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Old 06-19-2019, 05:37 PM   #1
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Tire question...

I just bought a 2004 Boxster and the tires that where installed are:
- Front - 205/50 ZR 17 93W M S (Continental)
- Rear - 255/40 ZR 17 94W M S (Continental)

Is it normal to have different sidewall heights?
Thanks

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Old 06-19-2019, 05:43 PM   #2
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Yes, that is normal. Those are the stock tire sizes.

It is common for many owners to install a 225/45 on the front to reduce the stagger between the front and rear tires to reduce understeer.
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Last edited by thstone; 06-19-2019 at 05:47 PM.
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Old 06-19-2019, 05:46 PM   #3
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Yep, those are the stock sizes. Many sports cars have different sized tires front and rear.
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Old 06-19-2019, 06:21 PM   #4
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And in nominal terms 50% of the 205 mm section width is a 102.5 mm sidewall and 40% of 255 mm is a 102.0 mm sidewall. 45% of 225 mm is 101.25 mm. I say nominal because every tire manufacturer's sizes are a little different and the width of the rim the tire is mounted on also affects section width.
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Old 06-19-2019, 07:16 PM   #5
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Many that track or AX their cars go with the wider (225) front tire. For DD/street, the 205's are fine

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