Tire size re calibration
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Senior User
Joined: Jun 2006
Posts: 125
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From: Battle Mountain NV
Tire size re calibration
Was wondering if the newer OBDII scanners or the CTS Devices can be used to recalibrate the speedo for different size tire's.
Do not have either device, yet, but spring will be getting new tires, I have a set of winter tires that are the stock size but want to get larger tires for summer. Going to dealer every spring n fall to adjust speedo will be a pain.
Thx
Do not have either device, yet, but spring will be getting new tires, I have a set of winter tires that are the stock size but want to get larger tires for summer. Going to dealer every spring n fall to adjust speedo will be a pain.
Thx
Lead Driver
Joined: Sep 2003
Posts: 5,844
Likes: 6
From: Albuquerque
I've heard that dealers are NOT changing rpm (rotations per mile) on different tire size. Only if you have a COOL dealer...but might be out of luck.
I have not seen a scan tool...going to make any changes to PCM.
biz
I have not seen a scan tool...going to make any changes to PCM.
biz
Senior User
Joined: Dec 2008
Posts: 163
Likes: 0
I've been wondering the same thing too... One thing i've noticed on my current truck is if i GPS my truck the speedo on the dash reads about 5mph fast. So if i were to go to a slightly bigger tire i could probly get away with not recalibrating it.
Senior User
Joined: May 2011
Posts: 167
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From: Manassas, VA
This is odd. I should be able to get my speedometer calibrated as a general safety item. This is a standard practice after receiving a speeding ticket. While they may not do it for free, I can't understand why I can't just take it to a dyno and get it calibrated.
Senior User
Joined: Jul 2011
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I had mine done by my dealer.....but.....there are only a predetermined set of tire sizes avalible in the computer that can be chosen from and those only work with what gear ratio is installed in the truck. We picked the best size tire that worked diameter wise but the truck kept throwing the CEL because the size was outside of the allowed parameters for my truck......if we changed the ratio then it would have changed most everything from engine management to transmission shift points. We ended up picking the tallest tire "allowed" for my gear ratio and left it at that.
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Senior User
Joined: Dec 2008
Posts: 163
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Sounds like one should give their their local dealer a call and see what their willing/able to do... I would think if your going to a slightly bigger tire over stock they probly would help you out...
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johnny4136
Explorer, Sport Trac, Mountaineer & Aviator
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Oct 4, 2009 05:52 PM
2011, 2012, 35, 350, calibrate, calibration, changing, f350, ford, recalibrate, recalibration, size, speedometer, tire, tires
