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  #1  
Old 05-20-2015, 11:44 PM
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I'll start off by saying I have a 2011 Laredo 4x4 with a RRO leveling kit... I have 265/65/18 GY adventurers on right now and want to replace my donut with a full size spare. I have a 17 Laredo stock wheel but what tire size should I go with? I guess the diameter of the spare is all that matters? Would a 245/75/17 be my best bet and would that fit in my spare tire compartment? Have done some studying but haven't heard from anyone if the 245/75/17 would fit in the spare compartment. Any help?

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Old 05-21-2015, 09:40 AM
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Re: Spare tire help!

You want to match the diameter of your primary tires and the spare should have a similar load rating. It does not have to be as wide...the OEM full size spare is narrower than the OEM tires so that it fits under the cargo lid better.
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Old 05-21-2015, 12:27 PM
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Re: Spare tire help!

If you want to compare wheels and tires, I suggest you bookmark this page:

Custom rims, wheel tire packages for your ride - RIMSnTIRES.com

You can compare several specs, and it will inform you of the effect on your speedometer/revs per mile. It has real time visual changes to the specifications you input.
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Old 05-21-2015, 03:02 PM
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Re: Spare tire help!

Tire size calculator and tape measure
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Old 05-21-2015, 03:35 PM
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Re: Spare tire help!

Quote:
Originally Posted by tiri View Post
If you want to compare wheels and tires, I suggest you bookmark this page:

Custom rims, wheel tire packages for your ride - RIMSnTIRES.com

You can compare several specs, and it will inform you of the effect on your speedometer/revs per mile. It has real time visual changes to the specifications you input.
While that's an interesting tool, I'm not sure it's necessary for a spare. In theory, even if you actually use the spare, it's only going to be on there until you get the real tire repaired or replaced.

I'm not sure that's enough time to worry about anything other than the tire being the same diameter.
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Old 05-21-2015, 08:54 PM
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Quote:
Originally Posted by NetworkTV View Post
While that's an interesting tool, I'm not sure it's necessary for a spare. In theory, even if you actually use the spare, it's only going to be on there until you get the real tire repaired or replaced. I'm not sure that's enough time to worry about anything other than the tire being the same diameter.
Network: I got ate up on another thread for having the wrong sized spare to match the diameter of my 4 regular tires. My thoughts we exactly what you said but unfortunately that's not true. I did lots of research and came to the conclusion that YES you could screw up a AWD/4WD vehicle with any amount of miles driven with the wrong sized spare. Plenty of articles out there to read.

Thanks for the tire comparison tool link. I already know which size tire I want. Just need to know if it will fit in the spare compartment.
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Old 05-22-2015, 11:54 AM
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Re: Spare tire help!

Quote:
Originally Posted by rs153719 View Post
Network: I got ate up on another thread for having the wrong sized spare to match the diameter of my 4 regular tires. My thoughts we exactly what you said but unfortunately that's not true. I did lots of research and came to the conclusion that YES you could screw up a AWD/4WD vehicle with any amount of miles driven with the wrong sized spare. Plenty of articles out there to read.

Thanks for the tire comparison tool link. I already know which size tire I want. Just need to know if it will fit in the spare compartment.
I just wanted point out that if you re-read Network's last sentence, I think he was saying that you DO need to have the same diameter spare as the rest of the wheels, but that the width and sidewall height don't matter as long as the diameter is the same.
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Old 05-22-2015, 01:19 PM
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Re: Spare tire help!

Quote:
Originally Posted by JMessick82 View Post
I just wanted point out that if you re-read Network's last sentence, I think he was saying that you DO need to have the same diameter spare as the rest of the wheels, but that the width and sidewall height don't matter as long as the diameter is the same.
That's exactly what I was saying.

Even the "full size" spare you get with the off road package (or towing package - it comes with either) isn't the same width as the actual tires. One the size of off my on/off road tires wouldn't fit in the well.

However, as long as the diameter is the same, it should avoid any leveling or tire stress issues no matter what the size wall or wheel size is. I just wouldn't want to run with it any longer than necessary, considering even an identical tire would have a different amount of tread wear.

That's especially true if you never maintain the spare (proper air pressure and the like), then expect to drive on it after it's been in the trunk for 4 or 5 years. Pickups are even worse since the spare is usually under the bed, exposed to the elements. Just about as bad are the ones mounted outside on the back gate.

Spares are exactly that: spares. If they were replacements, they would call them that.

The key is, you it's not a compact spare. Donuts are for eating with coffee, not for running on trucks.
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