17"or 18" replace 20"
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Senior User
Joined: Feb 2002
Posts: 402
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From: Two Harbors, MN
17"or 18" replace 20"
Have a 2008 F-350 crew cab 4x4 lariat with 20" wheels on it. Tire size is very limited/expensive. Can I replace the 20" wheels with 18" or 17"? I was told it depends on the size of the brakes. How do I check that, short of buying "test" wheels?
Im old school and would rather have more tire and less rim, than the other way around.
thanks for any help
Im old school and would rather have more tire and less rim, than the other way around.
thanks for any help
Tuned
Joined: Mar 2013
Posts: 418
Likes: 4
17" rim is the smallest you can go. If it was an 04 or older you could get 16, but 2005-current even has 17 from the factory on some models and all srw trucks have the same size rotors and calipers during each production year
Cargo Master
Joined: Jan 2015
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From: Boise
I ran aftermarket 17's on my 2016. I sure didn't like my clearance between caliper and rim. It was just too close for me. My recommendation is definitely 18's, plus the size 295/70/18 is a great size for those looking for a little more tire with high load ratings.
Thread Starter
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Senior User
Joined: Feb 2002
Posts: 402
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From: Two Harbors, MN
Perfect...thanks everyone. I truly dislike (Ive been told hate is too strong of a word) painted wheels and huge wheels with low profile tires..but like I said, Im old school. Again, thanks for the advice, I will go 18" wheels and keep the 20" for winter driving.
Lead Driver
Joined: Oct 2010
Posts: 5,420
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From: Ouray, CO
The sidewalls vary on the standard-size tires with 17/18 vs. the 20 inch, so the actual circumference isn't that far apart. Plus, with the "standard" 5% deviation anyway in the speedometer it's probably not going to make much difference.
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Cargo Master
Joined: Jan 2015
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From: Boise
275/65/20 revs per mile: 610
The difference is 2.8%. So you could be going 2.8% slower than the speedo and traveling 2.8% less miles than the odometer shows.
New User
Joined: Jan 2017
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Good info, thanks for sharing.
Senior User
Joined: Apr 2011
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From: Southern Oregon
My 20" tires on my Ford are rated at 3750lbs per tire.
Fleet Mechanic
Joined: Jul 2003
Posts: 1,815
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From: Houston
I'm not sure why people keep saying 20" wheels have no carrying capacity and extremely limited tire choices.
A quick search on tirerack.com gives me these results when searching for tires for a 2012 F250 4x4.
275/65/20 - 28 tire choices
275/65/18 - 32 tire choices
275/70/18 - 38 tire choices
If 28 tire choices doesn't get it done for you within the factory size I don't know what to tell you. This doesn't even include all the popular upsizes available for 20 inch wheels.
The carrying capacity of the stock 275/65/20 Michelin LTX AT2s that came on my truck is 3750lbs per tire. That is the highest rated carrying capacity out of all of the tire sizes Michelin makes for the LTX AT2.
Tire choices used to be hard to come by for 20 inch wheels, but it just isn't the case anymore. It seems like half the trucks and SUVs out there now have 20 inch wheel options that have allowed tire manufacturers to give us more choices.