Hello
Is there a website that provides wheel and tire offsets for various Porsches?

E.g. would 2015 Cayman GTS wheels fit on 992 S?

 

My Cayman has 235's front 265 rear which is much narrower than what you are running not sure you want to do that. My 991.1 is running 245 front 305 rear. I imagine yours would be similar

 

Aside from width, the bigger issues would be the height of the tires. A 992's tires are F: 26.75" tall and R: 28.2" tall or a difference of 1.5". A Cayman's tires are F: 26.5" and R: 27.3" tall (difference of .8"). So you'd have to seriously upsize the profile of the rear tires to make it work and you probably wouldn't be able to get anywhere close to a 305 width rear tire on a Cayman rear rim that is designed to take a 265 width rear tire.

 

Thanks guys!

 

If you ever need to compare, choose your cars to compare here
https://www.wheel-size.com/size/pors...0/#region-usdm