How can I tell when I need new tires? - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 18 (permalink) Old 08-13-2008, 09:56 PM Thread Starter
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How can I tell when I need new tires?

I have a commander(specs in signature). I have the stock original Goodyear Forteras with 41,000 miles. They are not bald, but I also don't want to get too close. What's the best way to tell when to get new tires. I'm used to having mustangs with low profile and had to change a lot more often.
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post #2 of 18 (permalink) Old 08-13-2008, 11:04 PM
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Do the Lincoln Penny test, insert the penny into your tread with Lincoln's head upside down. If any part of the head does not disappear into your tread then your tires need replacing. Your tire should also have wear bars that you can look for, if you find the bars then the tread is too short.





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post #3 of 18 (permalink) Old 08-14-2008, 08:54 AM
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Recently, they've scrapped the penny technique, and started using the quarter instead. Same method as the penny trick that a49er mentioned, but use a quarter instead. That's a good judge as to if you need tires.


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for pics and information
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post #4 of 18 (permalink) Old 08-14-2008, 09:31 AM
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That would make sence as the quarter is taller and so are the current treads. Thanks for the updated info sciron4x4.





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2006 XK, Steel Armadillo Front Bumper w/Warn Powermate winch, Rear Bumper w/tire carrier & Super Sliders, Rhino Rack Roof Rack and Foxwing Awning, KC Lights on Steel Armadillo Light Bar, 4xGuard Rear Differential Cover, Steel Armadillo Plates.
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post #5 of 18 (permalink) Old 08-14-2008, 10:06 AM
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If you look at the side wall and you see the word "Fortera" then you probably need new tires.

I say that only because they are not good offroad tires. I don't know if that is your intention or not, but I have lost faith in Goodyear tires.

The quarter test as mentioned is a good test to determin tread life however.


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post #6 of 18 (permalink) Old 08-14-2008, 12:33 PM
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i agree with the statement above! very funny. those stupid tires got me stuck so many times.

all hail

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post #7 of 18 (permalink) Old 08-14-2008, 01:01 PM
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Hey, the Goodyear Silent Armors are good tires, so not all Goodyears are worthless. If you're just using the Fortera's for regular road and light snow, it's a good tire. Each tire has it's own purpose.

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post #8 of 18 (permalink) Old 08-14-2008, 02:09 PM
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The penny test is based upon 2/32", which is pretty much the minimum tread depth according to the law. Here in NY, you need that much tread to pass the state inspection.

I believe the quarter test is based upon having 4/32" of tread remaining. Personally, that would be my minimum depth, just for driving on the street in the summer. If I wanted to drive on a trail or drive in foul weather (or snow) I would definitely want more than 4/32" of tread remaining.
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post #9 of 18 (permalink) Old 08-14-2008, 07:34 PM
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Can the coins and get a real tread depth gauge. They are inexpensive and not subject to stamping varience.[coins]

Rule of thumb, all tires, cars,trucks,motorcycles, 3/32 is minimum safe depth. Beyond that, the tire will hydroplane. It no longer has the capability to sipe water from tread center to outside.

Now look gang, no manufacturer sells a car with crummy tires.
However, often the tires do not meet our designated needs.

The Fortera's are very good general road tires. They are quiet, sipe water well, and cut snow to pavement with relative ease. They wear well if rotated, correctly inflated, and the vehicle is kept in alignment.

If I was to use [try to use] the tires that 4.7 has in our snow storms it would be a disaster.
They are too wide and would end up going into flotation. Not so good on snow, but great on loose terrain.

Same goes for Fohn Jargo. His photo has his Jeep on sand. If its loose sand a wider high flotation tire is required.

The Forteras would sink to the control arms in that situation.

Now JEEP boi has attained 41k miles. In Florida they use that evil aggregate to pave roads. The stuff is like driving on sandpaper, so if he has achieved 41k he definatly stays on top of his tire maintenence. In his case it sounds as though the Fortera's might have been the right tire and if it was me, I'd put the same thing back on for another 41k or more miles.

Yep, there I go again........my $.02 Rob


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post #10 of 18 (permalink) Old 08-14-2008, 09:36 PM
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I agree that the forterra's are good tires but as a general rule of thumb I say if your tires are stock size then you probably need new ones (BIG ONES!).

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