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Old 07-19-2013, 02:12 PM   #1
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tire size question

Would larger tires throw off shift points? I know they throw the speedo off but i didnt know if shift points are effected
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Old 07-19-2013, 02:50 PM   #2
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If they throw off the speedo, I would assume yes. Although unless it's drastically different in diameter, I don't think it would make it unforgivable. What kind of change in size are we talking about?
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Old 07-19-2013, 03:08 PM   #3
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yes and how much depends on how much of a difference. it could be like switching from 3.42 to 3.44 if its only a small difference but yes there will be one.
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Old 07-19-2013, 03:36 PM   #4
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Wide....no.
Tall....yes.
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Old 07-19-2013, 05:44 PM   #5
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Quote:
Originally Posted by jhobbins View Post
Would larger tires throw off shift points? I know they throw the speedo off but i didnt know if shift points are effected
No, because the VSS and RPM relationship would still be the same.
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Old 07-19-2013, 05:47 PM   #6
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I was thinking no because the tranny shifts based off the pcm reading and not the speedometer reading.

The tires on the car are 295 35 r18. Its still tuned for stock size. I can easily change it i just haven't yet lol. I figured i wasn't hurting anything but then i started thinking about the gear shifting
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Old 07-19-2013, 06:11 PM   #7
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Quote:
Originally Posted by jhobbins View Post
I was thinking no because the tranny shifts based off the pcm reading and not the speedometer reading.

The tires on the car are 295 35 r18. Its still tuned for stock size. I can easily change it i just haven't yet lol. I figured i wasn't hurting anything but then i started thinking about the gear shifting
That equates to an overall (tire) diameter of 27.13 inches.
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Old 10-08-2013, 04:55 PM   #8
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Figured I'd revive an older thread rather than start a new one.
I've got 305/30/19 on my rear c6 rims right now. Would I be able to put 285/35/19 on them?
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Old 10-08-2013, 07:11 PM   #9
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Quote:
Originally Posted by calandro View Post
Figured I'd revive an older thread rather than start a new one. I've got 305/30/19 on my rear c6 rims right now. Would I be able to put 285/35/19 on them? Thanks
Depends on how wide the wheel is. Only thing you have to worry about not fitting right is the width. If the wheels are 9-9.5" wide you will be ok for the 285's.
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Old 10-08-2013, 07:33 PM   #10
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Ya I believe the c6 wheels are 9.5"
Thank you!
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Old 10-08-2013, 07:37 PM   #11
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Quote:
Originally Posted by calandro View Post
Ya I believe the c6 wheels are 9.5" Thank you!
Will be fine then. You're welcome.
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