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

Tires size Q?

Old 07-26-10, 07:55 PM
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mkivowner
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Default Tires size Q?

Hey guys,
What you guys recommends if I have...

Front 19X9” 5X114.3 ET38 BBM

Rear 19X10” 5X114.3 ET40 BBM

Thanks.
Old 07-26-10, 08:37 PM
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T-Rex06
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For the front, you can go with 245/35/19. For the rear, those offsets might require shaving. You can use 275/30/19.

Terrance
Old 07-26-10, 09:47 PM
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Originally Posted by T-Rex06
For the front, you can go with 245/35/19. For the rear, those offsets might require shaving. You can use 275/30/19.

Terrance

Thanks for the info.
Can I go up to 285 for the Rear?
Old 07-27-10, 07:27 AM
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Originally Posted by mkivowner
Thanks for the info.
Can I go up to 285 for the Rear?
Yeah, but you need to shave the rear fender lip.
Old 07-27-10, 08:54 AM
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Those offsets are slightly aggressive for an IS-F. For tire sizes, to keep your OD correct, the 245/35/19 is correct, however the rear should be able to fit a 295/30/19 just fine. A poster on here, Fig, has fitted a 305/30/19 on a 10" inch wheel.
Old 07-27-10, 09:14 AM
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Originally Posted by mkivowner
Thanks for the info.
Can I go up to 285 for the Rear?
Technically, 245/35/19 and 285/30/19 have the same overall diameter at 25.8" which means those are the ideal sizes to use. However, you'll have issues with your rear quarter panels due to the offsets of the rear rims.

245/35/19 has the overall diameter of 25.8" and 275/30/19 will have 25.6". The difference in O.D is negligible. If you're set on using 285/30/19, then be prepared to do some fender work. Hope this helps.

Terrance
Old 07-27-10, 10:28 AM
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^^ Don't forget the whole issue with different tire brands and stuff...

Results will vary.....

Joe Z
Old 07-27-10, 05:44 PM
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Originally Posted by Supraman16
Yeah, but you need to shave the rear fender lip.
Shave it better or Fender Lip Rolling? "just bought one rolling tool from Tirerack"

wow! too many options...

Joe Z,
I'm going w/ Pilot Sport PS2.
Old 07-31-10, 01:01 PM
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I'm still doing the homework

This is what Tirerack recommends

255/35/19
295/30/19


Michelin PS2's
Old 07-31-10, 02:19 PM
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Originally Posted by mkivowner
I'm still doing the homework

This is what Tirerack recommends

255/35/19
295/30/19


Michelin PS2's
Way too big, especially for the offsets you listed above. And even more so for the PS2's with run big to begin with.
Old 07-31-10, 04:05 PM
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Originally Posted by Supraman16
Way too big, especially for the offsets you listed above. And even more so for the PS2's with run big to begin with.

You're incorrect:

https://www.clublexus.com/forums/is-...derings-4.html


As I indicated above, the offsets will be a problem.

Lou
Old 08-01-10, 07:23 PM
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Guys,
Thank You So Much gave me all the info. but up until now I still don't know
what size Should I go for it!!!

My Wheels will be here this Week "www.wedsna.com/products/wedssport_sa55m.html" And I'm going
put Michelin Pilot Sport PS2.

Last edited by mkivowner; 08-01-10 at 07:32 PM.
Old 08-01-10, 09:36 PM
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As stated before, it depends if you are willing to shave the rear fenders or not. If not, sell those wheels and buy wheels with the correct offsets for the ISF...otherwise shave the fenders.

I think you should be able to fit a 245/35R19 on the front no problem with a 38mm offset on a 9 inch wheel...you might even be able to fit a 255/35R19 without rubbing.

You might be able to fit a stock 255/40R19 on a 10 inch wheel with a 40mm offset...even then it would be close. The problem is that is way too aggressive of an offset for the ISF.

If you are willing to shave the rear fenders, I would recommend 245/35R19s in the front and 275/30R19s in the rear…maybe 285/30R19s, but you would probably have to see what fits after you finish trimming.
Old 08-06-10, 07:56 AM
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hey Bao, there's a few things you want to consider here:

a) What type of drop are you doing and with what brand coils in terms of stiffness?
b) Wheel Offset
c) Brand of tires since they vary in shape (ex. Toyo and INVO are more rounded than Yokohama)
d) How much cargo / people you want to be able to drive around with

If you don't want to risk fender damage and still be able to take some people/luggage in the car go on the conservative side with the offset and tire width. Frankly a 275 or 285 tire is not going to make much visual difference however that maybe enough to cause rubbing which you do not want. I have yet to have someone come up and say "damn you went 275 instead of a 295"!

Stock IS-F fitment is:
19x8, +45 on a 225/40 tire up front
19x9, +55 on a 255/35 tire in back

My Advan RS-D which I'm sure you've seen has a perfect flush setup, no fender mods needed and I packed 6 people in the car with luggage on my KWV3's with no problems. Those specs are:

19x8.5, +45
19x9.5, +45

**I know a guy who has just 10mm more aggressive meaning +35 and he had to shave his fenders or he would rub (simply not worth the headache ImO)


gluck!
rick
Old 08-06-10, 08:01 AM
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s4play
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^here's a few shots of my current setup, perfectly flush and remember I DID NOT touch the fenders at all, perfectly stock!

hope this helps




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