Recently acquired a 2017 IS 350 F-Sport AWD and mod bug has obviously bitten starting with wheels. Inspired by a similar thread over at clubrsx, I combed through the 100+ pages of the Aftermarket Wheel Showcase thread to bring you the below guide. I did my best to focus on sizes and offsets that do NOT rub and do NOT require spacers and/or fender modifications. If I have missed any, please let me know. If I listed something that does rub and/or require fender modifications, please let me know. This is obviously not a definitive guide, but will hopefully save people from having to go through the Wheel Showcase thread to find a size and offset combination that works.

Please don't ask me what will fit. The information below is purely from an already existing thread and not from personal experience.

Stock Wheel Specs:
Front: 18x8 +45 (225/40/18)
Rear: 18x8.5 +50(255/35/18)

Aftermarket sizes with no alterations:
Front:18x8: +35, +40(225/40), +45(225/40)18x8.5: +35(245/40), +38
18x9: +35(265/35)
18x9.5: +30(225/40), +35(265/35)
18x10:
18x10.5:

19x8:
19x8.5: +30(235/35), +32(235/35), +35(245/35), +38(235/35), +43(225/35), +45(235/35)
19x9: +18(225/35), +34(235/35), +35(235/35)
19x9.5: +38(225/35), +45(265/30)
19x10: +38(225/35)
19x10.5:

20x8:
20x8.5: +35(245/30)
20x9: +32(225/30), +35, +38(225/30)
20x9.5:
20x10:
20x10.5:



Rear
18x8:
18x8.5: +35(245/40), +38
18x9:
18x9.5: +30(225/40), +35(265/35), +38(255/35), +40(265/35)
18x10:
18x10.5:

19x8:
19x8.5:
19x9:
19x9.5: +35(255/30), +38(265/35), +38(275/30), +40(265/30), +42(265/30), +45(275/30)
19x10: +25(235/35), +35(235/35), +38(225/35), +38(255/30), +45(265/30)
19x10.5: +32(235/35)

20x8:
20x8.5:
20x9:
20x9.5:
20x10: +40(285/25), +45(255/30)
20x10.5: +45(255/30), +45(255/30), +45(275/30)


Let me know if you have formatting suggestions to make it easier to read and/or more informative.

 

I think it's a good idea you have here, but i see several caveats coming to mind.
For instance, there are some rim fitments on the list that would never actually fit with a proper size tire, but did because the tire is unsafety stretched...i.e. 19x10: +25(235/35), +35(235/35), +38(225/35)...and that's only one example.
Also some of the Front fitments could be on IS250, which have the smaller brake calipers that will pretty much accommodate any reasonable fitting rim out there...which is not an accurate reflection of the entire IS lineup...i.e. 19x8.5: +43(225/35), +45(235/35)
Additionally rim spoke design also plays a huge factor...one 20x8.5 +35 could fit perfect on the front, and another 20x8.5 +35 will hit the caliper. Spacers are sometimes not for looks, but necessity.
Personally I had 20x8.5 +35 235/30/20 on the front and rear (which isn't on the list, but in the Aftermarket wheel thread)...but I did use a 6mm spacer on the front as the spoke wouldn't clear the caliper...but that was a spoke issue that could be a non-issue on another rim.
Now i run 18x8.5 +35 235/40/18 and 18x9.5 +38 265/35/18 (which isn't on the list, but in the Aftermarket wheel thread) and the front doesn't need a spacer, despite the rim appearing to look the same as the 20's I had, but the spoke curvature is just slightly more, enough to clear the caliper.

 

As someone who's been asking a bunch of questions, I also spent a bunch of time trying to find all the right info.
It might work better to set up a google form instead and have people input all the relevant information themselves.
I'm guessing it would look something like

Year/Model/Trim/Suspension/Wheel/Tire/Fitment/Fitment Mods/Build Thread

Once the data is there, it's then a matter of marking the outliers that you bring up to indicate the unsafe configurations.

Thoughts?

 

Fair points. There are definitely unsafe tire fitments due to stretching like you mentioned. Other factors like brake caliper fitment and such weren't taken into consideration because like you mentioned, this differs from wheel model to model. I think the idea was to provide a good enough starting place that will hopefully save people research time.
For your 18" setup, are you running into rubbing issues at all? I'm planning on running 18s as well and trying to go as wide as possible without rubbing.

 

https://www.fitmentindustries.com/wh...rt=date&page=1 exists, but would obviously require people to sign up and fill out. A google form is something I considered. If there is enough interest, I'll create one.

 

That's where I'm currently shopping atm haha, they have a great system going where it's a great skeleton to plug into, but like you said it requires using their site.

​The specificity of clublexus is the real value imo.
Kudos for putting this together!

 

No rubbing issues with my 18 inch staggered setup...and I'm lowered on RSR Downs.
I rarely have passengers in the back though...mostly it's driver, or driver and front passenger...but even over railway tracks still no issues.
However, the Firestone Firehawk Indy 500 tires I have are a narrow fitment compared to other tires...so there is that to consider as well.

You can run a square 18x9.5 +38 if you like too...with 255/35/18 tires.

In terms of model fitment, there is basically two IS's:

• 2014-15 IS250
• 2014-20 IS-all (except IS250)

Trim package nor engine/driveline configuration will make a difference.
And any rim that will fit the second one above will fit the first, but not the other way around.

I think to make the info self serve it would have to include the rim along with the specs and tires.
Example: If the list says 18x8.5 +35 square with 255/35/18 will fit, and then I go buy any rim that ESR makes, only the front will fit an IS250, and the rear will fit any IS. But you could get the same spec rim in a TE37 and it will any IS on the front and rear.
The list almost needs to be arranged by rim make/model first, then the spec under it that fits the front with tire size, and then the rear with tire size.