this ruling went out about 3 years ago
ruling is now 1.25
ie:: r32 gtr stock runs 16 x 8 equates to 16x1.25 = 20 //// 8x1.25 = 10
therefore a r32 gtr can legally now run 20x10 rims
this was explained to me by Reno the head guy at welshpool pits when i got my gtr registered with 17x9's on it