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Old 12-20-2019, 05:04 PM   #1
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Advice on 18x10 / 18x8 rims and tires for 99 Boxster

Looking at some different rims for my 1999 986. I came across a set of 2003 5 spoke with tires.

The rim sizes are 18x8 front and 18x10 rear
The tires are 225 40 18 fronts & 285 35 18 rears.

I currently have the stock 17" twists installed. With these sizes, would I need spacers and if so, what size?

Would I be better off with smaller tires in the rear? And lastly, would I need to change camber or anything of the sort with wheels this wide?
By the way, just for street driving.

Any ideas?


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Old 12-20-2019, 07:31 PM   #2
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Spacers will depend on the wheel offsets
Standard 18's are 265/35 rears
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Old 12-20-2019, 09:17 PM   #3
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Thanks JayG. For the rears, the wheels are a 65mm offset. I'm thinking 20mm spacer or even 25mm?
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Old 12-21-2019, 11:04 PM   #4
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I have these tires. And I calculated that I needed a 35mm spacers in the back.
There are some calculators online for it.
Can't remember how much in front.

I decided to buy some others and my set is for sale at the moment.

/Kim

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