spare tire
Tuned
Joined: Feb 2015
Posts: 323
Likes: 12
From: Tulare, CA
Most likely the truck originally came with 18" rims & a Previous Owner installed the 20" rims and neglected to get a 20" RIM & tire for a spare. I upgraded my original 17" rims to 2014 20" Platinum rims and have yet to find a single 20" rim for sale so I have a correct spare
Super Moderator
Joined: Dec 2011
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All that matters is the outside diameter.
By varying the aspect ratio, a mounted 18" tire and wheel assembly can have the same diameter as the fancy looking 20" tire and wheel combinations having lower profile tires.
By varying the aspect ratio, a mounted 18" tire and wheel assembly can have the same diameter as the fancy looking 20" tire and wheel combinations having lower profile tires.
Logistics Pro
Joined: Jan 2010
Posts: 4,153
Likes: 1,659
So when you get a flat and put the spare on, you have a reminder to get that flat repaired.
Almost all vehicles have a steel-rimmed spare tire, and those generally aren't made in larger sized rims (generally).
You also must remember that, as stated above, by varying the aspect ratio you can get pretty close to the same OD regardless of rim size.
There won't be any fitment issues, either. Your spare is generally the smallest size that can fit over your braking system without rubbing, regardless of what wheels are actually on the truck.
Almost all vehicles have a steel-rimmed spare tire, and those generally aren't made in larger sized rims (generally).
You also must remember that, as stated above, by varying the aspect ratio you can get pretty close to the same OD regardless of rim size.
There won't be any fitment issues, either. Your spare is generally the smallest size that can fit over your braking system without rubbing, regardless of what wheels are actually on the truck.
Laughing Gas
Joined: Nov 2010
Posts: 800
Likes: 264
Most likely the truck originally came with 18" rims & a Previous Owner installed the 20" rims and neglected to get a 20" RIM & tire for a spare. I upgraded my original 17" rims to 2014 20" Platinum rims and have yet to find a single 20" rim for sale so I have a correct spare
I had a 2011 lariat and still own a 2013 lariat that came with 20" chrome clad wheels and both had/have an 18" steel spare with 275/70 tires. Both were purchased new, both had the 20" wheels on the window sticker. It's a money saving feature as mentioned previously.
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New User
Joined: Sep 2021
Posts: 3
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Thanks all, tire diameter of the 18is 33.2 and the 20 is 34.1 less than a inch all good thanks
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