Should I run 35 profile tires?

From a personal perspective, I'd say on an 18" wheel, try to stay with a 40 series or higher. On a 19+, a 35 series should be alright. Keep in mind as someone else mentioned that actual sidewall height varies by manufacturer, especially with a drag radial.

I have 40 series tires on 18's, and I really didn't notice much of a ride difference v.s. the 50/55 series on the ponies.

sidewall also varies based on the width of the tire.
I think that the sidewall (profile) number is a percent of the width of the tire, the
a 225/35/18 will not have the same overall diameter as a 275/35/18.
This is why you see guys running 235/40/18's front and 275/35/18's on their cars. Overall diameter of the tire is roughly the same even though the profile numbers are different.

By the way the tire combo denoted above is what I run on mine. I noticed a little stiffer ride, but that is outweighed greatly by the increased handling ability of the car. It should also be noted that I went from H rated tires to Z rated tires.

The wife has 245/30-20 BfGoodrich KDW's on her G6. They dont ride to bad. Potholes are a little more noticeable but nothing terrible. 35s would of rode a little bit better but the 30s were closer to the factory tire height and I wanted to be sure there wouldnt be any clearance issues when we changed the suspension. A Jaguar on some 20s would look pretty mean!!
View attachment 330270

I think it will really come down to the actuall tire sidwall rating...

my ride quality went down big time when I put polyurethane bushings and FRPP C springs in my car, regardless of the 60 series tire I run.

I run Nitto 555's on my car. I have 35 series on the front and back. Ride is just fine. I did not notice any difference when I went to the 18's from the 17's. I had 45 series on the 17's.

fasterdamitt said:

I want to thank everyone for the input. I just ordered staggered TSW Indy 500 wheels 19x8 and 19x9.5
Yokohama S-Drve tires
Front 245-40-19
Rear 255-40-19
I'll post up pics later in the week when they are on.

Thanks again.

Click to expand...

Good choice. Rims bend easily. I keep forgetting that the Jag is a Ford but soon to be a TaTa elephant machine from India.