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Old 06-03-2013, 10:57 PM   #1
Oi8ur5.0
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Default 235/45/17 vs 235/40/18 comfort

Just bought a new 2013 REX

This car will be used for long distance trips at times (business) but I'd love to put my old 18x8 ssr competitions on it. Don't care for the stock wheel look....and the SSR's are light as hell and made a significant change in overall drive feel with my previous cars.

So I really like the stock wheel/tire/handling feel. Drove 500 miles on the highway already and couldn't be happier. My question is: has anyone found an 18 wheel tire combo that they personally feel retained a stock like ride ? Also....if I go to a 245/40/18, how much difference can be expected from stock steering feel ? Hope to hear feedback from those who have made that same change

Of course I wouldn't expect there to be zero difference...but I'm looking for a minimal difference setup. I'd source a reasonably soft sidewall tire as I'm not looking to be hell on corners all day long.

Thanks for your feedback..
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Last edited by Oi8ur5.0; 06-10-2013 at 07:36 PM.
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Old 06-10-2013, 07:37 PM   #2
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bump...and I updated my questions.

Thanks for your feedback.
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Old 06-10-2013, 08:17 PM   #3
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there is no answer to this.....the only way to know if YOU are gonna like it or not is to try it
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Old 06-11-2013, 12:01 AM   #4
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Originally Posted by Uncle Scotty View Post
there is no answer to this.....the only way to know if YOU are gonna like it or not is to try it
Welp.....that gits a lil pricey...as we all know.

Just hoping those who have made this change can chime in as to "what changed" when they did so.

A variety of folks description of their ride quality can give me an idea of what's worth a shot....and whats not.

I should have stated that I will be keeping stock ride height also.
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Old 06-11-2013, 07:53 AM   #5
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I went from 235/45R17 OEM Dunlops to 255/35R18 Michelin Pilot SS on the OEM suspension. I didn't notice a ride difference, so it's probably not substantial. The Michelins are just about the same diameter as OEM, just a hair smaller and of course a much lower sidewall. The huge improvement in handling blew me away however.

I'd think it would vary from one tire to the next though. Some might have stiffer sidewalls than other.

If not the original size, I would go with the 245/40R17 if I were you. That would be a plus 1 size and keep about the same sidewall height as your current tire, with a wider tread for better dry traction. 235/40R17 would only lower your sidewall and throw your speedometer off (it would read faster than you are going) for no benefit at all.

Last edited by dmk0210; 06-11-2013 at 08:00 AM.
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Old 06-11-2013, 11:08 AM   #6
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Quote:
Originally Posted by dmk0210 View Post

If not the original size, I would go with the 245/40R17 if I were you. That would be a plus 1 size and keep about the same sidewall height as your current tire, with a wider tread for better dry traction. 235/40R17 would only lower your sidewall and throw your speedometer off (it would read faster than you are going) for no benefit at all.
Do you mean a 245/40/18?
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Old 06-11-2013, 11:27 AM   #7
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Originally Posted by dmk0210 View Post
I went from 235/45R17 OEM Dunlops to 255/35R18 Michelin Pilot SS on the OEM suspension. I didn't notice a ride difference, so it's probably not substantial. The Michelins are just about the same diameter as OEM, just a hair smaller and of course a much lower sidewall. The huge improvement in handling blew me away however.

I'd think it would vary from one tire to the next though. Some might have stiffer sidewalls than other.

If not the original size, I would go with the 245/40R17 if I were you. That would be a plus 1 size and keep about the same sidewall height as your current tire, with a wider tread for better dry traction. 235/40R17 would only lower your sidewall and throw your speedometer off (it would read faster than you are going) for no benefit at all.

Good feedback....thank you !

Did the 255 width change your steering feel much ?
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Old 06-11-2013, 12:49 PM   #8
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Quote:
Originally Posted by phenryiv1 View Post
Do you mean a 245/40/18?
Yes, actually. Thanks.

... But 17s are fine too.

Quote:
Originally Posted by Oi8ur5.0 View Post
Good feedback....thank you !

Did the 255 width change your steering feel much ?
No, it was fine. I'm surrounded by windy mountain roads, the better tires are more responsive than the OEM tires and grip the road much better. Maybe if you were running slaloms around cones you may notice a change, but for spirited canyon driving it's great.

I was actually worried about tramlining (however you spell that) where wider tires try to follow road imperfections, but never noticed any of that.

I haven't even noticed any big difference in mileage either, so I haven't found any caveats at all to this upgrade, except that since I have summer tires, come cold weather I'll need some sort of winter or all season tire.

Last edited by dmk0210; 06-11-2013 at 12:55 PM.
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Old 06-14-2013, 08:52 AM   #9
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Oi8ur5.0,

Like stated here you will not know exactly until you try it but, I did this change on my '11 WRX. I went from the OEM set up to 235-40-18 both with stock suspension. Did I notice any difference? Yes and no, Being that the tires on my rc-t4's are Bridgestone RE-11's I got slightly better grip than the oem setup. This plus the tad bit smaller sidewall allowed less flex. But with the slightly smaller sidewall and the tire compound it did produce a slightly harder of a ride. Nothing crazy at all like my lowered mustang on H&R SS / Eibach Pro Dampers. There is barely any difference between the rotation of these two tires so my speedometer and odometer are almost spot on with the original OEM setup. It could be my imagination but I feel that the wheel well gets filled up a bit more (being that I run a +48 offset and they are still sunken into the fender) but also providing a hair slighter of ride height....again it could be my imagination. I have been wanting to bump up to a 255 series tire, but in the long run and practicality of my wrx being my daily driver, I do not feel it is necessary to do so other then for a wider looking tire, a bit more contact area (good and bad in its own way for a daily) and that "cool factor" This is just my opinion, what ever way you go I am sure you will like the change being that you all ready do not like the OEM look.
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Old 06-15-2013, 03:04 AM   #10
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Quote:
Originally Posted by Diablosz400 View Post
Oi8ur5.0,

Like stated here you will not know exactly until you try it but, I did this change on my '11 WRX. I went from the OEM set up to 235-40-18 both with stock suspension. Did I notice any difference? Yes and no, Being that the tires on my rc-t4's are Bridgestone RE-11's I got slightly better grip than the oem setup. This plus the tad bit smaller sidewall allowed less flex. But with the slightly smaller sidewall and the tire compound it did produce a slightly harder of a ride. Nothing crazy at all like my lowered mustang on H&R SS / Eibach Pro Dampers. There is barely any difference between the rotation of these two tires so my speedometer and odometer are almost spot on with the original OEM setup. It could be my imagination but I feel that the wheel well gets filled up a bit more (being that I run a +48 offset and they are still sunken into the fender) but also providing a hair slighter of ride height....again it could be my imagination. I have been wanting to bump up to a 255 series tire, but in the long run and practicality of my wrx being my daily driver, I do not feel it is necessary to do so other then for a wider looking tire, a bit more contact area (good and bad in its own way for a daily) and that "cool factor" This is just my opinion, what ever way you go I am sure you will like the change being that you all ready do not like the OEM look.
Appreciate that feedback. You say you are on stock suspension as well ? Do you have a pic of your setup ? Yeah I'm hoping that if I go with a 245/40/18 on my ssr competitions that it will also fill up the wheel well look as well. I know physically it's not much of a change....but sometimes it does not take much.
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Old 06-15-2013, 04:09 PM   #11
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Sure do, here is 235/40/18 on 18x8.5 +48 offset.



The picture was taken with my cellphone but you get the idea.
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Old 06-16-2013, 01:23 AM   #12
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Quote:
Originally Posted by Diablosz400 View Post
Sure do, here is 235/40/18 on 18x8.5 +48 offset.



The picture was taken with my cellphone but you get the idea.

Nice....thank you !

Man that thing is business That bush guard/light set up is sweet.

I wish I could have the nads/brains to use roof rack for my bike. I have a garage.....and I know damn well what will happen
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