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Old 07-15-2017, 05:57 AM   #1
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Wheel Fitment and Spacers

Just got bit by the AX bug earlier this year and I'm trying to improve my times but want to keep my 2004 986 S as stock as possible. I just purchased a set of 17" turbo twists to replace my 18" wheels. The 18's have Michelin all seasons mounted on them and want to keep them on for non track days. So I decided to get track wheels and tires to install for the track.

Existing wheels and tires -
225/40-18 7.5x18 ET50 - Front
265/35-18 9x18 ET52 - Rear

New Wheels and Tires
225/45-17 7x17 ET55 Front
255/40-17 8.5x17 ET50 Rear

I used the following site to determine if the new wheels and tires would fit on my Boxster. Online Wheel and Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit

The results showed they would fit but the chart also mentioned that the outside of the tire would not poke out as far as the existing. 11.4 mm on the fronts and 4.4 mm on the rears.

Would it be advantageous to add 10mm and 5mm spacers to the car? I'm not sure if the track would be wider at that point?

Thanks in advance.
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Old 07-15-2017, 10:37 AM   #2
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Personally, I'd put 15 on the front and 10 on the back. I'm running ET 40 on the back and ET 50 on the front with 10mm spacers. Very planted.
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Old 07-15-2017, 02:23 PM   #3
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I have the exact same setup. I have 15 mm spacers all around and I keep them on permanently for my daily driver 18 in wheels, and for the 17 in track setup.

17 in wheels before and after 15 mm spacers:






You really need 15 mm in the front IMO. You could probably get away with 10 mm in the rear though.
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Old 07-18-2017, 02:48 PM   #4
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I run the same wheel/tire setup and use 12mm front and rear with no poke and no rubbing.
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Old 07-19-2017, 04:26 AM   #5
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Thanks for all of your advice everyone.
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Old 07-19-2017, 06:09 AM   #6
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I have the same as your original set-up with 15mm in the front and 20mm out back, sits nice and square.
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Old 08-05-2017, 02:56 PM   #7
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I've been busy

Just finished my setup for wheels and tires on my 04 S in order to be ready for the next AX.

My starting point was to remove the 18" Michelin AS3 All Season tires to get ready to move to the 17" Turbo Twists.


I wanted to try a different look, so I decided to Plastidip the wheels Black, I wanted a grey but not available when I was shopping.




Added 15 mm spacers to the front and 10 mm spacers to the rear.




I picked up the Falken Azenis RT615K's on special closeout pricing of $400 plus shipping (price has gone up about $10 per tire since I purchased).




Here are the results. I went for a quick run and was pleased with the feel and the handling. Can't wait for the next AX!



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Old 08-19-2017, 05:57 AM   #8
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Where did you find the wheel mounting alignment tools? I had one for my old BMW but can't find ones for the 986.
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Old 08-19-2017, 08:34 AM   #9
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Keep a couple of things in mind when it comes to using spacers on our cars. My tech concurs with me on these thoughts, although some of you physics and engineering guys may disagree...

First, the bigger the spacer the harder it will be on your wheel bearings. New bearings are not expensive to buy ($50 each, but outrageously expensive to replace for labor costs ($400 or more per corner). It's not worth it for a more aggressive look in my opinion.

Second, if your wheel is out of balance spacers can accentuate vibration.

After replacing all four of my wheel bearings, I ditched my 15mm spacers and went with the smallest spacer required for my 18 inch rims to clear the struts (5MM).
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Old 08-21-2017, 05:46 AM   #10
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Quote:
Originally Posted by BrantyB View Post
Where did you find the wheel mounting alignment tools? I had one for my old BMW but can't find ones for the 986.
BrantyB - I'm not sure, I purchased them 4 years ago, I believe it was through Suncoast for approximately $10 each.

Quote:
Originally Posted by RandallNeighbour View Post
Keep a couple of things in mind when it comes to using spacers on our cars. My tech concurs with me on these thoughts, although some of you physics and engineering guys may disagree...

First, the bigger the spacer the harder it will be on your wheel bearings. New bearings are not expensive to buy ($50 each, but outrageously expensive to replace for labor costs ($400 or more per corner). It's not worth it for a more aggressive look in my opinion.

Second, if your wheel is out of balance spacers can accentuate vibration.

After replacing all four of my wheel bearings, I ditched my 15mm spacers and went with the smallest spacer required for my 18 inch rims to clear the struts (5MM).
Randall - I started with 18" wheels on the car originally and went down to 17". I used 10mm spacers on the rear and 15 mm spacers on the front to help with the clearances. The wheels and tires were balanced by my shop and I've not experienced any vibrations while driving both locally and on the interstate.
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Old 08-21-2017, 06:54 AM   #11
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Quote:
Originally Posted by eicheldp View Post
Just finished my setup for wheels and tires on my 04 S in order to be ready for the next AX.
Looks like a well done job. Clean stuff
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Old 08-21-2017, 08:58 AM   #12
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Originally Posted by Nine8Six View Post
Looks like a well done job. Clean stuff
Thanks Fred, I value your opinion.

BTW - I can't wait for your new infotainment system. Put me on the list!
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