I run the 18" Carrera Lightweights on the street... in boxster ET... I run 275 toyo's in the rear. When I was researching these wheels, I was obviously looking for them in 986 ET, but they were hard to find. The 996 ET wheels have to have at least a 15mm spacer, and a good rule of thumb is stay under 275, although some people have run 285 if it is a narrow running tire type. I believe those that run 10" ~ET65 (996 size) rear wheels have to tie off the parking break line as well...
hope this helps
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