. Customizing the tires gives you different performance results.

If you want your car to act according to how the manufacturer specified, go back to the stock tires. However, your current tires have a larger diameter than the stock, which means your rims are also larger than stock; you would probably have to replace the rims as well, which can be expensive.

I would stick with your new sizes. Different sized tires will not harm your vehicle in any way. I would also recommend going to a store that offers lifetime warranties like Les Schwab; they are invested in insuring that that everything is fitting correctly so they don't have to refund you anything.

Posted on Feb 14, 2014

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Posted on Jan 02, 2017

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Mikey108
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SOURCE: 1996 jeep grand cherokee ltd problem with transfer case because of different size tires

You should have the same size tires in the front and back. By having 2 different sizes, you are changing the gear ratios between the front diff. and rear diff. You could wipe out the t-case especially if it is full time 4wd.

Posted on Nov 06, 2008

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What wrong?


Hi Axer,

The Range Rovers have permanently engaged Four Wheel Drive. If the tires are different sizes, they're spinning at different rates. Or trying to.

If you were off-road, it wouldn't matter too much, but on paved road, where the tires tend to grip not slip, these different rates subject a locked drive train to tremendous stress. This can bind up the gearing in the transfer case. Hopefully after only ten minutes, no permanent damage was done.

You can relieve this stress by jacking one end completely off the ground. Front or back. As the tires lose their grip on the road, you should see them spin slightly. That's good news. Once released you should be able to move again.

While it's in the air, you should probably put the original size tires back on. So choose which end to jack accordingly.

Comment me back to let me know how it goes.
Good luck

Mike



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