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What size do you want to run? 17, 18, 19" What are you looking for? Looks? Performance?

 

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19", 20", 21" IS-F wheels

 

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Does anybody know what the stock offsets are on the F? This seems to be pretty difficult information to get. I don't know why I can't find it anywhere in Lexus's specs.

Lou

Our system says the factory specs are as follows:

Front-19x8 et 45
Rear -19x9 et 55

 

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do you know whats the best fittment for aftermarket rims? I'm wishing to go with 20" but it wouldnt hurt to know whats 19"and 20" both.

front 19x9 et?
rear 19x10 et?

front 20x9 et?
rear 20x10 et?


or is there any other better suggestions? please let me know. thanks!!!

Our fitment guide is a little more conservative. We suggest the following:

Front(9") - 40mm to 46mm
Rear(10") - 50mm to 65mm


I agree with FCchampOH on the tire sizes.

F-245/40-19
R-275/35-19


F-245/35/20
R-275/30/20

 

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I disagree with you both on the tire sizes. Using those sizes will increase the OD by an inch and throw off the speedometer. To maintain the stock height, go with 245/35/19 and 275/30/19. When my OEMs go, I'm thinking about going with 235/40/19 and 265/35/19 on the stock wheels. A little bigger in diameter, but not enough to really matter, IMO. However, there seems to little room in front, and I'm reluctant to going any wider than 235 in cross section. Also, at this point in time, there doesn't seem to be a good solution (read selection) as far as tire brands and models for the two sizes I have in mind.

Lou

The sizes you list are certainly the closest to OE rolling diameter. I can tell you that a 19x9 with a 45mm offset will not rub on the front running a 255/35-19. On the rear, 19x10.5 with a 60mm offset will not rub with 295/30-19. Some people prefer a tire with a little more meat on the sidewall. Anything below 3% is acceptable on the IS-F.

 

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Holy Crap!!! You don't even know how much searching I have been doing to try and find someone who will verify which offsets on these wheel sizes will clear those exact tire sizes. I guess I didn't look back far enough.

I called HRE today to try and figure out what they recommend. They recommended those same sizes, but said that the exact wheel backspacing was proprietary information and would not be given out.

When you said that these sizes won't rub, did you test them under extreme cornering with max body roll? Also, if I went with a coilover setup later that lowered the ISF by about an inch, would these sizes still clear without any rubbing?

Our fitment recommendations come from actual measurements taken from the F. Our fitments are also a little conservative so you should not experience any rubbing even under hard use.

 

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No sweat. If we can be of further assistance please feel free to give us a call at 1.888.459.4080.

 

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Will a 285 clear in the rear if i'm on coils? i have less than a pinky gap all around as it currently sits, tucked in the rear

You could but you would need an aftermarket wheel. Your stock wheels are too narrow for a 285 and the offset may be to high for that wide of a tire.

 

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Will these sized tires and wheels still fit without rubbing if a coilover suspension is used, lowering the car by an inch or less?

The rear will be a little tight as it is at the maximum fitment but you should be able to make it work. I suggest running a tire that runs a little smaller in size when compared to other brands. Just like shoes, tires can run larger or smaller in the same size.

 

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Given that most of us who are considering upgrading wheels/tires will run a drop, what offset do you recommend so that we don't rub? I would assume all of us are either rolling or cutting our rear fenders...
Peter

That depends on the use and tire set-up. Below is a quick referrance guide you can use.

FRONT
WHEEL WIDTH OFFSETS WIDTH OF TIRE
7.0 +16/+65 225
7.5 +22/+65 225/235
8.0 +29/+59 225/235/245
8.5 +35/+52 235/245/255
9.0 +41/+46 245/255/265

REAR
WHEEL WIDTH OFFSETS WIDTH OF TIRE
8.0 +26/+65 225/235/245
8.5 +33/+65 235/245/255
9.0 +39/+65 245/255/265
9.5 +45/+65 255/265/275
10.0 +52/+65 265/275/285
10.5 +58/+60 275/285/295

**USING WHEEL WITH OFFSETS HIGHER OR LOWER THAN SEEN
ABOVE COULD CAUSE INTERFERENCE WITH THE FENDERWELL
OR SUSPENSION COMPONENTS.

 

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So just to make sure I'm clear.....can I run the following without rubbing (assuming rear rolled fenders):

19x8.5f (+42 offset) with 245/35/19
19x10.5r (+59 offset) with 285/30/19

Peter

Edit:
Peter you are on the right track,

Wheel widths and offsets look good.

As for your tires, Yes the 245/35R19 and 285/30R19 would be great sizes to run.

Now that you are this far I would recommend calling the wheel manufacturer and asking them if the wheels you want will clear the brakes on your F. (We can do this for you if you would like.)

Lastly, PM us what you want and we'll be happy to see if we can get you the best price on it. We would love to earn your business.

-Travis

 

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Travis

I believe you're wrong and Peter is correct. 245/40/19 and 285/35/19 are too tall (1" larger in OD than the stock 225/40/19 and 255/35/19). 245/35/19 and 285/30/19 are the same OD and are spot on with the height of the stockers.

Lou

Good catch Lou, Sorry about that Peter. I got my numbers all screwed up there I must have been looking at 18" tires for you and writing 19's. I have edited my last post.

 

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These will be tight for sure. It looks like you may need to roll the fenders in the front and the rear. These offsets are aggressive for your F.

 

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So on stock rims would Front: 235/35/19 and Rear: 265/30/19 be ok? or would we need the same sidewall size as the OEM tires?

The sizes you listed will fit on your factory wheels but I do not see any matching tire sets available with the correct load index for your F. You should look into running size 245/35-19 in the front and size 275/30-19 in the rear.

 

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Like previously mentioned, the 235/35-19 and 265/30-19 sizes work on your factory wheels but most matching tire sets in this size do not have the correct load index for your IS-F. The stock load index in the front is 93XL and the stock load index in the rear is 96XL. The Invo in size 235/35-19 has a 91XL load index and the 265/30-19 Invo has a 93XL load index. We do not recommend running a tire with a lower load rating than what comes factory.

 

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^
With the Eibach Pro Kit springs installed (0.7" front - 0.3" rear), tire sizes 245/35-19 and 275/30-19 will work great.

 

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^
The front will be tight but shouldn't need any modifications if you stick with a tire model that runs smaller in size. Tires are just like shoes, some brands run larger than others even in the same size.

The rear is aggressive and will require a roll or neg. camber.

 

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^
Thank you for your support and yes, Hankook tires typically run smaller in size.

 

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^
Fitment looks solid from my end.