Pics of my C4 Sport Design 11.5" wheels on Boxster!

[Supra-P!G]

Originally Posted by The Radium King

cool - 38 mm spacers - what is the original offset of the wheel?

perhaps a mild roll of the fenders will help w the outside rubbing.

i like that you were able to fit them without having to go to narrow rubber.

what is your rear camber and ride height?

for parking brake cables, there is an oem clip for that purpose, sold for the * i think * 996 turbo, but damned if i can find the part # right now.

My original calculations (from another post):

Front 205/50/17 on a 7 inch wheel with 55 offset.

Rear 255/40/17 on an 8.5 inch wheel with 50 offset.

If want to install the 911 Sport Design wheels:

Front 235/35/19 on an 8.5 inch wheel with 55 offset = +19 mm inside, and +19 mm outside increase.

Rear 305/30/19 on an 11.5 inch wheel with 67 offset = +57 mm inside and +19 mm outside

I assume that front might be okay, but I should install at least a 7 or 10 mm spacer.

For the rear I need at least 1.5 inch spacer that will leave (38mm - 57mm) about 19 mm closer to the strut.

My question is, can I use the size spacers as I've selected, or do I need to go bigger?

"

These are 6 mm closer to the strut than original rear wheels.

They are supposed to be 1.2 inches taller, but they are actually only 1/2 inch taller. The car is barely any taller, and my speedo is still off in the other direction. So, 80 mph is 79 actual speed.

[The Radium King]

Originally Posted by Supra-P!G

My original calculations (from another post):

Front 205/50/17 on a 7 inch wheel with 55 offset.

Rear 255/40/17 on an 8.5 inch wheel with 50 offset.

If want to install the 911 Sport Design wheels:

Front 235/35/19 on an 8.5 inch wheel with 55 offset = +19 mm inside, and +19 mm outside increase.

Rear 305/30/19 on an 11.5 inch wheel with 67 offset = +57 mm inside and +19 mm outside

I assume that front might be okay, but I should install at least a 7 or 10 mm spacer.

For the rear I need at least 1.5 inch spacer that will leave (38mm - 57mm) about 19 mm closer to the strut.

My question is, can I use the size spacers as I've selected, or do I need to go bigger?

"

These are 6 mm closer to the strut than original rear wheels.

ok, so on the rear you are at 67 - 38 = 29 offset w an 11.5" wheel. i am running a 40 offset w a 10" wheel. i got not much space between my wheel and my coilover, and not much space between my wheel and my fender lip (on a 275 wide tire).

difference in wheel width is 1.5" = .75" on each side = 19 mm wider on each side, but you are pushed out an additional 40-29 = 11 mm, which makes you 19 - 11 = 8 mm closer to the strut than me. i truly think i could not get 8 mm closer to my strut. my conclusion is that this is probably only possible with a 19" wheel which moves the inner lip 1/2" up and further away from the strut than an 18" wheel does.

on the outside, your wheel is 19 + 11 = 30 mm / 1.25" further out than me. i've got -2 camber on the back and couldn't fit an additional 1.25", so fitment would require more camber than i got (which appears to be the case in your photos) and prolly some rolling of the fenders (which appears to be the case in your situation).

good data points; thanks very much. 11" wheels are much easier to find, good to know how they can be made to fit.