I need help getting wheels for my new 2021 is 350f sport I want to put 19x9.5 front and 19x9.5 or 19x11 rear just can’t figure out what offset cause no company can’t tell me if I’m gonna have clearance or rubbing issues and I don’t want none of those issues when I get new wheels need help please

 

Welcome to the forum!

As only a few members have rims on their 2021, it looks like so far the fitment is the same as previous years (2014-2020).
If you want a square 19x9.5 setup, then I suggest a +38 offset.
If you want to go staggered, then front 19x9.5 +33 to +38 and rear 19x10.5 +45 to +50.
I'm not sure if you can fit an 11 in the rear...this is considering that you would be getting properly sized tires for the rims.

A consideration that if you are going with 9.5 in the front, it may be better to go with a square setup.

 

Thank you for the advice but can you tell me what’s a square set up I’m kind of new and not familiar with the term thank you 🙏

 

Square setup equals the rims and tires being the same size/specifications at each corner of the vehicle.
This has the benefit of being able to rotate the wheels front to back to even out tire wear.

Staggered is when the rear rims are taller and/or wider than the front...which would also make the tires larger. In the case of the IS, most common is the rear wheel being wider.
With this setup rotation of the wheels front to back is not possible.

 

Thank you 🙏 so much

 

Can you actually fit a 19x9.5 on the front of these cars with stock suspension? If so, what tire size is used?

 

I don't think anyone has done a 19x9.5 on the front...but some have done 18x9.5.
Let's say you ran an 18x9.5 +38 with a 255/35/18 tire (which some currently have on lowered vehicles too)...to go up to 19x9.5 +38 you would drop the tire to 255/30/19 and the overall wheel dimensions would be the same.
Personally I think you could even fit a 265/30/19.

 

Found this one running a pretty large setup - 20x9.5 and 20x11. No mention of offsets used, or the tire sizes, sorry. Different strokes and all that... but the rear doesn't look right to me. I think 11" wide is too much.
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Looks like the rear fender is sitting on the tire...I doubt the car is bagged though.

 

Does anyone have a strut bar installed on the 21 is350F sport? If so where can I get one 🙏 thank you

 

Correct - not bagged, it's on coilovers.

 

You think this set up will fit without any rubbing or clearance issues
19x95 +35
19x10.5 +32


19x9.5 +35
19x10.5 +35

thank you

 

Front will be fine, rear no chance.

 

Thank you I guess I have to keep looking for rear

 

My first question is .. why do you want extra wide wheels? In most cases it will be more expensive, heavier, has more clearance issues, and in most cases will not influence the rim concave or lip size at all compared to a narrower wheel with a lower offset.

Clearance on these cars is 90% tire contact issues. So the 'tire offset' and tire width are most important.

Are you ok with stretching tires? If not then you will need 235s in the front. 235s on a 19 need about +36-38 offset for complete 100% suspension travel to prevent tire from hitting things in the front fender/bumper area (I'm talking at full compression no matter how low your setup, even air). If your not worried about that, you can prob go 30-38 offset. In the front the wheel itself will prob never hit the fender unless you have wide wheels with low offsets and are completely aired out on air suspension.

Rear will take into play tire width/offset first, but also wheel width/offset as the wheel travels deeper into the body on compression. For me a 19x10 +47 with 265s in back had about 1mm of tire clearance and maybe 6mm of wheel clearance when completely aired out (even if you dont have air, this shows you full suspension compression clearance). With an 11in wide wheel you will be running a 275 tire? If thats the case my math says you will need +52 offset or higher (for 100% full travel tire clearance).

So .. considering 100% suspension travel .. then I would say you should be around 19x9.5 +36 with 265s / 19x11 +52 with 275s.

I'm in the process of changing from 19x9 +32 on 235 / 19x10 +47 on 265 ... to 19x9 +34 on 225s / 19x9.5 +45 on 255. (I have AWD so I had to reduce the rear wheel to fit 255s, just so I could get 225s in front for complete aired out clearance and still maintain the correct tire size/width ratio. No tire stretching.)

In my opinion, you want to start with the narrowest tires possible (factory size). Then from there determine the maximum tire offset possible without rubbing under full compression. From there determine the maximum wheel size for the tires allowed.

The vehicle with TE37s definitely has issues in the rear if they actually want the car to be drivable. They'll be adding a camber kit and/or changing tire sizes very soon. They might even have quite a bit of toe out to prevent the tire from contacting the rear bumper/fender area.

Just my opinion, your welcome to yours. My method focuses on factory suspension arms, and total clearance under all conditions including airred out. If you prefer wider set-ups, and rubbing under some more less common conditions .. then you will and can come up with completely different specs. Tire brand, tire wear, and alignment (camber and TOE) can have a effect on clearance.