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18" Tire Size

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Old Nov 29, 2017 | 04:50 PM
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An UrgeTo Dance's Avatar
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Default 18" Tire Size
I recently bought a 2001 but the owner before me had changed out the stock wheels to an 18" all around set up. The wheels aren't bad so I was wondering what size tires I would need in order to keep the staggered setup for the traction control. Right now the wheels have 275/40r18's on them.
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Old Nov 29, 2017 | 05:13 PM
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If you were to keep the 275's as your fronts
275 / 40 - 18 = 26.7 dia.
This would work to keep TC happy on the rear
295 /40 - 18 = 27.3 dia.
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Old Nov 29, 2017 | 05:53 PM
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Originally Posted by zone-7
If you were to keep the 275's as your fronts
275 / 40 - 18 = 26.7 dia.
This would work to keep TC happy on the rear
295 /40 - 18 = 27.3 dia.
I don't see many options in that size. Do you think keeping the 275's as rear and going smaller would work? I have no clue how tire sizing works to do the math myself.
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Old Nov 29, 2017 | 06:23 PM
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I'm considering & shopping Hankook RS 4s

If you were to keep the 275s as the rear

255/35-18 = 25.0 dia. would work
265/35-18 = 25.3 dia. would also work
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Old Nov 30, 2017 | 11:42 AM
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275/35/18 front
275/40/18 rear
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Old Nov 30, 2017 | 12:22 PM
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275/35/18 = 25.6 dia.
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Old Nov 30, 2017 | 11:28 PM
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In my research when I went to 18" wheels front and rear, I went with 265/35-18 fronts and 295/35-18 rears. Correct diameters and worked perfectly, never any traction control problems. I used 10" wide wheels in the front and 11" wide in the rear.
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Old Dec 1, 2017 | 01:06 PM
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Originally Posted by zone-7
275/35/18 = 25.6 dia.
Yes & 275/40/18 is 26.6
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Old Dec 1, 2017 | 01:18 PM
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305-35-18 Nitto Nt555R on Wagon Wheels
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Old Dec 2, 2017 | 11:41 AM
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I'm running 295/35/18 on C5 18x9.5 on all 4 corners. I drive mine daily and traction control doesn't care.
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Old Dec 2, 2017 | 11:46 AM
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I'm with 2001CamaroGuy... 18x10.5 on mine all 4 corners, 295/35/18 All 4 corners. Traction Control and Acrive Handling don't give me any issues.


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Old Dec 5, 2017 | 08:39 AM
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Look at these two links for discussion:

Here's a link to calculator that former C5 owner (and tech contributor) Toque used: http://www.rimsntires.com/specspro.jsp

And here's a link to Toque's discussion of wheel/tire fitment issues: http://www.toquez06.com/wheels.html

The Lizzard
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Old Dec 5, 2017 | 12:38 PM
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Originally Posted by slow_pokeC5
I'm with 2001CamaroGuy... 18x10.5 on mine all 4 corners, 295/35/18 All 4 corners. Traction Control and Acrive Handling don't give me any issues.


Did you have to trim your front brake ducts? My front tires just slightly rub the front ducts at full lock.
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Old Dec 5, 2017 | 07:55 PM
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18x9.5 front with a 275/35/18 and a 18x10.5 with a 295/35/18
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