Question about 2001 Jeep Grand Cherokee

# 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

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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## Related Questions:

### I went and got two new tires for my chevy aveo and I gave them the tire size 185/60r14 and they came back and told me my rims were 15inches not 14inch so they put on 185/60r15. Now my back tires are...

Except for the 2004's, every year of Chevy Aveo can come in either 14- OR 15-inch rims, but they don't come in both.

They put on 185/60's instead of 185/55's.
This defines the profile height of the tire.
So yes, it is slightly "taller" (by about 9.25 mm).
Yes it is the wrong tire for that car.

It should have either: 1) 185/55-15 OR 2) 185/60-14.
(Note: Some people will up-size and put 185/60-15 all the way around, but that is the owner's choice; obviously not yours).

Do NOT allow them to mix the tires under any case.
It can cause handing problems and will not allow you to rotate the tires properly (though you only bought two).

Be a strong consumer and demand satisfaction.

Mar 19, 2015 | Chevrolet Aveo Cars & Trucks

Tip

### How to pick the right tires for your vehicle

on Jun 19, 2010 | Honda Accord Cars & Trucks

### Have a 2009 Malibu, tires are excellent condition. warning light came on "low air right front tire, put air in and week goes by and comes on again, we take it to Sears to check it and also rotate the...

Either someone is letting the air out of your tire or it has a leak. Obviously the shops you have taken it to are incompetent if they can't find a leak. A good shop will submerge the tire and rim in a vat of water and look for air bubbles. If you have alloy rims, occasionally the rim may have "porosity" where the air bleeds out thru the center of the rim between the tire beads. A good rim shop will have sealant that is sprayed or brushed on the rim center to seal it.

Feb 12, 2015 | 2009 Chevrolet Malibu

### I have a 1964 Plymouth Valiant - 225 slant 6 - no power steering. When I drive on the freeway, it's like driving on ice, difficult to keep it in a lane. Air pressure in tires are eqal all around. What...

over inflated tires.
go to any tire shop after trying tire at door jam (drivers) stated pressure. get aligment check
this car is a man killer, fix it now, save some lives.

or wrong tries, using huge tires on car, can cause tires to crown,
and need very low pressure to correct.
seen this on 4wd cars with insane size tires way too many times.
ask. if tires are not stock size, say what yours are.

Jul 15, 2014 | 1983 Plymouth Gran Fury

### Can you put fix a flat in a nitrogen tire?

Yes, you can put fix a flat in a nitrogen tire. Just remember that fix a flat is often a temporary fix and you should get the tire properly patched or replaced. I have heard of people driving forever with fix a flat and some where they just make it to a mechanic's. Good luck! http://www.xlautony.com/products

Jan 31, 2013 | Chrysler Cars & Trucks

### How many cans of fix a flat can i put in one single tire?

it depends on if you want to be able to fix the tire. the compound in fix-a-flat will keep the patch from sealing inside the tire.
so instead of a \$15 repair, it might be a \$120 tire.

Apr 09, 2012 | 2002 Chevrolet Silverado 1500HD

### My girlfriend has an 01 Impala that just keeps costing me. Ive fixed several things and worked my way around others. The LOW TIRE PRESURE light keeps coming on even though there are pretty good tires all...

For the engine noise, all I can tell you is that you must locate the source of the noise. You probably have a bad bearing, worn out alternator, or something similar. You should try removing the serpentine belt and start the engine to see if the noise is still there. If it is, then there is something wrong internally like a timing chain or something. If the noise is gone, then you need to inspect all the pullies that are driven by the serpentine belt including alternator, power steering, A/C, idler pulley, tensioner pully, etc.

The tire pressure monitor system (TPMS) can be pretty picky.

1. Check all of your tire sizes to make sure they are all the same size. I have seen many problems with people putting used tires on the vehicles that don't match the other tires in size. I have also seen this caused by tires that are the same numerical size but one is new and the rest are worn-out causing a difference in the circumference of the tire. This makes the tires rotate at different speeds and makes the TPMS "think" there is a low tire.

2. the tire pressures need to be checked with a GAUGE. You could have one or more tires OVER INFLATED and this will also cause the light to come on. I have seen lots of problems with people that keep adding air to the tires, but don't ever use a gauge (they just use the "eyeball gauge"). This does not work with a TPMS. They ALL need to be inflated to the pressure that is on the lable inside the drivers door. They also must all be within 2 Psi of each other.

NOTE: After adjusting tire pressures, it can take up to 30 minutes of straight line driving to get the light to go out. Do not expect it to go out right away, it is not going to happen unless you reset the TPMS with a scan tool.

If you are certain that the problem is not being caused by tire sizes or tire pressures, then the TPMS should be scanned to check for fault codes. There could be several other reasons why the light could keep coming on (bad wheel sensor, communications faults, internal TPMS module failure, etc.)

Sep 23, 2011 | 2001 Chevrolet Impala

### I bought a 1992 civic it had 2 different size tires in the front. There is a loud humming noise from the tranny it is a stick. Is this what caused it and how do i fix it?

Running 2 tire sizes on the front could/would damage the transmissions differential, depends on how long it was driven like that. It would require a trip to a tranny shop to fix it. But usually a loud humming noise comes from front wheel bearings going bad. On that car, the wheel bearing is pressed into the Hub, so if it is a bad bearing, it is still a trip to a shop for repair. Sorry I dont have any good news for you.

Nov 22, 2010 | 1992 Honda Civic

### 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

Jan 24, 2009 | 1995 Land Rover Range Rover

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