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Old 03-06-2014, 12:12 PM   #36
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Quick question guys, will I have to update my bama tuner when I put the 315s on?
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Old 03-06-2014, 12:42 PM   #37
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If the overall diameter of the tire is bigger then you will have to get your speedometer recalibrated. Otherwise no.
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Old 03-06-2014, 12:43 PM   #38
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What scotty said ^

What is the tire size you are going from, and what is the tire size you are going to? Most likely overall diameter is going to change a bit.
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Old 03-06-2014, 12:46 PM   #39
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Ok the tire I'm going to replace is a 245/45/17 and the new one is 315/35/17. Diameter is the middle number right?
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Old 03-06-2014, 12:51 PM   #40
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The middle number is expressed as a percentage of your width. So you use the width, the sidewall percentage and the actual rim to calculate the diameter in overall inches.

So a 245/45-17 is about a 25.6" height , which is stock size.

Your 315/35-17 is going to be a 25.6" also. So you won't need to adjust it.

This is what I use to calculate.
Tire Height Calculator
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Old 03-06-2014, 12:52 PM   #41
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Take for example my wheel set up. I had the same stock set up as you, but now I have 285/35-18 in back. Which is a 25.9", .3" taller.
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Old 03-06-2014, 12:55 PM   #42
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Quote:
Originally Posted by Soccerluvr4 View Post
The middle number is expressed as a percentage of your width. So you use the width, the sidewall percentage and the actual rim to calculate the diameter in overall inches.

So a 245/45-17 is about a 25.6" height , which is stock size.

Your 315/35-17 is going to be a 25.6" also.

This is what I use to calculate.
Tire Height Calculator
So according to this calculator I won't need to change tune? I did set the new tire beside the one that's on the car now and it looked like it would be a little bit taller but it might not once it is on the car
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Old 03-06-2014, 12:57 PM   #43
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Yea you don't need to. Since its the same overall diameter.
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Old 03-06-2014, 12:58 PM   #44
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Quote:
Originally Posted by Soccerluvr4 View Post
Yea you don't need to. Since its the same overall diameter.
Ok man thanks for looking that up!
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Old 03-06-2014, 09:08 PM   #45
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You can also just hit up tirerack.

I myself just ordered the Bfg tires today. Liked the mickeys but tirerack is having a special on the Goodrich tires and I've had them before. 275/40/18 for the rear and 235/45/18 up front. This may seem small but bfgs run a half inch wider than other brands in my experience and tirerack confirms this. The 235s are 9.3 section width and a 9" tread while the 275s are 10.9 section width and 10.7 tread which is really big for a 275. Should fit well on staggered 18x9/18x10.5

Also +1000 for tirerack yet again. I placed the order at 4pm today and I had tracking numbers at 5:30 for Monday delivery and shipping will be free with a $50 rebate card.

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