what do you guys do for a spare tire? - Ford Powerstroke Diesel Forum
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Old 07-10-2010, 06:41 PM
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what do you guys do for a spare tire?

I just installed a set of mickey thompson 315/70/17 on my 2003 f250 crew cab 7.3L truck. My question is what does everyone do for a spare? Currently i have a 285/75/16 under the truck. Im assuming i could run this tire in an emergency to get me home or to a tire shop, if i put the small tire on the front. I know i deffinetly wouldnt want it in the rear. I know it would like horrible but if i didnt use 4x4 would it be causing any damage?

Also whats the largest tire i can fit on a 16in rim under the truck? Im wondering if i could squeeze a 315/75/16 under there how that would be as a spare, since it would be closer to the 17's than the current 285/75/16.

Thanks for any ideas or info
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Old 07-10-2010, 10:17 PM
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I took mine out, im not going to run anything on it if its not the same size, so whats the point of the extra weight.
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Old 07-11-2010, 04:00 PM
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you can fit a 35" in the stock location. Thats what i've done on all my trucks since my 99. If i was you i would just put a 315/70/17 on your spare rim and call it a day. Even on my 09 i keep a 35 in the stock location. And thats one of the main reasons i don't run anything bigger then a 35", I like a have a full size spare and not take up bed space

Edit: saw its a 16" for you spare. And a 315/75/16 fits the rim just fine and fits in the stock location even with a 4" exhaust. Thats what i used on my 99 and 01

Last edited by wired1; 07-11-2010 at 04:04 PM.
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Old 07-11-2010, 04:01 PM
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We all need a spare - for that one rare chance that one of our heavy duty tires do actually get a flat! I havent had a flat on my truck since I bought it almost 150,000 miles ago - but you never know.

As far as the height difference in the tires - the general rule of thumb is if you get a flat on the rear, put the spare on the front and move the front to the flat location in the rear.

Reason is with our unlockable front axles - it allows the front to spin at different rates and not screw anything up. Do this for a short distance only. Enough to get to a facility to get the tire hopefully plugged and back on or all together replaced if your so lucky.

Good luck.
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Old 07-11-2010, 04:07 PM
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on the front as long as you didn't lock the hubs or engage the 4 wheel drive you would be fine . Even on the rear end to get a few miles would be ok , kinda like the mini spares some cars come with . That being said I wouldn't go far . You would risk messing up the clutches if your truck has a posi (limited slip) rear end . If you have an open rear end it would be fine .
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Old 07-11-2010, 04:39 PM
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i have a full size spare.
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Old 07-12-2010, 12:10 AM
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I have a full size 38 in spare. I had a mount built in the bed. My truck is pretty much as worthless as $%^% on a boar anyway as far as towing and what not so i don't care about bed space. It's my toy. I only put it in on long distances. Have not had to use it so far.
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Old 07-12-2010, 01:43 AM
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How did you guys get a 35" under there? I have tried and it ain't even close? My 4" exhaust is right up against my shock too? Hits it in fact. I still have my factory spare.
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Old 07-12-2010, 10:23 AM
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haha, how about a few cans of fix a flat?
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