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Old Jan 10, 2008 | 09:46 PM
  #1  
orionife's Avatar
orionife
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Speedometer

How do I adjust my speedometer to read acurately with 35 inch tire on my truck, I am sure it is not far off but would like it to right on.
 
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Old Jan 10, 2008 | 10:09 PM
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Take it to your dealer they can reprogram down to 600 rev's per mile, so you will need to know that info. about your 35's.
 
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Old Jan 10, 2008 | 10:19 PM
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Ok two question, I am sure it is as simple as knowing the diameter and how many times it turns in a mile but is there a simpler way to figure it out? 35x12.5 with 18" rims. My second question is since I see you here alot and you help with this site, why can't I post info about my truck like pics and info you guys have?
 
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Old Jan 10, 2008 | 10:34 PM
  #4  
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Originally Posted by orionife
why can't I post info about my truck like pics and info you guys have?
You'll have to just make a few more posts/replies that's all. I don't know how many exactly but it took me a couple days.
 
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Old Jan 10, 2008 | 10:40 PM
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I think it's stated at 25 posts or so, just keep checking your "USER CP", for posting pics you can use photobucket and link to in your post, or you can become a supporter and post directly. For the tire ? Go to the mfr's website and you should be able to get the revs/mile info. Here's an example of what to look for:
 
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Last edited by rotun; Jan 10, 2008 at 10:44 PM.
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Old Jan 10, 2008 | 10:49 PM
  #6  
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thanks for the info on both, How do you become a sponsor
 
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Old Jan 10, 2008 | 11:03 PM
  #7  
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in "user cp" go to the bottom left and click on paid subscriptions, or just click on the "supporter" flag next to my name. I paid for a 3 year as the money it cost has already been saved by means of the time I have saved from help and info. available on this site.
 
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Old Jan 10, 2008 | 11:06 PM
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Tad less than 600 RPM running a tire with true 35" diameter.... 596.50 is the number I come up with.....
 
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Old Jan 10, 2008 | 11:17 PM
  #9  
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Thanks for the info on all of it Rotun, as you can see I followed your advice. also thanks for the tire info wrangler
 
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Old Jan 10, 2008 | 11:32 PM
  #10  
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Originally Posted by orionife
I am sure it is as simple as knowing the diameter and how many times it turns in a mile but is there a simpler way to figure it out
Tire RPM = 20,178/diameter or 63360/circumference

FYI a 35x12.5R18 is not necessarily 35-inches in diameter.
 
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