what tire are you running? 255 35 isn't made very often

 

probably Michelin Pilot Sport PS2 or Bridgestone Potenza S-03 Pole Position.

 

Every manufacturers section width even if they are labelled the same size, are different. I've seen it vary as much as 1/2 an inch. It's quite crazy but true. IMO a 255 is a little skinny for a 9" wide wheel but its also depends on the manufacturer. You can fit 265/35R18s but you will have to do a little fender modification. not much tho. BTW if you do any fender modifying, i would not "ROLL" them but rather have them "SHAVED" and then touched up with paint. Rolling will cause the paint to flake and you'll be worse off...

 

both excellent choices...

PS2 is the much smoother and quiter than the S03 but the S03 performs a little better.

 

I think the difference is in the way the standard says tyres shold be measured and the tolerances allowed.

I have a feeling that manufacturers are using this to gain 'advantages'; for example, yoko's seem to be a little skinnier than say a bridgestone so it probably has lower mass for better handling and lower energy absorption and better heat dissipation. Whereas the brdigestone might have a larger contact patch (slightly larger) and greater damping of vibrations. In this case the bridgestone will heat up faster and retain heat for longer, this may be for the purposes of working together with their compound or something...

But yes, you confirmed my suspision that different makes have slightly different sizes for the same numbes... anyway, relying on that fact alone (to not rub with your car) is getting a bit risky?

 

definitely, the only sure way is always to slap it on the car, but in order to get an idea nad at least hopes for crossing fingers... all the research prior is crucial.

 

the only real thing you can count on is that the tire heights or rolling radius is gonna be fairly close between manufacturers. they have to be cause auto manufactureres count on this. As with widths go, since they are not consistent, thats why you see auto manufacturers have non aggressive wheel applications (offsets) on their models. Once you swap the OE wheels for aftermarket ones tho, you're on your own.

 

actually they don't have to be... that's why you get the rotations per mile reading.

also with widths many companies have their own r&d that tells them a certain tire shape is beneficial and a certain shouldering provides certain grip and cornering characteristics that they believe the end user may enjoy. since profile and width are all measured at the bulges of the tires this gives manufacturers less accuracy in describing aspects of the tire dimensions.

 

the wheels came in after 3 weeks... for more pics and details CLICK HERE