PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

16" to 17"?

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Old May 11, 2006 | 04:54 AM
  #1  
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Default 16" to 17"?

just changed to the 17" ss rims, just wondering if i need to change anything in my comp?

thanks
josh
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Old May 11, 2006 | 05:14 AM
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as long as the overall height remains the same you dont (ie 275/40/17).
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Old May 11, 2006 | 06:48 AM
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^^^ what he said

in order to say for sure if anything needs to be changed... need your old tire height and new tire height (example... 275/40/17 ... wheel diameter is 17, sidewall radius is 1/2 wheel diameter + 275/25.4 * .40 (*40 is aspect ratio, it's a percentage of sidewall height compared to tire width... which is what the 275 value is... in mm)

so 275/25.4*.40*2 + 17 = new tire height (replace values w/your tire specs)

so long as new is close to old, no changes needed
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Old May 11, 2006 | 08:32 PM
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245/50/16 to 275/40/17 ill be honest the equation confused me a little bit. i got 23 for the 16 and 25 for the 17???? can someone check this...

thanks
josh
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Old May 11, 2006 | 08:56 PM
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its ~.1 of an inch off...so its up to you if you want to have your speedo adjusted...it probably wont make more then a mph or so difference at 50mph.
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Old May 11, 2006 | 09:24 PM
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If you don't change your computer, your car may not start!!


J/K. You should be fine.
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Old May 11, 2006 | 11:06 PM
  #7  
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LOL, wont start huh!?! you wouldnt believe what the guy at monroe muffler was telling me about changing tire sizes. first the 275/40/17, in his opinion, only belong on SUV's, he couldnt figure out why i was putting them on a camaro. second, he told me to take off the 17" and put back on the 16", cause 17" aren't stock for it, it just wont run right. and finally with 16" tires he could save me a hundred bucks. a 100 bucks, whopidity doo! i had a hard time restraining myself from slappin the stupidity out of him!! well, i got a laugh out of it anyways.

thanks for the help!
josh
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Old May 12, 2006 | 02:51 AM
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Tire diameters:

245/50/R16 => 245 * 0.50 * 2 / 25.4 + 16 = 25.65"
275/40/R17 => 275 * 0.40 * 2 / 25.4 + 17 = 25.66"
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Old May 12, 2006 | 10:34 AM
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http://www.discounttiredirect.com/di...foTireMath.jsp

Will knock your speedo off by 3/100 at 65MPH.

Last edited by Purrvert; May 12, 2006 at 10:39 AM. Reason: sp
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