If I recall correctly, the '99 Boxster was offered with 16" wheels standard, with 17" as an option. Whether the suspension is designed for 18" or 19" wheels, I don't know. I've read that there was a subsequent change in suspension to support larger wheel sizes, referenced below.
However, if you move to an 18" wheel on a '99 Boxster, be prepared for a bumpier ride.
Here's information from a recent Rennlist post written by a very well-informed '02 Boxster owner:
"Lastly, IIRC 19" wheels/tires are *not* supported by Porsche on the pre-2000 cars. Starting in 2000 the cars received some changes to the chassis/running gear attachment points that supported the 19" wheels/tires and the bigger loads these subjected the car to.
My 02 came with 17" wheels/tires and I've driven a Cayman S with 18" wheels and my Turbo has 18" wheels and frankly/honestly 18" wheels is as big as I'd care to go.
Sincerely,
Macster"
Hope everything works out for you.
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Last edited by VGM911; 09-19-2010 at 12:36 PM.
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