What is the largest spare tire size that can be mounted with a 17" OEM wheel?

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My#3

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What is the largest size tire that can be mounted with a 17" OEM wheel (on a 2007 with OEM mount and bumper) that will clear the bumper?
 
Depending on your rig, you will run out of space in the wheel wells long before you have to worry about the spare. Especially if you are sticking with stock wheels, which don't have the back spacing for much beyond what the jeep comes with.

More information on your plans please.
 
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Stock wheels with LT285/70R17 121/118R, load range C, BFG KO2 will rub the front sway bar on lock to lock turns on our 2012 with no lift. The back bumper is from AEV with tire carrier so spare size is no concern. Our 2007 with no lift has the stock rear bumper. We know the LT285/70R17 is too large for the 2007 stock bumper and stock spare tire mount. Does anyone know the largest tire size that will mount on the 2007 and clear the bumper?
 
So you shared a bunch of info, and from what I could gather the 285/70/r17s with stock wheels fit on your 2012 just fine? Are you using wheel spacers? I tried that once, and my stock wheels with that size couldn't even be mounted on the jeep, they impacted the frame.
So you have tried to put one of the tires from the 12 onto the 07's spare tire mount right? and it didn't fit. I'm making sure that you actually tried and this isn't just somebody telling you that because I've worked in customer service. Have you tried mounting these on the Jeep itself?

I'm asking these questions because your description doesn't fit with the problems I've had, so I'm trying to parse out why.

Mine is four door by the way, that may make a difference.
 
I have 285/70R17 on stock wheels and it clears my bumper just fine. On the hubs I have 1.25” spacers with no rubbing. 2009
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Thanks, I read these very carefully. Please advise if I missed something. found a deal on 5 , 265/70r17, Falken AT3W for $179 mounted & lifetime balance/rotate. Scheduled install Friday after Thanksgiving. Should have no clearance/rub AND clear rear bumper. Any comments welcome.
 
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You should be good to go. At the very least you may have to shim your steering stops because of slight rubbing during tight turns.
 
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