How to recalibrate speedometer for bigger tires?

[MKE_Mike]

What are people using to adjust their speedometers when they go to a bigger tire?

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[V1Rotate]

Mine actually got closer to accurate going slightly larger.. it was about 2-2.5 mph off (fast) at 60 prior

 

[Felix808]

FORSCAN, or there is a more expensive tool out there for the less computer savvy.

 

[R1Bronco]

I used Superchips Flashcal.Easier to use and cheaper....Turned off double honk and start stop also...Does others things too...

 

[TallDude]

+1 for the Flashcal.
Got it off Amazon (https://a.co/d/6iUgWuE).
Recalibrated for some 35's on my BD (up from the stock size, ~31.8's) and it’s accurate within 1 mph.

Also disabled the double honk, start-stop and set TPMS warning light to whatever pressure I want.

 

[MKE_Mike]

I just ordered the Flashcal. Thanks guys

 

[Freedom5]

37s on my sasquatch fixed mine. Was 3mph fast and now spot on.

 

[Esmeral]

I used flashcal to resize tires after installing a set of Sasquatch takeoffs on my non-sas BD. With the original setting (32"), my speedometer showed less speed than actual, like 3 mph less than the gps at 60mph. I set 34.5" (closest to 315/70/17) and now the speedometer shows 4 mph above the gps. The closest match is setting 33" in the device. Why could be that?

 

[EJP-OB]

@R1Bronco
How is the $200 flashcal cheaper than a forscan cable, $50, and a 1 year subscription, $12?
Heck, there's even a free trial version of forscan.
Unless you don't have a laptop, otherwise it's much cheaper and not hard to use at all. There are countless forscan threads with all the info needed.

 

[Lcubed]

there's always the option of using the ford performance tune which includes tire size change as one of the minor capabilities

 

[R1Bronco]

@R1Bronco
How is the $200 flashcal cheaper than a forscan cable, $50, and a 1 year subscription, $12?
Heck, there's even a free trial version of forscan.
Unless you don't have a laptop, otherwise it's much cheaper and not hard to use at all. There are countless forscan threads with all the info needed.

I thought the year subscription was higher than that,but of course if you don't have a laptop then flashcal...
To me the flashcal was so much easier and straight forward ,plus my buddies were able to use it too,not sure if forescan let's you share....
If your good with computers, forscan....if not flashcal...

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