IS F (2008-2014) Discussion topics related to the IS F model

Michelin PSS on OEM size

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Old 02-02-16, 08:25 PM
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NSXGuy
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Originally Posted by Piciu
Guys, we're talking here about OEM IS-F wheels.

What about Option 3 - step up only to 235/40 and 265/35. Anybody using this setup?
That's what I'm leaning toward for me next set. Haven't read about anyone doing this yet.
Old 02-02-16, 09:44 PM
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blackisF08
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Originally Posted by socal3
Didn't even think about 265. Good idea
if i wanted to upgrade just one size 235.265 would perfect but more meat in the back looks mean on the car and more grip on a straight line also. ps for the record 08 m3 uses 235F and 265R
Old 02-03-16, 05:12 AM
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2URGSE
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I'm running the 235/40 and 265/35 setup with the PSS and I'm pretty happy.
Old 02-03-16, 10:00 AM
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Piciu
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What kind of wheels do you have? 8x19 and 9x19?
Any rubbing issue with stock suspension?
Old 02-03-16, 11:00 AM
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mikersoft
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Originally Posted by Piciu
Guys, we're talking here about OEM IS-F wheels.

What about Option 3 - step up only to 235/40 and 265/35. Anybody using this setup?
Originally Posted by NSXGuy
That's what I'm leaning toward for me next set. Haven't read about anyone doing this yet.
Originally Posted by blackisF08
if i wanted to upgrade just one size 235.265 would perfect but more meat in the back looks mean on the car and more grip on a straight line also. ps for the record 08 m3 uses 235F and 265R
Originally Posted by 2URGSE
I'm running the 235/40 and 265/35 setup with the PSS and I'm pretty happy.
I ran a 235/265 PSS set-up for awhile, but I wasn't satisfied with it.. I felt the car still had too much understeer on turn-in.

I jumped up to 255 on the fronts & I love it (still running 265 rears). If your front wheels aren't wide enough (pre '12) for a 255, I'd recommend at least going to 245. YMMV....

-Mike
Old 02-03-16, 11:05 AM
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Piciu
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Thanks for comment Mike. But no rubbing on stock suspension?

Yes, I have pre-'12 wheels (19x8 and 19x9) and I would happily jump on 245/275 setup, but 245 on 19x8 seems somehow too much. Maybe for normal driving it's fine, but wouldn't it be too wide for these wheels for occasional track? PSS is a bit wider than other tires too.

Did anybody track their IS-F with 245/275 PSS set on '08 wheels? No problem with front tire being too 'floaty' (because of narrow rim)?

Last edited by Piciu; 02-03-16 at 11:10 AM.
Old 02-03-16, 11:09 AM
  #22  
lobuxracer
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Hence the whole reason I bought the later model OEM wheels. That extra half inch in width opens a whole lot of doors for sizing. I am running 255/275 PSS. There are a couple of folks who have done this on the earlier model wheels and have stated they work just fine. I'm not a big fan of going wider than the tire manufacturer recommends, but it can work. I ran 245/275 on the earlier model wheels and it worked reasonably well.

235/265 is going to do some really odd things in terms of suspension geometry - scrub radius in the front will be significantly different, so I don't know if I'd be excited about that. If this isn't a big deal, you're primarily concerned with appearance and don't push the car's mechanical performance limits, you'll likely be fine.
Old 02-03-16, 11:12 AM
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NSXGuy
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Originally Posted by lobuxracer
There are a couple of folks who have done this on the earlier model wheels and have stated they work just fine. I'm not a big fan of going wider than the tire manufacturer recommends, but it can work. I ran 245/275 on the earlier model wheels and it worked reasonably well.

235/265 is going to do some really odd things in terms of suspension geometry - scrub radius in the front will be significantly different, so I don't know if I'd be excited about that. If this isn't a big deal, you're primarily concerned with appearance and don't push the car's mechanical performance limits, you'll likely be fine.
How does the 235/265 change the scrub radius in front significantly and 245/275 does not? Thanks for educating us!
Old 02-03-16, 11:45 AM
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Piciu
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Originally Posted by lobuxracer
I ran 245/275 on the earlier model wheels and it worked reasonably well.
Did you track your car with this setup? I'm really concerned that 245 is just too much for 19x8 wheel.
Old 02-03-16, 11:47 AM
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Originally Posted by lobuxracer
Hence the whole reason I bought the later model OEM wheels.
It's almost impossible to get them in Europe And dealer price is just ridiculous.
Old 02-03-16, 12:59 PM
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Originally Posted by lobuxracer
Hence the whole reason I bought the later model OEM wheels. That extra half inch in width opens a whole lot of doors for sizing. I am running 255/275 PSS. There are a couple of folks who have done this on the earlier model wheels and have stated they work just fine. I'm not a big fan of going wider than the tire manufacturer recommends, but it can work. I ran 245/275 on the earlier model wheels and it worked reasonably well.

235/265 is going to do some really odd things in terms of suspension geometry - scrub radius in the front will be significantly different, so I don't know if I'd be excited about that. If this isn't a big deal, you're primarily concerned with appearance and don't push the car's mechanical performance limits, you'll likely be fine.
So to confirm, you are running 255/35 up front and 275/30 rears.......and are very happy with it? I'm intrigued, as I want to go wider and was all but sold on the 245/35 and 275/30 setup.

Thanks for the input!
Old 02-03-16, 01:01 PM
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Originally Posted by NSXGuy
How does the 235/265 change the scrub radius in front significantly and 245/275 does not? Thanks for educating us!
The tire diameter is significantly different on the 235. To maintain the suspension geometry, you want to fit tires with diameters as close as possible to the OEM diameters. Scrub radius is one of the numbers I really don't like to deviate from if I can avoid it. It can cause all kinds of weird handling issues. 255 is actually pretty close to ideal in the front.
Old 02-03-16, 01:03 PM
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Originally Posted by ssis300
So to confirm, you are running 255/35 up front and 275/30 rears.......and are very happy with it? I'm intrigued, as I want to go wider and was all but sold on the 245/35 and 275/30 setup.

Thanks for the input!
Yes. Essentially put the OEM rears on the front and fit the 275/30 in the rear. I'd prefer 285 or 295, but they're not a great choice with a 9 1/2" rim in the back.
Old 02-03-16, 01:36 PM
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Originally Posted by lobuxracer
The tire diameter is significantly different on the 235. To maintain the suspension geometry, you want to fit tires with diameters as close as possible to the OEM diameters. Scrub radius is one of the numbers I really don't like to deviate from if I can avoid it. It can cause all kinds of weird handling issues. 255 is actually pretty close to ideal in the front.
I was actually looking at 235/35/19 & 265/30/19 for my 2011 wheels. Seems those are very close to OEM diameters. Thoughts?

I guess I'm a little hesitant on the 245 & 275's on the 2011 wheels because I'm not sure the wheels are really wide enough for those tires.
Old 02-03-16, 01:39 PM
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Originally Posted by lobuxracer
Yes. Essentially put the OEM rears on the front and fit the 275/30 in the rear. I'd prefer 285 or 295, but they're not a great choice with a 9 1/2" rim in the back.
Significant/noticeable dip in gas mileage??


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