Tire Size Questions - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 21 (permalink) Old 09-25-2012, 03:05 PM Thread Starter
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Tire Size Questions

Riggs. What tire size did you have factory?


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post #2 of 21 (permalink) Old 09-25-2012, 03:11 PM
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Not sure on tire. Rim was 15. I'm guessing 195/60?
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post #3 of 21 (permalink) Old 09-25-2012, 03:15 PM Thread Starter
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Yup, that would have been it. So you increased the dia. of the rim by 3", the width by 25mm you are ready 2.3% too slow on the speedo. If you had the speedo set to 77 the cop should have clocked you at 78.77 not 81

---------- Post added at 05:15 PM ---------- Previous post was at 05:14 PM ----------

ah ha, if you had a 195/55/15 as a stock. cruise at 77 would net an actual 81 reading by the local bacon.


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post #4 of 21 (permalink) Old 09-25-2012, 03:16 PM
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Originally Posted by Blackbalts View Post
Yup, that would have been it. So you increased the dia. of the rim by 3", the width by 25mm you are ready 2.3% too slow on the speedo. If you had the speedo set to 77 the cop should have clocked you at 78.77 not 81

---------- Post added at 05:15 PM ---------- Previous post was at 05:14 PM ----------

ah ha, if you had a 195/55/15 as a stock. cruise at 77 would net an actual 81 reading by the local bacon.
Then he lied or pulled me over instead of someone else :(. I believe my new tire size is a 225. Since I think that's as big as it goes without rubbing
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post #5 of 21 (permalink) Old 09-25-2012, 03:20 PM Thread Starter
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I think Agita runs a 235 without rolled fenders.

---------- Post added at 05:20 PM ---------- Previous post was at 05:17 PM ----------

It also will depend on your drop and size rim. What width is your rim?


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post #6 of 21 (permalink) Old 09-25-2012, 03:21 PM
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post #7 of 21 (permalink) Old 09-25-2012, 03:25 PM Thread Starter
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Same width as mine. I would venture to guess you could fit the 235's in. Might need to camber since you have the 18" rims. Camber kit is only $20 or so depending where you look.


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post #8 of 21 (permalink) Old 09-25-2012, 03:31 PM
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I'm good haha. It's a dd so that's not important
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post #9 of 21 (permalink) Old 09-25-2012, 03:42 PM Thread Starter
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Yeah, extra camber is no bueno for a DD!

Come to think of it Agita has the stock SS 18" rims with 235 on it so yes, totally is possible. I would ask if he does have camber kits or not but it can be done! Looks way more bad ass than the 215. I know my 225's make me smile when I see that fat piece of rubber sticking out the wheel well!!

---------- Post added at 05:42 PM ---------- Previous post was at 05:33 PM ----------

If you are looking for more flush than the smaller the side wall the better. I'm really regretting getting 50 for the side wall, but it does give my car a different look than other balts. So thats kind cool I guess. I just get roll over when I'm taking those really tight turns and it hurts my performance. Next year will be 235/40/17 for sure.


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post #10 of 21 (permalink) Old 09-25-2012, 03:52 PM
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My car is an 09 LS with XFE package. It runs 195/65/15 stock. My 18's are a 225/40/18 to keep the diameter the same.
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