F-Sport AWD models come stock with 19x8 wheels all around. She would have 18's only if they changed out the stock OEM wheels. I believe the best tire sizes in the case of 20's for the 4GS is front: 245/35 and Rears: 275/30. I believe 265 is too wide up front.

Helpful thread: https://www.clublexus.com/forums/gs-...thread-31.html

 

I think maybe he meant model Year 2018?

265 is going to rub in the front, but with AWD, OP should keep the same tire sizes all around on a square set up.

 

 

Honestly even 255 on 20s will probably rub in the front. I don't know of any members who are running bigger than 245 in the front on either 19s or 20s without crazy fender or wheel work.

 

I'd be interested in the stock 19's if you sell them. Thanks

 

Just did a 20x10 square setup on our GS last week. Everything came out great with no rubbing or clearance issues on RSR Super Downs.
https://www.clublexus.com/forums/gs-...-complete.html

 

Hey guys need some help I ordered some raw Bathurst 20x9.5 all around for my 2015 Gs350 f sport will I have any rubbing issues? Can you guys help with site size...? Thanks

 

Currently I'm running a square setup of GSF front wheels on Continental DWS06 255/40/19. No rubbing. Try checking out fitment industries to see what others are running.

 

Hey man, can I trouble you for some pictures please ?

 

Ideal tire size for 20s is probably 245/35 front and 275/30 rear to avoid rubbing.