Spare tire
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New User
Joined: Jul 2012
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Spare tire
I have a 2012 STX with 18" rims. The other day I dropped the spare and realized that the spare is on a 17" rim but that the tire is actually about an 1 1/2" taller than the tires on the truck. The dealer is saying that this is normal. Has anyone else found this? I worry that it could cause damage if I ever had to use it. 
Thanks,
Janet
Thanks,
Janet
Cargo Master
Joined: Jul 2003
Posts: 3,358
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I know when Ford first started offering the 18" wheels they sent a few trucks out with 17" spares by accident and the trucks with 20" wheels have an 18" spare, but overall diameter on the tires was the same. I think something isn't right with your setup.
Super Moderator
Joined: Jan 2008
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From: Maine, Virginia
There could have been a mix up. However, if you have an open differential then it's not going to hurt anything anyway. Besides, the spare should never be used longer than is needed to repair / replace the tire in question, then promptly re stowed for the next event of bad luck.
Cargo Master
Joined: Sep 2007
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Too funny. I need to check my spare. I haven't done it in a very long time and now I'm curious because I just can't remember.
Moderator
Joined: Jul 2011
Posts: 6,513
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From: Sioux Falls Area
if you don't mind, post up the sizes of the spare and your regular tires. i'm kinda curious what odd size 17 made it's way under your truck that is bigger than your 18's. generally they are all about the same overall size, regardless of rim diamater.
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Joined: Jan 2008
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From: Maine, Virginia
The 265 / 17 is the optional 17" tire on the F-150's. I have t he 235's on mine and I will be increasing tot he 265's next go round. The 265's are also the standard 17" on the Expeditions. It's a great size tire as it is plentiful by all makers and not too expensive for what you get.
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Cargo Master
Joined: Apr 2007
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Given those tire sizes, the 17" tire is about an inch larger diameter than the 18 inch. Those little stinkers shouldn't be mixing tire sizes like that. Unlike a car, a truck has a full size spare for good reasons, and the spare tire should match the other tires.
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