OutlawTita

iTrader: (1)

How much difference will I notice in ride comfort between riding on 235/45/17 vs 245/40/18 tires and wheels?

I have some aftermarket 17" wheels that have never fit perfectly even with spacers. They are just too sensitive to any misalignment and almost impossible to keep properly balanced. I am getting ready to buy some OEM 18" Lexus GS430 wheels for my GS400 in order to hopefully eliminate this balancing issue and get a better fit. I am just wondering how much ride comfort I will be giving up for this swap.....to me personally I don't really want to swap ride comfort for cornering ability and looks but I am tired of dealing with my balancing issues with wheels that don't fit properly.

I am hoping that overall I will be better off with the OEM 18's than 17's that don't get the job done.

Infamous 1

iTrader: (20)

18s with those tires will ride pretty smooth. Probably won't even notice the difference.

GSteg

iTrader: (15)

The difference is negligeble. Tires has more to do with ride quality at those wheel size. You can still have a decent amount of sidewalls with 18s.

Sonic_RC

iTrader: (15)

it will still be very confortable with 18's

werewolf

I have 245/40/18 up front on my other car. Ride quality is ok but you need a tire with good sidewalls if you have potholes and such.