Michaelc

I'm currently running 997 Carrera III's with 265/35/18 rears. They are Conti's and they look stretched. When they are off the car they have a visible dip in the middle. I'm preparing to replace them and would like to get the correct size tires.

User 122821

several run 285/30/18 on 10" width rims

timothymoffat

By dip do you mean they are worn more in the middle? Possible over-inflation?

That's what I run on my lowered 97 NB that has factory "hollow spokes" (18x10, ET65). No rubbing, even wear. Different tires have different dimensions and "fit" differently despite being the same size.

randytrish

I run 285/30/18 on the same width/offset as yours with no issues and good wear.
Randy

shadow993

I run 285's on my 18x10 with a 65 offset. What is the offset on the 997?

Martin S.

The smaller the aspect %age, let's say you go from a 35 to a 30, the rougher the ride. And when going to new tire sizes the rolling radius front to rear cannot exceed 3%. If it does, your ABS goes crazy and may shut off.

Send me a PM with your e-mail and I'll send you an EXCEL sheet where you can plug in front and rear sizes and calculate their rolling radius.

Michaelc

Thanks for all the advice. The wheels are on my 95 C2 cab, which is lowered and I confess to not knowing the offset of the wheels. I do know they do not rub.

As for the visible dip, it is just that. The treadwear is even across both wheels and the tires look strecthed like they are causing a dip in the center. It's the strangest thing I've ever seen and I wish I had taken a picture.