Author Topic: Ford F-150 - question about upgrading wheels from 17" to 20"  (Read 1224 times)

0 Members and 1 Guest are viewing this topic.

Offline DLR Pyro

  • Hero Member
  • *****
  • Posts: 5748
  • Reputation: +881/-21
Ford F-150 - question about upgrading wheels from 17" to 20"
« on: March 10, 2015, 04:25:54 PM »
Last month I bought a new Ford F-150 truck.  It came with 17" wheels but because Ford enlarged the wheelwells for the truck bed, the 17" wheels look puny and out of place.  I didn't give it much thought but my wife said it looks funny.  I have found several ads listing stock Ford 20" wheels on craigslist (usually brand new and from people who are upgrading to custom wheels). 

My question is do I need to get a new speedometer gear or have the dealer do anything to the computer module to compensate for the larger wheel diameter the 20" will give me?
Trump Won.  Get over it!

Basking in the glow of my white privilege


Police lives matter.

Offline Chris_

  • Little Lebowski Urban Achiever
  • Hero Member
  • *****
  • Posts: 46845
  • Reputation: +2028/-266
Re: Ford F-150 - question about upgrading wheels from 17" to 20"
« Reply #1 on: March 10, 2015, 04:41:16 PM »
If you're able to retain the same diameter with the new wheels and tires, you shouldn't need to make any changes.  Anything else, and I'd be asking the dealer if you're working with them.
If you want to worship an orange pile of garbage with a reckless disregard for everything, get on down to Arbys & try our loaded curly fries.

Offline Big Dog

  • ^^Smokes cigars and knows things.
  • Hero Member
  • *****
  • Posts: 15511
  • Reputation: +1946/-213
Re: Ford F-150 - question about upgrading wheels from 17" to 20"
« Reply #2 on: March 10, 2015, 04:48:29 PM »
Last month I bought a new Ford F-150 truck.  It came with 17" wheels but because Ford enlarged the wheelwells for the truck bed, the 17" wheels look puny and out of place.  I didn't give it much thought but my wife said it looks funny.  I have found several ads listing stock Ford 20" wheels on craigslist (usually brand new and from people who are upgrading to custom wheels). 

My question is do I need to get a new speedometer gear or have the dealer do anything to the computer module to compensate for the larger wheel diameter the 20" will give me?

One percenter! Occupy DLR Pyro's driveway!
Government is the negation of liberty.
  -Ludwig von Mises

CAVE FVROREM PATIENTIS.

Offline JohnnyReb

  • In Memoriam
  • Hero Member
  • *****
  • Posts: 32063
  • Reputation: +1995/-134
Re: Ford F-150 - question about upgrading wheels from 17" to 20"
« Reply #3 on: March 10, 2015, 05:53:01 PM »
Damn computers make changing wheel and tire sizes a nightmare now days. Ask some trust worthy person.....like a hot rodder.
“The American people will never knowingly adopt socialism. But, under the name of ‘liberalism’, they will adopt every fragment of the socialist program, until one day America will be a socialist nation, without knowing how it happened.” - Norman Thomas, U.S. Socialist Party presidential candidate 1940, 1944 and 1948

"America is like a healthy body and its resistance is threefold: its patriotism, its morality, and its spiritual life. If we can undermine these three areas, America will collapse from within."  Stalin

Offline ExGeeEye

  • We don't need another
  • Hero Member
  • *****
  • Posts: 1382
  • Reputation: +184/-102
  • Spread the work ethic; the wealth will follow.
Re: Ford F-150 - question about upgrading wheels from 17" to 20"
« Reply #4 on: March 10, 2015, 06:19:59 PM »
If you consider that an "upgrade"...
My CCW permit was issued in 1791.

Charter Member of the Vast Right-Wing Conspiracy
Associate Member of the Basket of Deplorables

Offline Bad Dog

  • Hero Member
  • *****
  • Posts: 5917
  • Reputation: +309/-313
  • God help me I do love it so
Re: Ford F-150 - question about upgrading wheels from 17" to 20"
« Reply #5 on: March 10, 2015, 06:26:11 PM »
If you're able to retain the same diameter with the new wheels and tires, you shouldn't need to make any changes.  Anything else, and I'd be asking the dealer if you're working with them.

Chris is right but, I seriously doubt you could get tires for 20" rims that would be the same diameter as those on the 17" rims.  You should be able to simply switch out the little gear in the transmission that drives the signal generator for both the computer and the spedo.  You might search Ford truck forums for the formula to determine the proper gear or a dealer service rep. might be able to help you.  I went through the same thing on my car when I changed both tire diameter and my ring and pinion set.