Tire Size/Odometer/Speedo Correction... - Page 2 - Nissan Titan Forum
Titan Wheels, Tires & Brakes Technical discussion about the wheels, tires, brakes, etc.

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post #16 of 49 (permalink) Old 02-02-2008, 07:10 PM
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Re: Tire Size/Odometer/Speedo Correction...

Do not use the radar systems you see on the side of the road to check your speed those things are never very accurate.

My 08 Titan shows @3mph faster on the speed than it is actually going on stock tires.

If you go to a larger tire size your speed-o will be off by a %. So if the tire you put on is 10% larger then you will always be going 10% faster than what your speed-o reads. SO at 10mph you are traveling 1mph faster than what your speed-o shows and at 100mph you are traveling 10mph faster than what it shows.

There is also @ +/-3mph margin of error for the factory speed-o. Same with most GPS systems.

One of the reasons that police usually do not bother people traveling 5-10mph over the speed limit is that the margin of error of all the equipment involved falls within this range. Laser however is said to be very accurate.
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post #17 of 49 (permalink) Old 05-02-2008, 08:34 AM
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Re: Tire Size/Odometer/Speedo Correction...

I purchased the Hypertech In-Line Speedometer Calibrator from RealTruck.com for $206.99 shipped. (Use the coupon code SJ921) This was on my 08. It offeres tire/wheel size correction and gear ration correction. It was a pain in the arse to install. I had pull out the instrument panel to get the plug it connects to, but it worked. The tires I put on were wider but an 1 1/2" shorter so I was putting more miles on my truck than I was actually driving. But this fixed it and everything is reading correct according to my GPS.
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post #18 of 49 (permalink) Old 05-02-2008, 08:57 AM
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Re: Tire Size/Odometer/Speedo Correction...

Handy dandy calculator for changing your tire sizes:

http://www.dakota-truck.net/tirecalc/tirecalc.html

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post #19 of 49 (permalink) Old 01-24-2009, 11:58 PM
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Re: Tire Size/Odometer/Speedo Correction...

i have found the best size calculator gives both the % and speed difference traveling at 60

Tire Size Calculator - tire & wheel plus sizing

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post #20 of 49 (permalink) Old 01-25-2009, 11:16 AM
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Re: Tire Size/Odometer/Speedo Correction...

Anybody have a solid answer as to what Tire the Titan is calibrated to OEM? I know the XE is slightly smaller than the SE/LE Tires. I think the XE was a 31.8" or 31.6" tire. My current 265/70/17 seems dead on with GPS.

My greatest need, is to reset my Cipher for 0-60 MPH when I go to the track again. I'll change it to a 0-68 MPH or whatever, to get accurate 0-60 MPH ET with my Drag Radials. They are much smaller Diameter, about 28"

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Last edited by TitanBlue; 01-25-2009 at 11:22 AM.
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post #21 of 49 (permalink) Old 01-25-2009, 11:49 AM
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Re: Tire Size/Odometer/Speedo Correction...

My 04 XE the speedo was set for the 265-70-18 (32.6" tall) stock tires were the 245-75-17 (31.5" tall) and the speedo was off by 3 mph. I got one of the Hypertech In-Line Speedometer Calibrator and set it for the 17's and the speedo was dead on.
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post #22 of 49 (permalink) Old 05-26-2009, 09:10 AM
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Re: Tire Size/Odometer/Speedo Correction...

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Originally Posted by TitanTech659 View Post
Also you can use the tire pressure sensors on some but not all aftermarket wheels. It depends on the hole that the valve stem goes in.

I have seen where someone strapped the senor to the inside of a wheel instead of the stem hole. You see any reason this wouldn't work universally for all wheels?

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post #23 of 49 (permalink) Old 07-13-2009, 09:43 PM
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Re: Tire Size/Odometer/Speedo Correction...

Hello everyone just purchased some 20" rims on 33" m/t toyo tires and my significant other says that she noticed an increase of speed down the highway today. IS HER FOOT HEAVY OR IS THIS NORMAL? 2004 se king cab 4x2
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post #24 of 49 (permalink) Old 12-11-2009, 12:39 AM
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Re: Tire Size/Odometer/Speedo Correction...

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Originally Posted by chuyb View Post
Hello everyone just purchased some 20" rims on 33" m/t toyo tires and my significant other says that she noticed an increase of speed down the highway today. IS HER FOOT HEAVY OR IS THIS NORMAL? 2004 se king cab 4x2
For the exact same RPM and gear combination you will be moving faster; you will be using more gas to do it. You did not gain 'speed' in the sense of how fast you can go, only perhaps in the speed you are actually moving when driving the same as before.
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post #25 of 49 (permalink) Old 04-13-2010, 08:32 PM
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Re: Tire Size/Odometer/Speedo Correction...

Here is a link to a simple calculator that can tell you what changing your tires will do to the speedo


Tire size calculator
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post #26 of 49 (permalink) Old 06-09-2010, 10:30 AM
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Re: Tire Size/Odometer/Speedo Correction...

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Originally Posted by Demondw3 View Post
With 35" tires your speed is of by 5mph. I have tested this theory with my GPS and Highway patrol. Highway turned out to be a more expensive test.
that depends on how fast you are going.

I actually calculated it the other day, again. My calculation was similar to the original post in this thread. Multiply by 1.09 to get the correct mileage or speed.

Last edited by Energizer; 06-09-2010 at 10:37 AM.
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post #27 of 49 (permalink) Old 06-09-2010, 10:41 AM
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Re: Tire Size/Odometer/Speedo Correction...

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Originally Posted by TitanTech659 View Post
It is not possible to recalibrate the speedo on the Titan.
They make these for the Titan. Not sure if it will work for pre-2007 models...

Speedometer Calibrator - Hypertech
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post #28 of 49 (permalink) Old 06-11-2010, 06:37 PM
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Re: Tire Size/Odometer/Speedo Correction...

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Originally Posted by Energizer View Post
They make these for the Titan. Not sure if it will work for pre-2007 models...

Speedometer Calibrator - Hypertech
There are 2 different part numbers, one for the 04-07 and another for the 08-Up Titans.
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post #29 of 49 (permalink) Old 06-11-2010, 07:34 PM
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Re: Tire Size/Odometer/Speedo Correction...

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Originally Posted by titanss View Post
There are 2 different part numbers, one for the 04-07 and another for the 08-Up Titans.
yeah, I got the part numbers... already looking to get one.
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post #30 of 49 (permalink) Old 06-16-2010, 11:02 AM
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Re: Tire Size/Odometer/Speedo Correction...

I read the product description and it says you can adjust tire size and gear ratios. Wonder if that would help save our cruise control after a gear swap???

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