As the title says, im looking at some 19" formula series.

What width should i run on my Cayman S? 8.5"fr and 10"rear?

 

At least 11" in the back !!

 

I agree...10.5~11" in the rear!

 

wheelenhancement recommends no more than 10.5 in the rear. You'll appreciate the weight savings & tire costs

 

Are you looking for the deeper dish or more contact surface? If you are going for the dish go with 11's if you are going for contact surface than go with 10's and just run the same size tires...then you will be getting the same contact surface without worrying about a pound or two...I dont think you can run 11's without running spacers anyways...which most would object to as well.

 

Run 10.5 with a 285' rear tire! its plenty for the back of that car

 

We recommend a 19x8.5 and 19x11 with a 2.5" lip up front and a 4.5" rear lip

 

which model wheel u lookin at ?

 

I cant see how you can get an 11" rear under a Boxster. Maybe the Cayman has larger rear fenders or more offset. I tried the 19 x 11" from my 997S as an experiment and as you can see, the inside rim touches the shock damper and the outside of the rim protrudes from the body. This is also with Porsche 21mm spacers.

 

11Jx19 in the back with 275/30/19 on it. (Euro style, cause that's where I'm from )

Fenders were widened a little bit. Wouldn't be necessary on a car that is lowered less then mine was.

So if you're mounting 305/25 tires, arches will need to be widened a little bit.

All depends on what you want, and what you want to use to car for ... I'm getting 11x20 on my Cayman with 305/25/20 because I want less aggressive wheels now ... so I'm sticking to normal/regular sizes The Boxster had to be aggressive ...

 

11 for sure

 

Why would you run a 21mm spacer? Thats a very larger spacer..

Whoever built your wheels did not do the right offsets and back spacing if your rubbing on the shock as well as the fenders.

 

3 pics attached. I think you're right. This wheel from my 997S is obviously the wrong offset. I have otherwise run 18" Carrera wheels with the 21mm Porsche spacers and they fit well. As you can see, the diameter is not the problem, just the width!

 

I had 20x11's on my 997s. We also bulid 19x11 and 20x11 for all 997s. We do 19x12 or 20x12 on the 997 C4s and the 997 Turbo.

Here are some pics of 20x11 in the rear on a 997s. You just have the wrong offset on your current wheels.

 

Very Nice! As you mentioned, these are for a 997S. I also have a 986 (the yellow one) and found that the 19" x 11J from the 997S didn't fit the Boxster (even with spacers). I'm sure you could supply a 19" x 11J with the correct offest and clearance for a Boxster fitment. As a matter of interest, could you PM me some pricing and delivery to Australia. Much obliged.