Tires & Rims Question
 

Hi guys i am new to the site and i need your help...!!

I have a 2003 boxster based...
i want to change my rims to 19's i like to put the following

19x8.5 42mm offset ( 235/35/19) fronts... do i need spacers? if so what size ?
19x10 58mm offset (275/35/19) rear....do i need sapcers ? if so what size ?

if this is possible please give me your input....thanks !

^ second this guy, I just joined the site and need help finding rims and finding the correct tire size.

I'll post my question elsewhere but I have another question for here, would spacers reduce reliability and performance?

flete25

I went digging around the forum, I found this post:

I don't know much about rims, can anyone help me understand how to use the calculator? And what dimensions I should look for with a 986?

FYI: I'm lurking through this post to find some nice rims I want that would replace the honeycomb design I'm looking for, without much luck

I have responded to questions extensively on this forum regarding wheel fitment. What specifically are you trying to accomplish ?

A link to a thread I should read please. I try to find older threads but might not be searching the right terms.

Wheel Clearance
 

What about specifics for the 986, the backspacing, offset, and width allowed.

http://986forum.com/forums/uploads01...1387868571.jpg

I'm sorry I didn't note where this came from, but it shows what Porsche thinks will fit a 986. Obviously, there are other wheels that can work, but this is the baseline.

The 3mm rim offset difference, does that really make a difference?

Also, wouldn't wider tires be better for performance?

I believe I read the limits on a 10 x 18 tire would be 295 / xx / 18. Anyone to verify that?

Would that wide of a tire be detrimental to performance?

Depending upon how aggressive you want your fitment to be, as well as what your suspension set-up is, here's a basic outline to follow:

Fronts:

8 inches wide = offsets ranging beginning with +40 to +35

8.5 inches wide = offsets ranging from +45 to +40 or so.


Rears:

9.5 inches wide = offsets ranging from +40 to +35

10 inches wide = offsets ranging from +45 to +40 or so.

Again, these are based on a number of fitments that I have experiment with personally, and fitment between vehicles can vary based on suspension set-up, tire size and application of use.

danger : your are right on the money with your info...i have done alot research and it all comes back to what you just described...!!