17x8 +35 17x9 +40 Fitment - Page 3 - Lexus IS Forum
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post #31 of 35 (permalink) Old 05-07-2019, 10:56 AM
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Originally Posted by black86 View Post
diameter of the wheel matters more for suspension clearance where the barrel of the inner rim rests in relation to the knuckle. 17 sits lower and closer to the knuckle's curve towards the hub. I agree with you, it's a good guide but in the end it's trial or error. it's not 'harder' just more work when you want to run 17s, 9 wide and have to consider the knuckle clearance with barrel design as well as clearing the supra calipers and spoke design. I also don't want to run a spacer it's easier to go 18s but 17s are lighter and preferred for my application. thanks tho for your input!

what size wheels are you running with 9.5 wide up front? offset? and tire size? just wondering 😊

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im not sure i agree with you on the part i bolded. take a look at the picture of my spindle:
https://c1.staticflickr.com/5/4798/4...fe7e8738_b.jpg

at a difference of a 1/2" at the top, i would actually argue that fitting 18s are harder because your wheel is now 1/2" closer to the upper pick up point on the spindle. its pretty damn close for my 18s, im not sure i could go up another tire size and it still clear the balljoint shank. a 17x9 +20 will have the same exact inner barrel location as a 18x9 +20; the 18" being a 1/2" higher up. 17 and 18" barrels sit right around the braced portion on my spindle. so its kind of a moot point to me, IMO.

honestly, if i started to run 17s, id be more concerned about ground clearance then spindle clearance. im currently on 18x9.5 +22. tires are NS20s (225/35/18)

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Last edited by mesooohoppy; 05-07-2019 at 11:08 AM.
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post #32 of 35 (permalink) Old 05-08-2019, 12:47 PM
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Originally Posted by mesooohoppy View Post

at a difference of a 1/2" at the top, i would actually argue that fitting 18s are harder because your wheel is now 1/2" closer to the upper pick up point on the spindle. its pretty damn close for my 18s, im not sure i could go up another tire size and it still clear the balljoint shank. a 17x9 +20 will have the same exact inner barrel location as a 18x9 +20; the 18" being a 1/2" higher up. 17 and 18" barrels sit right around the braced portion on my spindle. so its kind of a moot point to me, IMO.
You also have cut spindles though, so that's why you're almost hitting the upper balljoint on the front. Most people will only have issues with inner spindle clearance with high +35/40mm offsets.

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post #33 of 35 (permalink) Old 05-08-2019, 03:10 PM
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good point. although my main point still stands: it is not any 'harder' to fit a 17 than it is an 18 inch wheel when talking about inner barrel clearance. its a 1/2 inch difference. if you look at an unmolested spindle, the general inner barrel clearance in that area of the spindle is the same over a half inch area (or very very close). things like wheel width, offset and tire size are much more critical when talking in this context over 17/18 diameter clearance.

edit:
further building on your short spindle comment. you could argue that fitting 17s would actually 'easier' when discussing the upper balljoint clearance. which would allow you to run an even shorter spindle, or a slightly bigger tire size.

i would have loved to have had my spindles shortened 35 or 40mm, but i couldnt because i specifically had 18s (so i had to 'settle' for 30mm). i could have possibly gotten away with 35mm, but it would have been insanely close and i would have been married to a certain tire size until i change wheels.

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Last edited by mesooohoppy; 05-08-2019 at 03:20 PM.
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post #34 of 35 (permalink) Old 05-09-2019, 08:21 AM
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17x9 +35 test fit.

5mm clearance to inner spindle and 5mm clearance to supra caliper. any closer and I wouldn't be comfortable tracking it.

I had similar fitment with 17x9 +38 but those were forged monoblock wheels and at the time I had stock calipers. the test fit is a low pressure cast with flow forming (forged barrel) if it were a full low pressure or gravity cast wheel it may be closer to the inner spindle

regarding outter fender clearance, I would either have to 1) run more camber than -3.3 but no more than -3.6 2) raise the car 15mm 3) raise spring rates 4) run something closer to a tread width of 8.4" vs the idea 8.6 - 8.8" but a diameter under 25"

since I want as much contact patch as possible I'll be raising it 15mm and going from 16k/9k to 18k/12k. depending on tire manufacturer, tread width of 8.6-8.8" can vary from 235/40, 245/40 or 255/40 just need to research the specs.

if anyone is interested, tire rack is closing out on their 6/32 tread depth stock of a052

https://www.tirerack.com/tires/tires...%28Original%29

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post #35 of 35 (permalink) Old 05-09-2019, 09:12 AM
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awesome. sounds like youve got it figured out!

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