6speedLex

I have a 2007 is250 RWD. 2016 F sport staggered wheels. on the front 18x8 which would be better, a 225/40/18 or 235/40/18. I am not lowering my car, and prefer a meaty tire. Id like the side wall to be somewhat flush. i currently have 215/40/18 and Its not enough tire. What do you guys recommend? pics of yours would be appreciated.

primavera

Depending on what kind of tires you prefer on your car. Summer Performance tires tend to have stiffer sidewalls, and while improving handling they reduce comfort at the same time.
They also have more of the squarish look and have bigger tread width.
All season tires are less square (or more rounded) will have a smaller tread width, with that in mind will give a little more clearance and more comfort.
I myself prefer so called "Touring Tires" or "All Season Performance Tires" produced for luxurious vehicles which are somewhat a combination of comfort and performance with no harm to your back, minus the hefty price tag.
Continental ExtremeContact DWS 06, Continental ContiProContact, Pirelli Cinturato P7 All Season Plus, Pirelli P Zero All Season Plus, Pirelli P Zero Nero All Season, Michelin Premier A/S just to name the few. If you prefer a meaty tire then go with 235/40/18.
You can see how 225/40 look like here:
https://tyrestretch.com/8.0-225-40-R18/

bbaugher47

^^ what a cool frickin site^^^ just saved to my favorites.

triple7is

I'm also debating whether to go with 225 or 235 also. From what I have seen the 235 definitely would work our IS, however the improvement in terms of beefy tire is very little. I used a tire calculator and its a .2 inches thicker sidewall. and .3 inches overall diameter. The pro of have a 235 over 225 is probably you gain more traction from the slightly wider tires. This is just my opinion. If the price is close for the 235 or 225 I would def go with 235 however for me the hankook v12 ventus evo2 price difference is slightly more than i would like.

Rezno

iTrader: (1)

Stock is 225/40 if I remember correctly. I don't think 235/40 will make too big of a difference but it will probably improve front traction a little bit. If the tire isn't much more expensive go for the 235/40. If you're not lowering, both will fit just fine.

sktn77a

iTrader: (2)

I have 235s on my 2008 IS250. Don't know if the 2016 F sport wheels have the same offset. Some 235s rub on the IS250 but most don't.

projectdna

iTrader: (56)

225/40-18 is the OEM 18" tire size. if you want to go with a 235, try 235/35-18. 235/40-18 is too tall.

sktn77a

iTrader: (2)

Yes, they are taller, but not significantly so:

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
225/40-18 3.5in 12.5in 25.1in 78.8in 804 0.0%
235/40-18 3.7in 12.7in 25.4in 79.8in 794 1.3%