Speedo Calibration For Larger Tire Size?

[SpaceWhiteF150]

For those of you with larger tires are any of y’all’s speedos recalibrated?

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[UGADawg96]

I went from 275/60r20 to LT285/60r20 and didn't need to recalibrate. GPS showed the OEM tires had the speedo off. The speedo now matches GPS.

 

[VbPb]

I went from factory 32” tires to 34.5” tires. Initially the speedo was off; but, the truck seems to have adapted to the taller tires. I verified the speedometer reading with an AIM Solo 2 and local “your speed” radar traffic signs.

Cheers,

 

[pavementends]

I went from factory 32” tires to 34.5” tires. Initially the speedo was off; but, the truck seems to have adapted to the taller tires. I verified the speedometer reading with an AIM Solo 2 and local “your speed” radar traffic signs.

Cheers,

Wow, this is a thing?? Awesome

 

[ocwill1]

went from 32 to 34, used forscan to change. dead on now, was not before.

 

[BigGuy2851]

went from 32 to 34, used forscan to change. dead on now, was not before.

Hello can u walk me threw the steps to redo my speedo? Im putting on 285/65/20 this weekend.
Thank you

 

[ocwill1]

Hello can u walk me threw the steps to redo my speedo? Im putting on 285/65/20 this weekend.
Thank you

If you have forscan, there is a spreadsheet for doing forscan changes on the other site, f150 forum dot com... I can send you the exact link in dm if you want me to.. you can download a spreadsheet that someone made to input your tire size, and it will tell you what forscan changes to make.

 

[BigGuy2851]

If you have forscan, there is a spreadsheet for doing forscan changes on the other site, f150 forum dot com... I can send you the exact link in dm if you want me to.. you can download a spreadsheet that someone made to input your tire size, and it will tell you what forscan changes to make.

Please send me link.

Thank you
George

 

[wolfnards]

Please send me link.

Thank you
George

would love the link as well!

 

[Cranbery]

Please PM me link as well.

I was reading that this forscan fix does not work on a 21+, can anyone confirm?

 

[SpaceWhiteF150]

My Speedo was off from the factory, with the new tires my Speedo was exactly on!

 

[ocwill1]

https://www.f150forum.com/f129/forscan-14th-gen-f150s-481816/

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