IS - 2nd Gen (2006-2013) Discussion about the 2006+ model IS models

Opinions for Tire Size

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Old 02-26-12, 08:16 PM
  #16  
GiantsFan
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Just FYI - tire sizes that are closest to OEM 18" rolling diameter are 225/35/19 and 255/35/19 (But long as you are 3% difference or under you are fine...)
Old 02-26-12, 08:23 PM
  #17  
SCWB
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For better wheel protection, go with:
235/35/19 Front
255/35/19 Rear
1 inch lowerd, no rubbing problem.

If you lower your car more than 1.5 inches, then you should go with 225/35/19 in front.

225/35 on 8.5" rim provides no side curb protection at all.

For the rear 9.5+35, you can go with 255/35/19 or 265/30/19 and won't have any rubbing problem no matter how much you lower your car. But 265/30/19 provides 79.5 mm of sidwall vesrus 89.25 mm of 255/35/19. That's almost 1 cm of extra protection.

With 265/35/19 you might rub with that spec when you lowered your car because of the taller side wall. The tire will also be too tall for IS factory spec too. So 255/35/19 would be the best pick, in my logic.
Old 02-26-12, 08:43 PM
  #18  
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^
The 9.5" with a 255/35 would have no curb protection too rite?

My thinking is this.
225 has acceptable wheel range of 7.5" - 9" and 255 has range of 8.5" to 10"

In both cases, with the 8.5" front and 9.5" rear, both are about 0.5" inch away from the maximum acceptable ranges for the stock sizes and would assume the way the tire opens up identically because both are 1" wider than minimum.

Since I have stock 18", the 8" front looks just right, with the lip sticking just out past the tire while the rear being 8.5" rear, looks a bit odd because it is at the minimum such that the lip ls a bit behind tire wall, such that getting a 9.0" should change it to make the lip just passed the tire wall so it would look identically how the front 8" does. Interestingly, this is what Lexus's recommends for their 19" forged wheel and Michelin's section width measurements are measuring based on 8" and 9" wheels respectfully with those sized tires.

Last edited by Sango; 02-26-12 at 08:55 PM.
Old 02-27-12, 07:34 AM
  #19  
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Can someone post a pic? It's hard to imagine with just the numbers. Since tires cost so much, want to get the right ones
Old 02-27-12, 08:29 AM
  #20  
is150
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Originally Posted by neomedic
^^^^^ Can someone post a pic of how much the lip will stick out on a 8.5 rim with a 225/35/19 tire??

THanks.
check out the first couple pics of this thread https://www.clublexus.com/forums/is-...rs-thread.html Javy is running 225/35/19 on the progressiv me 19x8,5 and 235/35/19 on the 19x8.5 volk te. google 225/35/19 19x8.5 for more pics and links. hope this helps.
Old 02-27-12, 08:51 AM
  #21  
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^
Had a look of the thread. There are several good examples where the lip is just exposed passed out of the tire wall. Suprized there was one runing 215 in the front !! The pic needs to show from diagonal or parallel perspective to see the tire wall and the lip exposure. Doesn't really be seem to be really good pictures showing it, did note people running those wheels but did increase the tire sizes so it does not provide the correct reference we are looking for.

I personally saw in my work parking lot an IS with work wheels using 225/35 and 265/30 rears using 8.5" and 9.5" respectfully and seen the exposure in person. If I have a chance, I could take a picture of it.

Last edited by Sango; 02-27-12 at 06:58 PM.
Old 02-27-12, 09:49 AM
  #22  
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215/35-19 on a 19x8.5" +22 wheel is fine for daily driving.

btw, not all tires have the same structural construction. but that should be a given.
Old 02-27-12, 06:09 PM
  #23  
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Originally Posted by neomedic
Can someone post a pic? It's hard to imagine with just the numbers. Since tires cost so much, want to get the right ones
Ok I will try to post the pic of my setup.


I know how you feel. I have been through the same dilemma before.
Old 02-28-12, 10:54 AM
  #24  
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^^^^ Thanks.
Old 02-28-12, 12:57 PM
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Originally Posted by SCWB
Ok I will try to post the pic of my setup.

I know how you feel. I have been through the same dilemma before.
Can you send me a pic of it too? I am interested to have a look.

------------

I also the IS350 at the employee parking lot again and took the picture of the wheels to see the lip again. Will post them sometime tonight.
Old 02-28-12, 05:05 PM
  #26  
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I will post pics here. But can't do it now since I am tied up with my work.

Give me a couple of days.
Old 02-28-12, 07:28 PM
  #27  
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Here are the pics. 2 IS's in the lot. There was a 3rd IS as well which I believe was on Volk wheels but it was 17, so I skipped that one!

From left to right:
9.5" rear and 8.5" front Work Wheels
9.0" rear and 8.0" front F-Sport Forged
Attached Thumbnails Opinions for Tire Size-9.5-rear.jpg   Opinions for Tire Size-8.5-front.jpg   Opinions for Tire Size-9-rear.jpg   Opinions for Tire Size-8-front.jpg  
Old 03-14-12, 11:04 PM
  #28  
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If I went with the Continental Extreme Contact DWS (50K tread life warranty with 540 UQTG) vs. the Continental ExtremeContact DW (340 UQTG), will I be sacrificing too much performance for extended tread life? I like to take corner somewhat aggressive, but it is a daily driver and I don't race or track.

A difference of 200 UQTG is quite a bit....would translate of a lot more road miles.

I keep reading that Continental have soft side walls that may bubble, but haven't read anything on the ExtremeContact DWS, rather other Continental tires. Should I worry about this? And these will already be low profile tires with a 35 side profile.

thanks.
Old 03-20-12, 10:33 PM
  #29  
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wont the stock allignment camber wear kill them way before the 50k? I doubt the warranty covers that. Question Im on Stock ISF wheels and im dropped on Fsport Suspension on my next tire set I want to go wider im thinking:

235/35/19 front
265/35/19 rear

Is that too aggressive? You think it will run with that minimal drop? My gut tells me know but I figured id run it buy you guys. I dont want to roll my fenders but I dont mind pushing back plastics with the heat gun
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