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225 vs 245 tires

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Old 03-03-2009, 06:15 PM
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225 vs 245 tires

What are the actual pros? Cons, if there are any........
Old 03-03-2009, 06:32 PM
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pros: wider is better. more tire, more grip. 245's also look a bit nicer
remember to go 245 /40

cons: price?
some people say the steering doesn't feel as precise. (though having owned both sizes, I disagree with 245 feeling numb)
Old 03-03-2009, 06:57 PM
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does this knock the speedometer off any?
Old 03-03-2009, 06:59 PM
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Originally Posted by TheBurkeMan
does this knock the speedometer off any?
Not by much.

http://www.miata.net/garage/tirecalc.html
Old 03-03-2009, 07:05 PM
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^ thanks
Old 03-03-2009, 08:54 PM
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I just had a set of BF Goodrich g-force T/A KDW (245/40/18) tires on my 8 and I am totally impressed. I've been through the canyon roads in Malibu twice now, and there is a huge difference from stock. Lots of grip and they look way better.

But do as Jedi say: if you switch from 225's to 245's, you should switch from a 45 series profile to a 40 series profile. This will ensure that you have a similar rolling diameter and the least amount of speedometer error.

I had to explain this to COSTCO b/c they didn't want to install a non-stock sized tire. I had to show them that the rolling diameter and height profile was nearly identical to stock for them to do it.
Old 03-03-2009, 10:06 PM
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245's will also have more spring back when hitting the tight turns. So you are more **** to lose controll of the car if you are not use to sliding when thitttting them turns. The ones I had on 18"x8 with a 40 off set where fat tires and the side walls where soft.
So yea +1 with the 40 side wall.

Last edited by DOMINION; 03-03-2009 at 10:12 PM.
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Old 03-03-2009, 10:55 PM
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sure.

beers
Old 03-03-2009, 11:07 PM
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Hi guys, can I ask a total noob question? I can't understand how you can chose from a variety of tire sizes like 225 or 245 for a wheel? Shouldn't there just be one possible size that reflects the width of the wheel? I mean it's obvious that's not the case or this thread wouldn't exist, but could someone explain why? Thanks all!!
Old 03-03-2009, 11:36 PM
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What about 235 series tires, 235/40-18? Besides 225 or 245 we have this option available to us as well.
Old 03-03-2009, 11:41 PM
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the outside dia of the 225 / 45 / 18 is 25.9in.

that is what to shoot for..

tire rack is a great source of info.. on any tire and size.

beers
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