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in talking with HRE they have told me that an 8.5" rim will fit on the front, with a 255/35/19, and a 10.5" rim will fit on the rear with a 295/30/19 with no issues. these tire sizes are also as close to OE rolling radius as it gets.
Other than HRE's word (I am not doubting them), does anybody else have verification of this? I am very interested. The ISF's lack of grip due to its weight and power is one thing I would love to improve. 255 fronts and 295 rears sound AWESOME!!!

DoubleXL, did HRE say that the rears fit without rolling the fenders? If so, I will be ordering wider wheels shortly. Also, what were the offsets on the 8.5" fronts and 10.5" rears? Thanks in advance.
 

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good stuff...thanks for the info
 

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Continental ExtremeContact DWS

Hey all,

I think I am going to go have Continental ExtremeContact DWS tires put on my ISF today if I can find a local dealer with the correct sizes. I have two questions:

1) Is there anybody on this site running 245/35R19s front - 275/30R19s rear in an Ultra High Performance All Season tire similar to the ExtremeContact DWS?

2) If so, are there any rubbing issues whatsoever, and how does the dry traction compared to the stock ISF tires?

I know that several people have reported no rubbing on 275/30R19 rears, but I thought that maybe the A/S tires might have a just bit more tread and potentially cause issues. I am pretty sure they will fit, but I don't want to have them installed and have rubbing issues.
 

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For the last 5-6 months I have been running 245/35R19 on the front and 285/30R19 on the rear on stock rims. No rubbing problems. In fact I just finished a track weekend at TWS with this setup and no rubbing whatsoever. Did not have to roll the fenders. Hope this helps

Pat
Thanks A LOT for the confirmation on this. I have been hesitant to pull the trigger on this one, but now I have a little piece of mind.

What exact tire have you been running? I would like to look up the manufacturer's exact specifications on it because the same list size tire can vary in actually specifications between manufacturers and model types.
 

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Well, I ordered Continental ExtremeContact DWS tires online last night - 245/35R19s front and 275/30R19s rear. They should arrive within the next week. As soon as I get them put on the car, I will post pics from every angle. I figured that by going with an ultra high performance all season tire, I would get the best of all worlds without having to switch tires in different seasons.
 

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The tires arrived today, and I am about to go have them installed. As promised, pics will soon follow.
 

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I had the 245/35ZR19 and 275/30ZR19 Continental ExtremeContact DWS tires mounted on the stock rims last night. Everything seems to fit perfectly with no rubbing. I did a little hard cornering...no rubbing. I drove both forward and backward with the wheels locked to either side...no rubbing. Last night is was about 30 degrees where I was. The DWSs have a ton more grip in the cold.

I took several pics at NTB (got them to mount and balance the tires for $25 each). Before anybody comments, just let me say...I know my car is filthy right now, and I am embarrassed to even post pics of it. As soon as it warms up, I will wash it and take better pictures. I just wanted to show everybody how well the 245s and 275s fit.
 

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I went with the Continentals, because they are generally rated as the top all around ultra high performance all season tire, along with the Michelins Pilot Sport A/S. They were MUCH cheaper than the Michelins though.
 

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Have the new tires changed the driving dynamics of the car it looks to me that the tires are a bit to wide for the rims ie is it more loose/tire flex on turn in's ? . Reason i ask is the 255's give the correct side wall stiffness based on wheel width, kindly advise
on the stock rims, 245/35/19 fronts and 275/30/19 rears fit and drive great. You might need to get an alignment (I did) after switching, but there are no problems with tire flex, turn in or anything of that nature. These sizes are the widest advisable tires you can put on the stock rims though.
 

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No, I didn't replace anything regarding the TPMS. I didn't think I would need to. Should I have?
 

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I purchased the tires online, and had NTB install them locally.
 

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An alignment isn't mandatory, but is always a good idea. I got an alignment at the Lexus dealership a week after I had the new tires mounted and balanced, because the car was floaty at 80+ mph. I don't know why, but the toe angles were off on both sides after the tire change, but the camber remained perfect.
 

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I think the stock tires are 26" diameter for the rears and 26.1" for the fronts. 245/35R19s are 25.9", which is very close to stock diameter. 245/40R19s are 26.7" which is definitely taller...I don't know if it would be enough to rub during full steering lock. 275/30R19s are 25.5", while 275/35R19s are 26.5". I imagine both would work fine, but I would think the shorter tires would work better overall. I know for a fact the shorter tires won't rub. Your car should be a tiny bit faster with the shorter tire as well.
 
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