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Old 05-02-2021, 03:15 PM   #1
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Wheel and Tire Size

I have a 2004 Boxster S with 205/50 R16" on the fronts and 225/50 R16"s on the rears.
I recently purchased a set of 235/40 R18" (8" wide with offset ET57) for the fronts and
265/40 R18" (10.5" wide with offset ET60). I read in an earlier thread that 11" wide rims will not fit on a Boxster. Will 10.5" fit? If so, what size mm spacers will I need for front and back. I have looked at offset calculators but am not sure of exactly where the tires need to be. I also know I will need brake line clips to keep them away from the tires. If they will not fit, I got deal so I will just turn around and sell them, but I would love to make it work.

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Old 05-02-2021, 04:43 PM   #2
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10mm spacers will bring you close to stock. If I remember correctly the stock ET's are 52 front and 50 rear. i will have a new video coming out in a few days explaining all this stuff!
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Old 05-03-2021, 06:28 AM   #3
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Originally Posted by JJJvf161 View Post
I have a 2004 Boxster S with 205/50 R16" on the fronts and 225/50 R16"s on the rears.
I’m wondering how 16” wheels are clearing the brake calipers on an 04S? Everything I read says 17” were the minimum size. Just curious.
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Old 05-03-2021, 06:56 AM   #4
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Your new wheels seem like they are stock for a 996, which have much bigger rear offsets. I believe the closest 10.5" rears are on the 2004 986 Special Edition those have a 42mm offset. You are likely to need some significant rear spacers. You can go to https://www.willtheyfit.com to help with the math.
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Old 05-03-2021, 09:57 PM   #5
Perhaps the worst example
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Here’s a look at 18x10.5 60ET and a 25mm spacer, base suspension—seemed to clear. No promises on that, though. I only have 17’s for the front and didn’t even run it around the block set like this as I wanted to see what stock wheels felt and looked like for clearance on super wide spacers (and it was getting dark already). This was last Thursday and I may throw them back on again for a test and will put any relevant feedback here if I do. I tried to hang that beer as a clinometer vs. the wheel well. Actual results may vary, lol.

If anyone’s run this wheel with the 8.5 up front, I’d love to hear your impression. $900 to make the set whole is a little risky, but I’m perhaps willing to give it a shot in a couple months.
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Old Today, 07:15 AM   #6
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Thanks fellas. My 04 Boxster was originally a standard. I am the 4th owner. The 3rd uploaded a 3.2L after the original 2.7L IMS failed. Where would I get 24mm spacers. 18mm are the biggest I saw on Pelican parts.

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