I have searched all my usual sites to check the back spacing on the factory 19" wheels, and come up empty. Can anyone help me? I believe the front wheels are 8" wide while the rears are 9" wide? Am I correct? But I need to know what the back spacing is.

 

According to this website they are 8.5 and 9.5. The offset is only listed for IS300h

https://www.wheel-size.com/size/lexus/is/2021/

 

I believe the backspacing is +45mm for the front, and +60mm on the back.

 

Thats the site I usually go to myself, but it doesn't show anything above 8.5" for the rear actually.

 

You need to click on the red + to expand for more sizes

 

^^^^^^^^^^

 

Got it, Thank you! Now I need to confirm the offset and I'm set.

 

I’ll leave this right here

I’ll leave this right here

 

I think you want this thread: https://www.clublexus.com/forums/is-...usive-166.html

As cool as your pics are, they actually don't add any value to this thread...no specs of the wheels in the pics and no mention of the specs of the stock wheels...which is what the thread is actually focused on.
Or am I missing something?

 

Oh im sorry.. here's value to your thread....
stock are +45 front and +60 rear for stocks

aftermarket are 20x9 +35 and 20x10.5 +45

enjoy... and i hope that helps as far as clearance...

added bonus.. tire size

275/30/20 rear
and 235/30/20

 

That's what I'm talking about...thanks for all the info...I'm sure it will be valuable to the OP when selecting wheels.

Any issues with the vehicle based on the difference in tire sizes front to rear?
The rear is 4 sizes larger...i can see an AWD IS having issues with this...warning messages can pop with rear tires even 2 sizes larger.

 

This is very helpful, thank you!

 

no issues no rubbing whatsoever. Airs out completely fine. I even put a 5mm spacer up front just to check clearance to push that offset to +30 and it was still good. So you may be able to get away with a 20x9.5 up front on a +35

 

I was thinking more about the safety systems in the car...like the ABS, TRAC, VSC, etc...if any of them was having an issue with the difference in front to rear tire sizes.

 

I have a 14 awd with the same rear rim specs. My car is on springs & 275 won't work on the rear, do you know what rear tire I should run? Thanks.