Just wondering what spacers you guys are able to run with rsr downs. I am about to install rsr downs on my 2016 IS. I currently have 20mm spacers, but I’m not sure if I’ll be able to run those once the car is lowered on the RSR’s. What do you guys have? Or what are the max size that will fit without issues.... I’m guessing it might vary in the front & rear.

 

Assuming you have an F Sport and are running the OEM F Sport wheels, then 20mm front and 15mm rear will fit without issue.
Some are able to squeeze 20mm on the rear, but it really comes down to tire brand and individual vehicle as to if it will rub or not.

 

I also went from stock springs with 20mm spacers to RSR downs with the 20mm spacers.
Stock F sport wheels and tire size.

No issues with rubbing! Looks great, rides great.