Speedo Re-calibration
Post Fiend
Joined: Aug 2010
Posts: 13,710
Likes: 5
From: Manchester, CT
do you have a smartphone or gps? if smartphone, search "gps" in your app store and find one, or just use the speedometer on your gps. speedometers have been known to be incorrect even with factory tires, but now with 285s it is dead on in my truck
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
PM sent. I want to know that everything is reading true...it's a peace of mind thing. Also I have read it will adjust shift points etc. to the tires size. The truck does seem to downshift a bit more, but I have only driven it twice with the new tires...ya know blizzard and all
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Senior User
Joined: Dec 2010
Posts: 411
Likes: 0
It will downshift more and feel like it has a little less 'guts'. The tires are a little taller, bit they are also wider and heavier. All of this contributes to how/when it shifts. Not a significant change, but it's there. You get used to it real quick and it is a small price to pay to get away from those puny, undersized-looking 265's ford stuck on there. They must have done that in an attempt to eek a little more MPG out of the gassers.
Thanks for all the input. I have to try the GPS after Nemo.
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Senior User
Joined: Dec 2010
Posts: 411
Likes: 0
Miles, I downloaded a speedometer for android and ran the truck on the freeway, I'm running 2 MPH faster than the truck's speedo says...
Fleet Mechanic
Joined: Aug 2010
Posts: 1,458
Likes: 156
From: Sedalia, CO
So are tires. I had load range D BFG 285s, and my speedo was perfect. With the Es it read slow. AE fixed it easily.
Mark
Mark
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Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
If you have access to a marked stretch of highway, pull over and reset your tripometer and a mile marker - drive a few miles and stop at a MM. This will not be 'spot-on', but will at least give you another number to look at.
Something to consider - 2mph is not much at 70mph. Your tires likely have close to 1" of tread diameter, so chances are the 2mph will be compensated for over the life of the tires as the tread wears down...
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