Different SIZE Spare
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Fleet Mechanic
Joined: Jan 2005
Posts: 1,784
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From: Tomball, Tx
Different SIZE Spare
IS ANYONE ELSE SEEING THIS??
our Platinum 350 (SRW) long bed crew cab has a different size SPARE TIRE...
the 4 Michelins are 275/65 R20's and the spare is a 275/70R18
the spare is a Goodyear Wrangler (which doesnt matter to me) but the 18 vs 20 does bother me...
our Platinum 350 (SRW) long bed crew cab has a different size SPARE TIRE...
the 4 Michelins are 275/65 R20's and the spare is a 275/70R18
the spare is a Goodyear Wrangler (which doesnt matter to me) but the 18 vs 20 does bother me...
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Fleet Mechanic
Joined: Jan 2005
Posts: 1,784
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From: Tomball, Tx
at best this means you can NOT rotate the spare as you rotate your tires (its a steel wheel anyway).
Tuned
Joined: Jul 2009
Posts: 393
Likes: 18
From: Irving
It matches the standard 18" wheel and tires for the 4x2 trucks. The revs per mile aren't much off, and it's meant to be temporary. Doesn't have a TMPS sensor, either. They don't intend you to rotate the spare anymore, it seems. :-)
Senior User
Joined: Jun 2017
Posts: 329
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I bought a Toyota Sequoia in '05 (still have it, great truck) and the first time the TPMS light came on I checked all the tires and they were within 2 PSI of normal. I called the dealership and the guy said "have you checked your spare?"....had no clue they monitored the spare. They could have pinched me for a new sensor and I would have never known....glad the guy was honest.
Logistics Pro
Joined: Aug 2006
Posts: 4,477
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From: Raceland, La.
Almost an inch shorter. Not the best idea with a limited slip rear...but with the E-lockers you can get by with it...almost like an open rear end except for the traction control you should be OK if turned off.
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Logistics Pro
Joined: Aug 2006
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From: Raceland, La.
Unless you want a 35" spare on the 18" wheel!! 
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Fleet Mechanic
Joined: Jan 2005
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From: Tomball, Tx
I'm glad Mopar is smarter than that....from the factory my Jeep Wrangler has a matching aluminum wheel/spare AND TPMS emitter in it...and yes it gets rotated.
Elder User
Joined: Jan 2004
Posts: 566
Likes: 3
From: Florence SC
Yep, it will wear out the LS pretty quickly. But as I understand, the DRW are the only ones with LS rear diffs, so this is not that much of an issue.
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Fleet Mechanic
Joined: Jan 2005
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From: Tomball, Tx
do DRW's get 18's (only)??
could be disastrous to run a smaller tire/wheel on a DRW.
Mountain Pass
Joined: Jan 2017
Posts: 122
Likes: 8
Just FYI, the location under the truck has plenty of room for a 275/65/20 tire, I got a 20" Ford King Ranch rim off ebay and mounted up a 275/65/20 for a full size matching spare. It also looks like there is room under there to go to a 285/65/20. The 295/65/20 may be pushing it.
Prolocutor
Joined: Jan 2009
Posts: 13,618
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From: Western MA
It's been this way for the last 3 generations of SD's. Nothing new here. Just Ford saving a few bucks. Back two generations ago when you could have LS instead of the elocker on an SRW with 20's, the owners manual used to tell you that if you got a flat in the rear, to put the spare on the front and put the good 20" from the front onto the rear.