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Old 03-25-2018, 10:49 PM   #1
Rob99
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tire size change & speedo

Will the computer correct for a tire/wheel change from 18" to 19"?
Or is the size change insignificant to the speedo?
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Last edited by Rob99; 03-28-2018 at 09:48 PM. Reason: made correction to question.
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Old 03-26-2018, 08:04 AM   #2
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Wheel size has no effect on the reading only overall tire diameter does.
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Old 03-27-2018, 10:16 PM   #3
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thanks, so to be clear I'm going from 245/55R18 to 245/50/R19
corrected 245/50/R18
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Old 03-28-2018, 03:01 PM   #4
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Why that size, it's 1" bigger than stock 245/50/18.

https://tiresize.com/calculator/

You'll be a few mph off with that 1" taller tire.
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Old 03-28-2018, 04:11 PM   #5
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Quote:
Originally Posted by Rob99 View Post
thanks, so to be clear I'm going from 245/55R18 to 245/50R19
If you're going from what you stated above. Those tires are 99.999% identical in diameter.
You're speedometer will not change. That being said, if the stock tire size is 245/50/18. Then that's 1 inch taller. You will be going faster than the speedometer displays.
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Old 03-28-2018, 04:25 PM   #6
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Quote:
Originally Posted by grampa_ss View Post
If you're going from what you stated above. Those tires are 99.999% identical in diameter.
You're speedometer will not change. That being said, if the stock tire size is 245/50/18. Then that's 1 inch taller. You will be going faster than the speedometer displays.
Spot on. 245/55R18 and 245/50R19 tires are identical in size and the speedo won't be changed a bit.
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Old 03-28-2018, 04:54 PM   #7
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Quote:
Originally Posted by grampa_ss View Post
If you're going from what you stated above. Those tires are 99.999% identical in diameter.
You're speedometer will not change. That being said, if the stock tire size is 245/50/18. Then that's 1 inch taller. You will be going faster than the speedometer displays.
Yes the 2 sizes listed are identical. Just for info this is that size compared 245/50/18.

https://www.willtheyfit.com/index.ph...8-5&offset2=25

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Old 03-28-2018, 09:47 PM   #8
Rob99
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correction to my first post

Hey guys thanks for all the great reply's I made a mistake stating my stock /factory tire size, it is 245/50/18 not (55), so with the change to
245/55/19 I'm seeing in the post above it will be off a couple mph's,
faster or slower?
Also the reason I'm going to 19" is I can get perfect stock factory rims from a 2015 for a trade deal(from the person that bought my 2015) I like those style polished rims.
Here is a pic of the rims;
Name:  Camaro 2015.jpg
Views: 1358
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Old 03-29-2018, 07:39 AM   #9
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Quote:
Originally Posted by Rob99 View Post
Hey guys thanks for all the great reply's I made a mistake stating my stock /factory tire size, it is 245/50/18 not (55), so with the change to
245/55/19 I'm seeing in the post above it will be off a couple mph's,
faster or slower?
Also the reason I'm going to 19" is I can get perfect stock factory rims from a 2015 for a trade deal(from the person that bought my 2015) I like those style polished rims.
Here is a pic of the rims;
Attachment 926691
click the link in my post above it tells you everything you need to know including speedo error.
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Old 03-29-2018, 08:18 PM   #10
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Originally Posted by mjk3888 View Post
click the link in my post above it tells you everything you need to know including speedo error.
ok that's a great site thanks for that link.
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