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Old 07-15-2015, 08:20 PM   #1
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Tire Size for Tune

Why do they ask for a tire size in your info for a tune???

May be a noob question, but I ask because I switched to a different size tire in the rear.
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Old 07-15-2015, 08:21 PM   #2
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To correct speedometer.


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Old 07-15-2015, 08:24 PM   #3
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So if I went from a 275/35/20 to a 285/30/20 my speedo is off?
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Old 07-15-2015, 08:55 PM   #4
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http://tire-size-conversion.com/spee...r-calibration/


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Old 07-15-2015, 09:09 PM   #5
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Its only off by 2 mph
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Old 07-15-2015, 09:10 PM   #6
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Yeah but they would also have to know what tire size came standard with your vehicle and/or ask something about if they are original tire size, etc.
Tire size in and by itself doesn't tell the whole story. IMHO
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Old 07-15-2015, 09:24 PM   #7
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Quote:
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Yeah but they would also have to know what tire size came standard with your vehicle and/or ask something about if they are original tire size, etc.

Tire size in and by itself doesn't tell the whole story. IMHO
You don't need to know what was on the car previously to fix speedo with a tune. The tune is a new file. Knowing what was on the car previously is simply to tell you if you're speedo is accurate or not.

There's a formula to tell you what your speedo should read with whatever gears/tires you have.

The website I linked simply takes that formula for both sizes and tells you the difference.


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Old 07-15-2015, 09:36 PM   #8
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Quote:
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You don't need to know what was on the car previously to fix speedo with a tune. The tune is a new file. Knowing what was on the car previously is simply to tell you if you're speedo is accurate or not.

There's a formula to tell you what your speedo should read with whatever gears/tires you have.

The website I linked simply takes that formula for both sizes and tells you the difference.


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Okay, not necessarily to correct it but to make sure it's correct.
I was thinking that there would be no reason to correct it(or fix it) if it had OE size tires. But like you say they would do it anyway to make sure it's correct.
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Old 07-22-2015, 05:48 PM   #9
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I went from 17" OEM to 18" staggered. I never notice a difference. Never even thought to see about retuning either


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Old 07-22-2015, 10:08 PM   #10
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I went from 17" OEM to 18" staggered. I never notice a difference. Never even thought to see about retuning either


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It's the tire size that could make a difference, not the rim size.
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Old 07-22-2015, 10:15 PM   #11
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So which tire size should you use if you're running a staggered setup, front or back?


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Old 07-22-2015, 10:16 PM   #12
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I just adjusted it myself in the tuner. Went to the additional options and then the tire size section, it asks for your revs per mile. Take your tire size and convert it to the overall diameter, that will correlate to a number in revs per mile. Find that number in the tuner and click it.


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Old 07-22-2015, 10:17 PM   #13
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So which tire size should you use if you're running a staggered setup, front or back?


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It's based off of the drive tires....... So rear


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Old 07-23-2015, 01:44 AM   #14
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Quote:
Originally Posted by Diehard View Post
It's the tire size that could make a difference, not the rim size.

I'm not the smartest man, but I'm sure it pretty obvious what I'm talking about without going in to detail. The tires on my SVE Drift(which is a staggered setup) would not fit on my smaller OEM rim. Hence a difference size tire when I can't remember the radial numbers


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Old 07-23-2015, 02:56 AM   #15
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Quote:
Originally Posted by Tyriqq View Post
I'm not the smartest man, but I'm sure it pretty obvious what I'm talking about without going in to detail. The tires on my SVE Drift(which is a staggered setup) would not fit on my smaller OEM rim. Hence a difference size tire when I can't remember the radial numbers


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But you can go from 17" to 18" wheels without your overall tire diameter changing. That's what he's trying to say. Wheel size means nothing by itself when talking tire diameter and speedo corrections.
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Old 07-23-2015, 03:42 AM   #16
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So like I said in my OP. I switched to a staggered setup. Just eyeballing you can tell the radius is different in the rear. Like someone asked in this post. So what am I missing


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Old 07-23-2015, 08:29 PM   #17
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So like I said in my OP. I switched to a staggered setup. Just eyeballing you can tell the radius is different in the rear. Like someone asked in this post. So what am I missing


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That everyone else is talking about tire diameter and you're talking about wheel size, which is in fact two separate things. OP changed his rear TIRE size which DOES affect the speedo. You changed WHEEL size which DOESN'T affect the speedo. Your wheel diameter changed but your tire diameter more than likely did not (at least in the rear) which is why you didn't notice a change in your speedo.

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