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18 inch tire size

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Old Mar 31, 2025 | 03:13 PM
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Default 18 inch tire size
What size tires should I put on 18 7.5 +49 on the front and 18 8.5 +51 on the rear. Thanks for all help guys!
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Old Apr 1, 2025 | 05:16 AM
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225/40/18 and 245/35/18
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Old Apr 1, 2025 | 04:45 PM
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Originally Posted by Scigheras
225/40/18 and 245/35/18
Thanks man!
I have BC coilovers does that make much of a difference?
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Old Apr 2, 2025 | 04:00 AM
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Old Apr 2, 2025 | 01:29 PM
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225/40/18 has a diameter 25.1" and 245/35/18 is 24.8". You're better off going with 215/40/18 so that the diameters match front and rear at 24.8".
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Old Apr 3, 2025 | 04:59 AM
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Here's a link to a Tire Size Calculator which will help avoid drastically different sizes which can upset the anti-lock brakes, stability assist, and the speedometer. You still need to fit them in the wheel wells.

-- Chuck.
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Old Apr 3, 2025 | 01:15 PM
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Originally Posted by ryuken
225/40/18 has a diameter 25.1" and 245/35/18 is 24.8". You're better off going with 215/40/18 so that the diameters match front and rear at 24.8".
Stock CR tire sizing differs even more...
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