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Discussion Starter · #1 ·
Looking in some 18" wheels, but I am debating on 2 tire sizes; 225/45/18 or 245/40/18. These will only be used during the summer time. Is there any difference in performance and/or ride quality between these? Which one would you go with?
 

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2003 CTS-X
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Hey buddy, I have the 245/40/18's on mine and if rides great! And theyre NOT $2000 tires either! I think you will be happy with the wider tire overall, but its mostly up to preference. I will be running the 275/30/19's in the rear when I step up my rim size but for now I'm very happy. I've even widened the rear wheel track by 1" so that the outside of the tire sits flush with the fender like the fronts do. Good luck with your choice, hope all works out for ya!
 

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2006 3.6-Volant CAI, V-exhaust, LED swap, Clear DRL, 6000k
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use a tire size calculator to see what will be closest to your current setup.
 

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All else being equal... The 225/45/18 should ride a little smoother. The 245/40/18 will give you alot more grip then the other choice. Generally, the wider and lower profile the tire, the higher it can perform. Also, a taller sidewall generally means itll ride a little smoother.
 

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Discussion Starter · #5 ·
Hey guys, thanks for your responses. Ya I was leaning towards the 225... but I do like the profile better of the 245. Since they will only be seasonal, I might just go with the 245 for a lil better performance like you said. I guess it will have to be one of those purchase time decision.
 

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Discussion Starter · #6 ·
...I will be running the 275/30/19's in the rear when I step up my rim size but for now I'm very happy. I've even widened the rear wheel track by 1" so that the outside of the tire sits flush with the fender like the fronts do.
Nice, we'll have to see pics if you get that done! And that is a good idea to widen the rear.
 

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03 CTS 3.2L (Sold) / 09 CBR 600rr /2014 GMC Sierra
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i just looked up both tire sizes you were asking about and it said that they are both too small. you need to use 20" tires.
245/35/20 is actually what it said to use.
 

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Discussion Starter · #8 · (Edited)
i just looked up both tire sizes you were asking about and it said that they are both too small. you need to use 20" tires.
245/35/20 is actually what it said to use.
Hahaha! Ya... I knew one of you would tell me that, it was just a matter of time! Well I know I won't be able to join that 20/20 club... idk... don't really want to go over 19's. Sorry Megan Fox :(
 

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Hahaha! Ya... I knew one of you would tell me that, it was just a matter of time! Well I know I won't be able to join that 20/20 club... idk... don't really want to go over 19's. Sorry Megan Fox :(
your loss...all the ballers hang out in the 20-20 club.:cool2:
 

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Keep weight in mind. No point going to wide tire with 60+lbs on the wheel in total.
 

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2013 Acura ILX / 2011 Camaro LS
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I had 225/50/18's and went to 245/45/18's....Didn't notice any difference in the Ride Quality.
 

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