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Originally Posted by lucky_topher
11" wide! 
i had those on my camaro with 335 tires
here's a good page:
http://wheeldynamics.net/appguide.html
Boxster:
Can use most wheels from the 996 with spacers in the rear. 40mm-65mm et front and 40-50mm et rear (Stock 18x10 is 47mm) the 18x10et 65mm 996 wheel will require a 15mm spacer to clear the shock.
Most extreme is the Techart 18x10.5 et 42mm wheel for the rear. Use zip ties for the parking brake cable. 285/30/18 tire is about the largest you can use.
Can use 19' from 987
Most extreme fit 20x9 et50mm and 20x10 et 60mm(15mm spacer) with 245/30/20 and 285/20/20
20x9et 50mm and 20x10et 60mm below
996:
On the 99-01 cars you can use up to 11" wide rears with an offset of 52mm. The factory 997 wheel in 19x11 offset 67mm will need a small spacer in the rear with some tires. The 2002 and up cars do not have this issue as the track was slightly widened. GT3 is 18x11 offset 63mm. |
Theres a chance they could also be 10x18 TT wheels, Someone on Renntech with a boxster has the 10x18s with 13mm spacers with out problems, even says he has room to spare. Lets hope the rears are 10x18 and not 11x18!