215/40R18 or 225/40R18? - Kia Forte Forum : Sedan / Koup / Forte5 Forums
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#1 Old 11-11-2011, 02:08 PM
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Default 215/40R18 or 225/40R18?

Alright, I know these questions have been beat to death but I need some answers which I haven't been able to find. I currently have 215/40R18 rubber and come spring time I'll need some new tires.

My first question is who is running an 18x8 wheel, 35+ offset or lower, with 225/40R18 rubber and the Eibach springs? Are you rubbing, how bad, and how often, if at all?

My second question is I know 225 rubber will be wider and taller but really how noticeable will it be and what are the advantages/disadvantages? My main concern with 225 rubber is will it raise my ride height? I feel like I'm not low enough as it is and I don't want to be any higher.

And lastly, what do you think about a 225 in the back and a 215 in the front? There's a bit more wheel gap in the back which I think the 225 will fill up a little without rubbing issues. What are the advantages/disadvantages of that? Things like tire rotation, performance, etc.

Thanks in advance! SS.
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#2 Old 11-11-2011, 09:11 PM
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You won't be able to rotate front to back, just side to side.
Not sure if it will make it look weird with the back end higher.

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#3 Old 11-11-2011, 09:20 PM
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Hey Sub..im fine..u can see my pics in my garage of my Koup..I'm running 225/40/18 on eibachs and I don't rub at all..I've taken very sharp turns at like 35/40 mph with people in the car and still don't rub..performance is good for me..hope this helps..


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#4 Old 11-12-2011, 11:56 AM
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Thanks Drew, that's good to hear. From your pictures it looks like you're running a 18x8 with a 35+ offset, is that true?
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#5 Old 11-12-2011, 02:33 PM
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Honestly I'm not sure..but my rims came off an 07' Mazda 3 which I just googled and has an 18' rim offset of 42mm and they fit perfectly fine on my Koup..no issues..


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#6 Old 11-12-2011, 08:47 PM
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Read through this thread. It has some good information.

http://www.forteforums.com/forums/ko...8-lowered.html

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#7 Old 11-13-2011, 01:58 PM
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Quote:
Originally Posted by Koup SXR View Post
Read through this thread. It has some good information.

http://www.forteforums.com/forums/ko...8-lowered.html
Thanks SXR but I know about that thread, I posted in it several times.

I'm looking for someone with my exact specs who is using 225 rubber. No one in that thread is using a 18x8, 35+ offset, with 225 rubber. Most people on this forum have a 42+ or 45+ offset.
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#8 Old 11-14-2011, 10:14 AM
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^^^oops, my bad

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#9 Old 11-14-2011, 04:40 PM
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Quote:
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^^^oops, my bad
No biggie!

If anyone else has the setup I'm asking about I'd appreciate any info, thanks.
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#10 Old 03-26-2012, 11:39 PM
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Did you ever go ahead with the 225's, Subtle? Kinda still waiting for you to make the first move!
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#11 Old 03-27-2012, 03:57 PM
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I ahve 18x7.5 with a 35 offset... its .5 difference compared to yours.. but i'm not rubbing at all but i'm not lowered though.

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#12 Old 03-27-2012, 05:05 PM
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Originally Posted by remyxamotosis View Post
Did you ever go ahead with the 225's, Subtle? Kinda still waiting for you to make the first move!
I'm going to be buying new rubber sometime this week. Trying to paint my wheels and so far it's been a pain. Anyway, once I get that done I'm going to mount them and I'll let you know.

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I ahve 18x7.5 with a 35 offset... its .5 difference compared to yours.. but i'm not rubbing at all but i'm not lowered though.
Yeah the being lowered part is going to be the biggest difference. I'm gonna go with a 225 and if I end up having problems I'll deal with it afterwards. I'm also told that it won't affect my ride height at all compared to a 215 rubber. Really not sure if that's true or not.
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#13 Old 03-29-2012, 09:51 AM
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Hey Subtle. Definitely keep us updated when your done. I know that if you clear, then the setup I want will clear too. Plus I'd love to see pics with the painted wheels and 225s! Titanium ftw.

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#14 Old 04-13-2012, 02:50 AM
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The first series number in a tire size, like the 225 and 215, is just the width. The second number, 45 our 40, is the thickness. A 225 tire will just be wider and look great. I actually have those exact specs on my car now (225/40/18, 18x8, 35 offset), the only difference is I'm not lowered. I will be Saturday, but either way, I don't see there being any rubbing issue cause there's plenty of room...
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#15 Old 04-13-2012, 07:44 AM
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Quote:
Originally Posted by SubtleStyle View Post
I'm also told that it won't affect my ride height at all compared to a 215 rubber. Really not sure if that's true or not.
Well, the 225 has a diameter of 25.08" vs the 215's 24.77", so your ride height change will be about half of the difference - approximately 0.15".

As for running a staggered setup - as mentioned you will lose the ability to rotate front to back (and side to side if your tires are unidirectional). Worse still, wider tires on the back changes the grip ratio slightly and tends to induce understeer, something which FWD cars already tend to have in abundance (compared to most RWD vehicles), so more of that is not generally desirable.
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