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Old 05-02-2014, 03:56 PM   #1
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Meansure Tire Size

Hi All,

need your help , i have installed Mickey Thompson Tires ATZ PS3 size 315/70 R17 .. 35 tire size. i've programmed tire size 35 , but felt like the speedometer not giving me accurate speed . then i done the measurement it gave 33 and inches above , so reprogrammed the tire size to 33.85 still felling it is not accurate ..

Can anyone guide me and help me if he/she faced the same issue and what is a correct size should program it.

Thanks in Advance

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Old 05-02-2014, 05:20 PM   #2
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Hers your math as I have understand it
315devide24.5=12.857X.70=9X2=18+17=35
As I have understood from another post here this math figures out height in inches from metric tire sizes
I did the math on my stock sport s tires than measured it worked out for stock sport s sizes hope this makes sense and helps ya

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Old 05-02-2014, 05:39 PM   #3
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NOT! find the revs per mile for the tire then divide into 63,360 inches/mile. Then divide result by 3.14 to determine tire diameter. That is the real height of the tire.
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Old 05-02-2014, 06:04 PM   #4
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for the sake of programming park on a flat cement surface at whatever psi you are going to run. Measure from center of hub to the ground and X2 and that is what you need to program for tire size. I have done it that way several times and so have friends and it always is spot on both speed and odometer when compared to stand alone gps'
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Old 05-02-2014, 06:07 PM   #5
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What module are you using to reprogram your speedo?
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Old 05-03-2014, 12:59 AM   #6
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am using Bully dog tuner?
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Old 05-03-2014, 04:14 AM   #7
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Hello All,

Is this link useful and accurate

http://www.onlineconversion.com/tire...conversion.htm

Thanks
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Old 05-03-2014, 07:50 AM   #8
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Quote:
Originally Posted by Rubi1414 View Post
Hello All,

Is this link useful and accurate

OnlineConversion.com - Tire Size Conversion

Thanks
yes and no. it tells you the theoretical size for your programmer you need to measure the actual distance from the ground to the center of the hub and X's that by 2. I know seems too simple so nobody wants to take the simple approach
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Old 05-03-2014, 08:02 AM   #9
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as you say it does not "feel" right.. get a GPS and verify the true speed... simple and easy.. can even download a gps app for your phone, then you will know how far your off..
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Old 05-03-2014, 01:54 PM   #10
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Will test it using my GPS , will update you all.

Thanks

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