17x8 +35 17x9 +40 Fitment - Lexus IS Forum
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post #1 of 35 (permalink) Old 10-07-2018, 04:39 AM Thread Starter
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17x8 +35 17x9 +40 Fitment

Hello, new is300 owner here. I looking for some new wheels in the next few months. The front wheels after using the offset calculator is at 66.6 which is more than 65 which is 1.6 past the fender. The rear is at 74.2 which is more than 68. I’m planning to use 215/45R17 front and 245/40R17 rear. Any real world experiences with running this setup? Do I need a roll or can I get away with trimming? I’m not lowered yet, but planning to lower the car at least an inch on cxracing coilovers.
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post #2 of 35 (permalink) Old 10-07-2018, 06:44 AM
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Should work. You should roll the fenders and quarters.
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post #3 of 35 (permalink) Old 10-07-2018, 09:09 PM Thread Starter
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Does anyone have pics of the wheels similar to what I posted? I searched but seem to only find stanced IS300. I’m looking to run a somewhat conservative offset for my daily is300.
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post #4 of 35 (permalink) Old 10-07-2018, 09:11 PM Thread Starter
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I currently have ASA AR1 17x7 +47 and 17x8 +45 rear. Way too weak on the is300.
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post #5 of 35 (permalink) Old 10-07-2018, 09:13 PM Thread Starter
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Unless I go 17x8 +35 all around. Using 215/45R17 front and 245/40R17 in the rear?
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post #6 of 35 (permalink) Old 10-10-2018, 11:08 AM
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I wouldn't run a 245/40R17 on the back, especially with a 17x8 wheel - on a x8 it will look pretty pudgy.

A 225/45R17 and 245/40R17 are a better match if you want to increase your overall diameter. 235/40R17 is going to be the stock diameter of tire which will work well with your speedometer (since 215/45R17 is a stock size tire).

02' MT w/MK3 Supra LSD and no sunroof
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post #7 of 35 (permalink) Old 10-18-2018, 01:26 PM
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I run something similar to what you are trying to do. 17x8 up front & 17x9 out back Kosei KS-1s. +35 offset and a 245/40 tire on all four. Lowered on coils, fenders are rolled.

Has worked well for the most part even on track days /auto-X. I would prefer a squared setup next time.

[IMG]IMG_0726 by Carlos Carbonell, on Flickr[/IMG]

[IMG]IMAG0530 by Carlos Carbonell, on Flickr[/IMG]
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post #8 of 35 (permalink) Old 10-18-2018, 02:19 PM
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Originally Posted by carbonell View Post
I would prefer a squared setup next time.
Why do you say this? just curious. Your tires are already all the same.
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post #9 of 35 (permalink) Old 10-22-2018, 08:26 AM
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He probably means a squared wheel setup. He's 17x8 and 17x9 right now.

02' MT w/MK3 Supra LSD and no sunroof
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post #10 of 35 (permalink) Old 10-22-2018, 01:08 PM
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Originally Posted by TobiasSing View Post
Why do you say this? just curious. Your tires are already all the same.
I like the look better of the 17x9.
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post #11 of 35 (permalink) Old 10-22-2018, 02:08 PM
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Ah that makes more sense. The way it was stated, sounded like you wanted the square setup for the track. But it's just for looks. I can't tell the difference between the front and back anyway, they look the same to me. My winter wheels are squared, just the back is offset 15 more mm
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post #12 of 35 (permalink) Old 10-22-2018, 04:50 PM
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Quote:
Originally Posted by TobiasSing View Post
Ah that makes more sense. The way it was stated, sounded like you wanted the square setup for the track. But it's just for looks. I can't tell the difference between the front and back anyway, they look the same to me. My winter wheels are squared, just the back is offset 15 more mm
i know you didnt ask me, but ill chime in. i specifically went square so i could have the same exact face type and look through out all 4 corners. it drives me nuts when i see aggressive faced concaved wheels in the rear and i can tell they're staggered because the front has a weaker face profile. dished stagger is fine for me as long as the front lip isnt like 2" and the rear is 5" (i see this a lot in newer euro cars).

i also planned to buy 2 battles that are +1mm higher offset (close enough) for spares eventually; since i have the same spec all around those battles can go on the front or rear without a problem and im already setup for that in all 4 corners. just makes life easier.

one other small plus is tire sizes. while its not hard to find different sizes, im cheap and am constantly looking for deals on the specific tire brand/size i like. my tires only last 5-6k miles on a side before they need to be flipped (no sense in buying pricey rubbers IMO, just need something that stretches good). it just makes it easier when i need 1 tire size versus 2.

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post #13 of 35 (permalink) Old 10-23-2018, 02:17 PM
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yeah I totally agree with you on all your points. Only reason I'm staggered is because the body of the car requires it for an even look, unless using spacers. My winter wheels, since they are the same width, need 15+ more offset in the back, which gives more of that weird concavity difference, vs my staggered summers, which use width to fill in rather than offset. It makes things a little more annoying when it comes to tires and rotation, but nothing problematic. Then again, I'm not cheap lol, and I don't do stretched setups. So I just redo all the tires at once
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post #14 of 35 (permalink) Old 02-24-2019, 02:28 PM
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I was curious how the 17x8 +35 fills the front out as well. I'm planning on a 17x8 in the front with either a +34 or +36 offset. I'll be mounting a 235/40/17 which I'm hoping will have a similar profile to my rear which is a 255/40/17.
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post #15 of 35 (permalink) Old 02-27-2019, 06:01 PM
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Quote:
Originally Posted by RSV4_chic View Post
I was curious how the 17x8 +35 fills the front out as well. I'm planning on a 17x8 in the front with either a +34 or +36 offset. I'll be mounting a 235/40/17 which I'm hoping will have a similar profile to my rear which is a 255/40/17.
Do you know if 17x9 +45 255/40R17 will work all around?
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