So I have a friend that will give me his Bridgestone tires dirt cheap, basically brand new, but they are front: 225/40/18 and rear: 255/35/18. Will this work for my IS350 staggered wheel setup? Thanks!

 

yes it will work

stock setup is
Front: 225/40/18 88Y
Rear: 255/40/18 95Y

 

It will look and feel okay though?

 

Tire Size Comparison
Specification Sidewall Radius Diameter Circumference Revs/km Difference
255/40-18 102mm 331mm 661mm 2077mm 481 0.0%
255/35-18 89mm 318mm 636mm 1997mm 501 -3.9%

Your side wall on the rear will be 1/2 an inch thinner.
It will actually look a bit more even compared to the front.

It's really not that big a difference, the speed/distance on the cluster is calculated by all four wheels on our cars.

As for feel? being that the difference is not that large, you probably will feel more of difference coming from the tire brand/tread difference, not the dimensions.

please check this thread out.
https://www.clublexus.com/forums/is-...5-40-18-a.html